Investigation of Intrinsic Activity of Cobalt and Iron Based Fischer-Tropsch Catalysts Using Transient Kinetic Methods

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Book Synopsis Investigation of Intrinsic Activity of Cobalt and Iron Based Fischer-Tropsch Catalysts Using Transient Kinetic Methods by : Alexandre Antônio Bento Carvalho

Download or read book Investigation of Intrinsic Activity of Cobalt and Iron Based Fischer-Tropsch Catalysts Using Transient Kinetic Methods written by Alexandre Antônio Bento Carvalho and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work exposed in this manuscript concerns the study of the intrinsic activity and localization of active sites in cobalt and iron based catalysts using a combination of transient kinetic methods such as SSITKA, extended physicochemical characterization and catalytic tests under quasi steady state conditions. Promotion of iron catalysts with metals used for soldering (Bi and Pb) results a remarkable increase in the light olefin production rate with the possibility to conduct Fischer-Tropsch synthesis at very mild reaction conditions (low pressure) and even at atmospheric pressure. Transient kinetic experiments showed facilitation of CO dissociation in the presence of promoters by scavenging O atoms from iron carbide. Cobalt catalyst supported by mordenite zeolite presented higher value of SSITKA rate constant. Localization of cobalt active sites in bifunctional cobalt-zeolite catalysts has a major impact on the reaction rate and in particular on the hydrocarbon selectivity. A proximity between the cobalt active site and Bronsted active sites was found to be a key parameter to obtain higher selectivity and yield of isomerized hydrocarbons. SSITKA combined with catalyst characterization revealed that carbon deposition and cobalt nanoparticle agglomeration were responsible for the deactivation of silica supported cobalt catalysts. Catalyst rejuvenation in hydrogen lessened the amounts of deposited carbon species and partially released the most active sites of carbon monoxide dissociative adsorption and stronger sites of carbon monoxide reversible adsorption.

Atomic-Scale Design of Iron Fischer-Tropsch Catalysts; A Combined Computational Chemistry, Experimental, and Microkinetic Modeling Approach

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Book Synopsis Atomic-Scale Design of Iron Fischer-Tropsch Catalysts; A Combined Computational Chemistry, Experimental, and Microkinetic Modeling Approach by :

Download or read book Atomic-Scale Design of Iron Fischer-Tropsch Catalysts; A Combined Computational Chemistry, Experimental, and Microkinetic Modeling Approach written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on (1) searching/summarizing published Fischer-Tropsch synthesis (FTS) mechanistic and kinetic studies of FTS reactions on iron catalysts; (2) preparation and characterization of unsupported iron catalysts with/without potassium/platinum promoters; (3) measurement of H2 and CO adsorption/dissociation kinetics on iron catalysts using transient methods; (3) analysis of the transient rate data to calculate kinetic parameters of early elementary steps in FTS; (4) construction of a microkinetic model of FTS on iron, and (5) validation of the model from collection of steady-state rate data for FTS on iron catalysts. Three unsupported iron catalysts and three alumina-supported iron catalysts were prepared by non-aqueous-evaporative deposition (NED) or aqueous impregnation (AI) and characterized by chemisorption, BET, temperature-programmed reduction (TPR), extent-of-reduction, XRD, and TEM methods. These catalysts, covering a wide range of dispersions and metal loadings, are well-reduced and relatively thermally stable up to 500-600 C in H2 and thus ideal for kinetic and mechanistic studies. Kinetic parameters for CO adsorption, CO dissociation, and surface carbon hydrogenation on these catalysts were determined from temperature-programmed desorption (TPD) of CO and temperature programmed surface hydrogenation (TPSR), temperature-programmed hydrogenation (TPH), and isothermal, transient hydrogenation (ITH). A microkinetic model was constructed for the early steps in FTS on polycrystalline iron from the kinetic parameters of elementary steps determined experimentally in this work and from literature values. Steady-state rate data were collected in a Berty reactor and used for validation of the microkinetic model. These rate data were fitted to 'smart' Langmuir-Hinshelwood rate expressions derived from a sequence of elementary steps and using a combination of fitted steady-state parameters and parameters specified from the transient measurements. The results provide a platform for further development of microkinetic models of FTS on Fe and a basis for more precise modeling of FTS activity of Fe catalysts. Calculations using periodic, self-consistent Density Functional Theory (DFT) methods were performed on various realistic models of industrial, Fe-based FTS catalysts. Close-packed, most stable Fe(110) facet was analyzed and subsequently carbide formation was found to be facile leading to the choice of the FeC(110) model representing a Fe facet with a sub-surface C atom. The Pt adatom (Fe{sup Pt}(110)) was found to be the most stable model for our studies into Pt promotion and finally the role of steps was elucidated by recourse to the defected Fe(211) facet. Binding Energies(BEs), preferred adsorption sites and geometries for all FTS relevant stable species and intermediates were evaluated on each model catalyst facet. A mechanistic model (comprising of 32 elementary steps involving 19 species) was constructed and each elementary step therein was fully characterized with respect to its thermochemistry and kinetics. Kinetic calculations involved evaluation of the Minimum Energy Pathways (MEPs) and activation energies (barriers) for each step. Vibrational frequencies were evaluated for the preferred adsorption configuration of each species with the aim of evaluating entropy-changes, pre exponential factors and serving as a useful connection with experimental surface science techniques. Comparative analysis among these four facets revealed important trends in their relative behavior and roles in FTS catalysis. Overall the First Principles Calculations afforded us a new insight into FTS catalysis on Fe and modified-Fe catalysts.

