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Fischer Tropsch Cobalt Catalyst Improvements With The Presence Of Tio2 La2o3 And Zro2 On An Alumina Support
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781719501361 Total Pages :100 pages Book Rating :4.5/5 (13 download)
Book Synopsis Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of TiO2, La2O3, and ZrO2 on an Alumina Support by : National Aeronautics and Space Administration (NASA)
Download or read book Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of TiO2, La2O3, and ZrO2 on an Alumina Support written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to evaluate the effect of titanium oxide, lanthanum oxide, and zirconium oxide on alumina supported cobalt catalysts. The hypothesis was that the presence of lanthanum oxide, titanium oxide, and zirconium oxide would reduce the interaction between cobalt and the alumina support. This was of interest because an optimized weakened interaction could lead to the most advantageous cobalt dispersion, particle size, and reducibility. The presence of these oxides on the support were investigated using a wide range of characterization techniques such as SEM, nitrogen adsorption, x-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed reduction after reduction (TPR-AR), and hydrogen chemisorptions/pulse reoxidation. Results indicated that both La2O3 and TiO2 doped supports facilitated the reduction of cobalt oxide species in reference to pure alumina supported cobalt catalysts, however further investigation is needed to determine the effect of ZrO2 on the reduction profile. Results showed an increased corrected cluster size for all three doped supported catalysts in comparison to their reference catalysts. The increase in reduction and an increase in the cluster size led to the conclusion that the support-metal interaction weakened by the addition of TiO2 and La2O3. It is also likely that the interaction decreased upon presence of ZrO2 on the alumina, but further research is necessary. Preliminary results have indicated that the alumina-supported catalysts with titanium oxide and lanthanum oxide present are of interest because of the weakened cobalt support interaction. These catalysts showed an increased extent of reduction, therefore more metallic cobalt is present on the support. However, whether or not there is more cobalt available to participate in the Fischer-Tropsch synthesis reaction (cobalt surface atoms) depends also on the cluster size. On one hand, increasing cluster size alone tends to decrease the
Book Synopsis Fischer-Tropsch cobalt catalyst improvements with the presence of TiO2, La2O3, and ZrO2 on an alumina support by : Jennifer Lindsey Suder Klettlinger
Download or read book Fischer-Tropsch cobalt catalyst improvements with the presence of TiO2, La2O3, and ZrO2 on an alumina support written by Jennifer Lindsey Suder Klettlinger and published by . This book was released on 2012 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of Tio2, La2o3, and Zro2 on an Alumina Support by : Nasa Technical Reports Server (Ntrs)
Download or read book Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of Tio2, La2o3, and Zro2 on an Alumina Support written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Book Synopsis Fischer-Tropsch Activity for Non-promoted Cobalt-on-alumina Catalysts by :
Download or read book Fischer-Tropsch Activity for Non-promoted Cobalt-on-alumina Catalysts written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cobalt catalysts, and processes employing these inventive catalysts, for hydrocarbon synthesis. The inventive catalyst comprises cobalt on an alumina support and is not promoted with any noble or near noble metals. In one aspect of the invention, the alumina support preferably includes a dopant in an amount effective for increasing the activity of the inventive catalyst. The dopant is preferably a titanium dopant. In another aspect of the invention, the cobalt catalyst is preferably reduced in the presence of hydrogen at a water vapor partial pressure effective to increase the activity of the cobalt catalyst for hydrocarbon synthesis. The water vapor partial pressure is preferably in the range of from 0 to about 0.1 atmospheres.
Book Synopsis Studying the Fischer-Tropsch Synthesis on Alumina Support Cobalt Base Catalyst in Fixed Bed Reactor by : Adnan Khalil Oues
Download or read book Studying the Fischer-Tropsch Synthesis on Alumina Support Cobalt Base Catalyst in Fixed Bed Reactor written by Adnan Khalil Oues and published by . This book was released on 2013 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Fischer-Tropsch catalyst composed of cobalt supported on alumina was prepared. This catalyst was cobalt/alumina (Co/AL2 O3 ). The physical characterization of the catalyst was conducted using surface area analysis through the BET method, and particle size analysis. Fischer-Tropsch experiments were conducted in a fixed bed reactor. A flow rate of 100sml/min was selected based experimentally. Two temperatures were 330, and 350°C, and three different pressures as follows 145, 217.6, and 290 psig. The results were evaluated and studied based on conversion of hydrogen and carbon monoxide, in addition to selectivity of products.