Iron and Cobalt Catalysts

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Publisher : MDPI
ISBN 13 : 303928388X
Total Pages : 414 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Iron and Cobalt Catalysts by : Wilson D. Shafer

Download or read book Iron and Cobalt Catalysts written by Wilson D. Shafer and published by MDPI. This book was released on 2020-06-23 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the turn of the last century when the field of catalysis was born, iron and cobalt have been key players in numerous catalysis processes. These metals, due to their ability to activate CO and CH, haev a major economic impact worldwide. Several industrial processes and synthetic routes use these metals: biomass-to-liquids (BTL), coal-to-liquids (CTL), natural gas-to-liquids (GTL), water-gas-shift, alcohol synthesis, alcohol steam reforming, polymerization processes, cross-coupling reactions, and photocatalyst activated reactions. A vast number of materials are produced from these processes, including oil, lubricants, waxes, diesel and jet fuels, hydrogen (e.g., fuel cell applications), gasoline, rubbers, plastics, alcohols, pharmaceuticals, agrochemicals, feed-stock chemicals, and other alternative materials. However, given the true complexities of the variables involved in these processes, many key mechanistic issues are still not fully defined or understood. This Special Issue of Catalysis will be a collaborative effort to combine current catalysis research on these metals from experimental and theoretical perspectives on both heterogeneous and homogeneous catalysts. We welcome contributions from the catalysis community on catalyst characterization, kinetics, reaction mechanism, reactor development, theoretical modeling, and surface science.

Bench-scale Studies of the Fischer-Tropsch Synthesis Over Iron, Nickel, and Nickel Cobalt Catalysts (Japan)

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ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Bench-scale Studies of the Fischer-Tropsch Synthesis Over Iron, Nickel, and Nickel Cobalt Catalysts (Japan) by : Shiro Watanabe

Download or read book Bench-scale Studies of the Fischer-Tropsch Synthesis Over Iron, Nickel, and Nickel Cobalt Catalysts (Japan) written by Shiro Watanabe and published by . This book was released on 1951 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Structure-activity-selectivity Relationships for Iron-based Catalysts in CO2 Fischer-Tropsch Synthesis

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Total Pages : 0 pages
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Book Synopsis Structure-activity-selectivity Relationships for Iron-based Catalysts in CO2 Fischer-Tropsch Synthesis by : Andrey Skrypnik

Download or read book Structure-activity-selectivity Relationships for Iron-based Catalysts in CO2 Fischer-Tropsch Synthesis written by Andrey Skrypnik and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was aimed to evaluate the fundamentals for the purposeful preparation of Fe-based catalysts for CO2 conversion to higher hydrocarbons (C2+-hcs) with suppressed methane production. To this end tailored catalyst preparation and sophisticated material characterization by state-of-the-art techniques were combined with spatially resolved steady-state and transient kinetic analyses. To determine factors governing catalytic performance, the evolution of the microstructure and the phase composition of as-prepared iron oxides under CO2 Fischer-Tropsch synthesis conditions were established.eng

Springer Handbook of Advanced Catalyst Characterization

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Publisher : Springer Nature
ISBN 13 : 3031071255
Total Pages : 1109 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Springer Handbook of Advanced Catalyst Characterization by : Israel E. Wachs

Download or read book Springer Handbook of Advanced Catalyst Characterization written by Israel E. Wachs and published by Springer Nature. This book was released on 2023-06-12 with total page 1109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Co-edited by world-renowned scientists in the field of catalysis, this book contains the cutting-edge in situ and operando spectroscopy characterization techniques operating under reaction conditions to determine a materials’ bulk, surface, and solution complex and their applications in the field of catalysis with emphasis on solid catalysts in powder form since such catalyst are relevant for industrial applications. The handbook covers from widely-used to cutting-edge techniques. The handbook is written for a broad audience of students and professionals who want to pursue the full capabilities available by the current state-of-the-art in characterization to fully understand how their catalysts really operate and guide the rational design of advanced catalysts. Individuals involved in catalysis research will be interested in this handbook because it contains a catalogue of cutting-edge methods employed in characterization of catalysts. These techniques find wide use in applications such as petroleum refining, chemical manufacture, natural gas conversion, pollution control, transportation, power generation, pharmaceuticals and food processing. fdsfds

Technology Development for Iron and Cobalt Fischer-Tropsch Catalysts

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ISBN 13 :
Total Pages : 83 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Technology Development for Iron and Cobalt Fischer-Tropsch Catalysts by :

Download or read book Technology Development for Iron and Cobalt Fischer-Tropsch Catalysts written by and published by . This book was released on 1999 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of deuterium on the Fischer-Tropsch (FT) synthesis was studied with a precipitated iron catalyst in the slurry phase. Deuterium has been used by several research groups to better understand the mechanism of CO hydrogenation. Inverse (k{sub H}/k{sub D} 1), normal (k{sub H}/k{sub D} 1) and no isotope effect (k{sub H}/k{sub D} = 1) have been reported. The conflicting results are thought to arise because rate of reaction is a combination of kinetic and equilibrium factors. In summary, the presence of boron produced only minor changes on the properties of the cobalt catalyst. In earlier studies, it was shown that the presence of boron made the catalyst less susceptible to poisoning by sulfur. Steady-state supercritical Fischer-Tropsch synthesis was studied in the work using a fixed-bed reactor and an unpromoted Co/SiO2 catalyst. This serves as the baseline for promoted catalyst studies. A pentane-hexane mixture was used as the supercritical solvent. Overall reactor pressure, syngas partial pressure and contact time were kept constant to obtain a valid comparison of the impact of solvent density in the catalytic activity and selectivity. Three different partial pressures of the mixture were chosen based on the density-pressure curve in order to investigate the pressure tuning effect to Fischer-Tropsch synthesis near critical region.

A Steady State Isotropic Transient Kinetic Analysis of the Fischer-Tropsch Synthesis Reaction Over a Cobalt Based Catalyst

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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (42 download)

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Book Synopsis A Steady State Isotropic Transient Kinetic Analysis of the Fischer-Tropsch Synthesis Reaction Over a Cobalt Based Catalyst by : H. A. J. Van Dijk

Download or read book A Steady State Isotropic Transient Kinetic Analysis of the Fischer-Tropsch Synthesis Reaction Over a Cobalt Based Catalyst written by H. A. J. Van Dijk and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Study of Fischer-Tropsch Synthesis Over Iron-based Catalysts Using a Well-stirred Slurry Reactor

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ISBN 13 :
Total Pages : 600 pages
Book Rating : 4.:/5 (29 download)

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Book Synopsis Study of Fischer-Tropsch Synthesis Over Iron-based Catalysts Using a Well-stirred Slurry Reactor by : Ronald Alan Dictor