Book Synopsis A Kinetic Study of the Modified Fischer-Tropsch Synthesis Over an Alumina-supported Cobalt Oxide Catalyst by : Danny Chien Lu
Download or read book A Kinetic Study of the Modified Fischer-Tropsch Synthesis Over an Alumina-supported Cobalt Oxide Catalyst written by Danny Chien Lu and published by . This book was released on 1985 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Role of Alumina Support in Cobalt Fischer-Tropsch Synthesis by : Øyvind Borg
Download or read book Role of Alumina Support in Cobalt Fischer-Tropsch Synthesis written by Øyvind Borg and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fischer-Tropsch Reaction Over Alumina-supported Cobalt Catalyst by : Phathutshedzo Rodney Khangale
Download or read book Fischer-Tropsch Reaction Over Alumina-supported Cobalt Catalyst written by Phathutshedzo Rodney Khangale and published by . This book was released on 2016 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book תרנן לשוני written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Utilization of Cobalt Catalyst for High Temperature Fischer-Tropsch Synthesis in a Fluidized Bed Reactor by : James C. Mabry
Download or read book Utilization of Cobalt Catalyst for High Temperature Fischer-Tropsch Synthesis in a Fluidized Bed Reactor written by James C. Mabry and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research determined that the improved heat transfer characteristics of a fluidized bed reactor (FBR) will allow the use of cobalt catalyst for high temperature Fischer-Tropsch synthesis (HTFT). Cobalt was loaded onto a gamma alumina support, the catalyst was characterized using TPR, BET/BJH, XRD, and PSA to track changes in the catalyst morphology. The reactor was characterized to determine the minimum fluidization velocity and the maximum velocity prior to entering lean phase fluidization with pneumatic transport of the catalyst. The highest minimum fluidization velocity was found to be about 2800 sccm, there was no maximum velocity found for the reactor setup. Once characterized, the reactor was operated at pressures of 145, 217.6, and 290.1 psig, a syngas flow rate of 4000 sccm, and at temperatures of 330 and 350°C. The optimal conditions found in this study were 330°C and 217 psig. At these conditions CO conversion was 83.53% for a single pass. Methane, CO 2 , and light gases (C2-C4) selectivities were at low rates of 31.43, 5.80, and 3.48 % respectively. Alcohol selectivity at these conditions was non-existent. The olefin and wax selectivities were the lowest of the data set at 7.05 and 3.18% respectively. Liquid transportation fuels selectivity was the highest at 56.11%.
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.
Download or read book Fischer-Tropsch Synthesis written by and published by . This book was released on 2016 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of ammonia in syngas on the performance of various supported cobalt catalysts (i.e., Al2O3, TiO2 and SiO2) was investigated during Fischer-Tropsch synthesis (FTS) using a continuously stirred tank reactor (CSTR). The addition of ammonia (10 ppmv NH3) caused a significant deactivation for all supported cobalt catalysts, but the rate of deactivation was higher for the silica-supported catalysts relative to the alumina and titania-supported catalysts used in this work. Ammonia addition had a positive effect on product selectivity (i.e., lower light gas products and higher C5+) for alumina and titania-supported catalysts compared to ammonia free conditions, whereas, the addition of ammonia increased lighter hydrocarbon (C1-C4) products and decreased higher hydrocarbon (C5+) selectivity compared to ammonia-free synthesis conditions for the silica-supported catalyst. For alumina and titania-supported catalysts, the activity almost recovered with mild in-situ hydrogen treatment of the ammonia exposed catalysts. For the silica-supported catalyst, the loss of activity is somewhat irreversible (i.e., cannot be regained after the mild hydrogen treatment). Addition of ammonia led to a significant loss in BET surface area and changes in pore diameter (consistent with pore collapse of a fraction of pores into the microporous range as described in the literature), as well as formation of catalytically inactive cobalt support compounds for the silica-supported catalyst. On the other hand, the pore characteristics of alumina and titania-supported catalysts were not significantly changed. In conclusion, XANES results of the ammonia exposed silica-supported catalysts further confirm the formation of cobalt-support compounds (cobalt silicates).
Book Synopsis Cobalt on Tungsten Modified Alumina Supports in Relation to Fischer-Tropsch Catalysis by : Stuart James Thomson
Download or read book Cobalt on Tungsten Modified Alumina Supports in Relation to Fischer-Tropsch Catalysis written by Stuart James Thomson and published by . This book was released on 1993 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cobalt Fischer-Tropsch Catalysts Having Improved Selectivity by :
Download or read book Cobalt Fischer-Tropsch Catalysts Having Improved Selectivity written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A cobalt Fischer-Tropsch catalyst having an improved steam treated, acid extracted LZ-210 support is taught. The new catalyst system demonstrates improved product selectivity at Fischer-Tropsch reaction conditions evidenced by lower methane production, higher C.sub. 5.sup.+ yield and increased olefin production.
Book Synopsis Synthesis and Characterization of Cobalt Supported TiO2 with Mn/Zn/Zr Promoters for Fischer Tropsch Synthesis by : Mohamad Firdaus Mohamad Ghazali
Download or read book Synthesis and Characterization of Cobalt Supported TiO2 with Mn/Zn/Zr Promoters for Fischer Tropsch Synthesis written by Mohamad Firdaus Mohamad Ghazali and published by . This book was released on 2012 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research about the synthesis and characterization cobalt supported TiO2 catalyst for Fischer-Tropsch synthesis (FTS) producing clean and best fuel. In variety of type of promoters, the effect is determined. The catalytic material will be prepared by impregnation of a mesoporous molecular sieve based on silica which is TiO2 as cobalt catalytic supporters and Zn/Zr/Mn as promoters for comparison purposes. All materials will be used characterizing by several physico-chemical techniques such as SEM, , TGA, FTIR. The catalytic and characterization results achieve give a great influence of mesoporous support porosity on the structure, reducibility and Fischer-Tropsch synthesis catalytic behavior of cobalt oxide species supported over these ordered materials. The size of supported cobalt oxide species formed during the calcination step increased with the average pore size (Dp) of the mesoporous support. Thus, the catalyst with larger Co oxide species located in wide pore silica showed to be easily reducible, more active and very selective toward the fuel fraction. The additional of promoters will be used to increase the performances of Fischer-Tropsch synthesis.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