Download or read book Study of Fischer-Tropsch Synthesis Over Iron-based Catalysts Using a Well-stirred Slurry Reactor written by Ronald Alan Dictor and published by . This book was released on 1984 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Fischer-Tropsch Reaction Over Ti-Modified Cobalt Catalysts

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.3/5 (799 download)

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Book Synopsis The Fischer-Tropsch Reaction Over Ti-Modified Cobalt Catalysts by : Andrew Ronald Raub

Download or read book The Fischer-Tropsch Reaction Over Ti-Modified Cobalt Catalysts written by Andrew Ronald Raub and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents research done to investigate the promoter effects of small amounts of titanium oxides (TiOx) on unsupported cobalt metal catalysts for the atmospheric pressure Fischer-Tropsch (CO+H2) reaction. It is known that cobalt catalysts with TiO2 supports can have their performance for the Fischer-Tropsch reaction enhanced due to interactions between cobalt metal and the support. Small TiOx species can migrate onto the surface of metal particles during reductive treatment, termed the "strong metal-support interaction" (SMSI). Interactions between TiOx species and the cobalt metal are expected to influence its catalytic behavior. Techniques were developed to create unsupported cobalt metal catalysts dosed with controlled amounts of TiOx via oxalate precursors. By eliminating the presence of a supporting material, interactions between cobalt metal and TiOx could be focused on. This is the first time that TiOx alone has been studied as a promoter species in controlled amounts over an unsupported cobalt catalyst for the atmospheric pressure CO+H2 reaction.Steady state and chemical transient kinetic (CTK) reaction studies revealed that very small amounts of Ti (~1-2 atom%, relative to cobalt) induce changes in the catalyst structure and product selectivity. The addition of TiOx to the cobalt resulted in increased selectivity toward alkenes and suppression of CH4 and C2H6 that persisted over long reaction times. When TiOx is present, CTK measurements revealed the presence of surface intermediates that are absent over pure cobalt and react with different kinetics to form chain lengthened hydrocarbons. Estimated carbon amounts on the catalyst surfaces showed ~3 carbon atoms/cobalt metal site for pure cobalt catalysts, and ~5-6 carbon atoms/cobalt metal site for Ti-modified cobalt catalysts. General observations made about formation and decay behavior for hydrocarbon products during CTK studies were in good agreement with those obtained for similar work done on CoMgO and CoMnOx catalysts. Suggestions for the direction of future work on Ti-modified cobalt catalysts are made at the end of this dissertation.Some effort has also been spent on using methyl formate, which can be considered a liquid form of syngas, to produce chain lengthened hydrocarbons using CoMnTi catalysts. This ternary catalyst composition was selected due to its industrial relevance. Some transient kinetic studies were performed but turned out challenging to interpret due to the complexity of parallel decomposition pathways for methyl formate. In view of the complexity of the CoMnTi catalyst composition, it was deemed important to first focus on the CoTi case as a prerequisite for studying more complicated catalyst formulations.

Elucidating the CO Hydrogenation Mechanism Over Cobalt Based Catalysts Using Chemical Transient Kinetics

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ISBN 13 :
Total Pages : 207 pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis Elucidating the CO Hydrogenation Mechanism Over Cobalt Based Catalysts Using Chemical Transient Kinetics by : Motahare Athariboroujeny

Download or read book Elucidating the CO Hydrogenation Mechanism Over Cobalt Based Catalysts Using Chemical Transient Kinetics written by Motahare Athariboroujeny and published by . This book was released on 2019 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents research performed to advance the fundamental knowledge of the mechanism of the catalytic CO hydrogenation according to the Fischer-Tropsch synthesis. Despite extensive studies on the reaction mechanism, a detailed understanding of the relevant steps is still lacking. Quantitative Chemical Transient Kinetics (CTK) informs us of how the reaction proceeds while the catalytically active phase is being built up. Among the proposed mechanisms, C-C coupling and CO-insertion remain the two main suggested mechanisms. The present work scrutinizes which of these suggestions are compatible with the CTK evidence.We illustrate the importance of surface coverage and support effects. Important mechanistic information is obtained from delay time analysis of the products relative to that of the reactants, provided by CTK. We show that the activated Co/MnOx surface does not provide metallic sites under steady-state conditions. A CO-insertion mechanism occurs at high coverages, while at lower coverages C-C coupling between CHx species can occur. The chemical nature along with the surface coverages yet depend on the H2/CO ratio. For low such ratios, the CO-insertion mechanism dominates, involving formate-derived surface species. Specifically, CO hydrogenation towards methane at different H2/CO ratios shows that two mechanisms co-exist; hydrogenation of formate species when the surface is covered and CHx hydrogenation when the surface still provides metallic sites. Microscopy (TEM) and spectroscopy (XPS) analyses support the CTK conclusions. Some carbon can penetrate the Co surface and induce cobalt carbide formation. We performed CTK analyses with pure Co and Co/TiOx, for comparison purposes. The catalytically active surface is shown to be different for these catalysts. We also compare CTK results of the CO hydrogenation with those of methyl formate (MF) hydrogenation. MF is selected as it contains a formate group and forms methoxy during dissociative adsorption on the surface. Such methoxy species are claimed to be important during Fischer-Tropsch synthesis. CTK studies of the support influence are particularly revealing for Co/SiO2 catalysts. Different from all other catalysts addressed here, the surface coverages over Co/SiO2 do not exceed one monolayer capacity. The impact of this finding regarding the reaction mechanism is still to be explored in future work.

Fischer-Tropsch Synthesis Over Cobalt Catalysts

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ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (167 download)

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Book Synopsis Fischer-Tropsch Synthesis Over Cobalt Catalysts by : Xuezhi Zhang

Download or read book Fischer-Tropsch Synthesis Over Cobalt Catalysts written by Xuezhi Zhang and published by . This book was released on 1985 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Design, Synthesis, and Mechanistic Evaluation of Iron-Based Catalysis for Synthesis Gas Conversion to Fuels and Chemicals

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Design, Synthesis, and Mechanistic Evaluation of Iron-Based Catalysis for Synthesis Gas Conversion to Fuels and Chemicals by : Enrique Iglesia

Download or read book Design, Synthesis, and Mechanistic Evaluation of Iron-Based Catalysis for Synthesis Gas Conversion to Fuels and Chemicals written by Enrique Iglesia and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project explores the extension of previously discovered Fe-based catalysts with unprecedented Fischer-Tropsch synthesis rate, selectivity, and ability to convert hydrogen-poor synthesis gas streams typical of those produced from coal and biomass sources. Contract negotiations were completed on December 9, 2004. During the first reporting period, we certified a microreactor, installed required analytical equipment, and reproduced synthetic protocols and catalytic performance previously reported. During this second reporting period, we have prepared and tested several Fe-based compositions for Fischer-Tropsch synthesis and tested the effects of product recycle under both subcritical and supercritical conditions. These studies established modest improvements in rates and selectivities with light hydrocarbon recycle without any observed deleterious effects, opening up the opportunities for using of recycle strategies to control temperature profiles in fixed-bed Fe-based Fischer-Tropsch synthesis reactors without any detectable kinetic detriment. In a parallel study, we examined similar effects of recycle for cobalt-based catalysts; marked selectivity improvements were observed as a result of the removal of significant transport restrictions on these catalysts. Finally, we have re-examined some previously unanalyzed data dealing with the mechanism of the Fischer-Tropsch synthesis, specifically kinetic isotope effects on the rate and selectivity of chain growth reactions on Fe-based catalysts.

Natural Gas Conversion V

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Publisher : Elsevier
ISBN 13 : 0080537308
Total Pages : 1005 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Natural Gas Conversion V by : A. Parmaliana

Download or read book Natural Gas Conversion V written by A. Parmaliana and published by Elsevier. This book was released on 1998-09-17 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: On January 1988, the ascertained and economically accessible reserves of Natural Gas (NG) amounted to over 144,000 billion cubic meters worldwide, corresponding to 124 billion tons of oil equivalents (comparable with the liquid oil reserves, which are estimated to be 138 billion TOE). It is hypothesized that the volume of NG reserve will continue to grow at the same rate of the last decade. Forecasts on production indicate a potential increase from about 2,000 billion cubic meters in 1990 to not more than 3,300 billion cubic meters in 2010, even in a high economic development scenario. NG consumption represents only one half of oil: 1.9 billion TOE/y as compared to 3.5 of oil. Consequently, in the future gas will exceed oil as a carbon atom source. In the future the potential for getting energetic vectors or petrochemicals from NG will continue to grow. The topics covered in Natural Gas Conversion V reflect the large global R&D effort to look for new and economic ways of NG exploitation. These range from the direct conversion of methane and light paraffins to the indirect conversion through synthesis gas to fuels and chemicals. Particularly underlined and visible are the technologies already commercially viable. These proceedings prove that mature and technologically feasible processes for natural gas conversion are already available and that new and improved catalytic approaches are currently developing, the validity and feasibility of which will soon be documented. This is an exciting area of modern catalysis, which will certainly open novel and rewarding perspectives for the chemical, energy and petrochemical industries.

Effect of Alumina Support Modification on Performance of Cobalt and Iron Catalysts in Fischer-tropsch Reaction

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ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.:/5 (921 download)

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Book Synopsis Effect of Alumina Support Modification on Performance of Cobalt and Iron Catalysts in Fischer-tropsch Reaction by :

Download or read book Effect of Alumina Support Modification on Performance of Cobalt and Iron Catalysts in Fischer-tropsch Reaction written by and published by . This book was released on 2006 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effect of alumina support modification for applications as cobalt and iron catalyst supports in Fischer-Tropsch reaction were studied. Alumina supports consisting of various gamma to chi ratios were prepared using solvothermal method and employed as supports for cobalt catalysts. In order to identify the characteristics, all the catalysts were characterized using surface area analysis, X-ray diffraction (XRD), Scanning electron microscopy2Energy dispersive X-ray (SEM/EDX), Transmission electron microscopy (TEM), Fourier transform Infrared Spectroscopy (FT-IR), Temperature programmed reduction (TPR), and hydrogen and carbon monoxide chemisorption. CO hydrogenation (H 2CO = 10/1) was also performed to determine the overall activity and selectivity of the Co/AL O catalysts containing various gamma to chi ratios. It was found that both activity and selectivity were increased with increasing the chi to gamma ratios of the alumina supports. It is suggested that the spherical;-shape like morphology of the -phase AL O provide better stability and dispersion of the Co particles. In addition, the effect of Cu-modification of alumina support for applications as iron catalyst supports in Fischer-Tropsch reaction (H 2CO - 2/1) was also investigated. It was found that the use of copper-modified alumina supports enhanced both reducibilities and the overall activities of Fe/AL O catalysts. However, Cu-modification of alumina support appeared to have no effect on selectivity of the F-T products.

Technology Development for Iron Fischer-Tropsch Catalysis. Quarterly Technical Progress Report, October--December, 1994

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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Technology Development for Iron Fischer-Tropsch Catalysis. Quarterly Technical Progress Report, October--December, 1994 by :

Download or read book Technology Development for Iron Fischer-Tropsch Catalysis. Quarterly Technical Progress Report, October--December, 1994 written by and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fischer-Tropsch catalysts must undergo a pretreatment in order to be active. As part of the authors comprehensive study to maximize the activity of iron based precipitated Fischer-Tropsch catalysts, they are currently attempting to optimize the activation procedure. Although they are able to achieve high activity using CO pretreatment, the catalysts tend to deactivate suddenly and rapidly after 500 hr of synthesis. Kolbel reports high CO conversion comparable to these results at a lower gas flow (2.4 vs. 3.4 nL/hr-g(Fe)); however, he achieved greater stability with conversions reported to be 90% after 1,400 hrs. One possibility for Kolbel's higher stability could be due to the activation procedure. Herein are reported the initial results of a study to optimize the catalyst composition and the operating conditions for the iron based slurry phase Fischer-Tropsch synthesis when synthesis gas activation is utilized.

Development of Novel Iron and Cobalt-based Fischer Tropsch Catalysts

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (935 download)

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Book Synopsis Development of Novel Iron and Cobalt-based Fischer Tropsch Catalysts by : Melanie Minnermann

Download or read book Development of Novel Iron and Cobalt-based Fischer Tropsch Catalysts written by Melanie Minnermann and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: