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Author : Hiba Annous
Publisher :
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (11 download)
Download or read book Dry Reforming of Methane on Mesoporous Ceria Based Catalysts Prepared by Hard Template Method written by Hiba Annous and published by . This book was released on 2016 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leila Karam
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (123 download)
Download or read book New Routes of Preparation of Active and Stable Mesoporous Ni-alumina Based Catalysts for Methane Dry Reforming and CO2 Methanation written by Leila Karam and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dry reforming of methane (DRM) is a process that converts CH4 and CO2 gases into syngas, a gaseous mixture of H2 and CO. Ni based catalysts proved to be suitable for the reaction due to their good activity, wider availability and lower cost than noble-based materials. However, these catalysts are not stable due to Ni sintering and coke deposition. In this thesis we developed two different synthesis routes of mesoporous Ni-Al2O3 based catalysts that can occlude Ni inside the pores achieving high activity and stability in DRM. A set of complimentary physicochemical techniques was systematically applied to thoroughly investigate the materials properties at all steps of preparation and activation. The first approach embraces synthesis of mesoporous Ni-Mg-Al2O3 materials by one-pot EISA strategy. Results demonstrate that 15 wt% Mg (optimum loading) based sample contribute to high and homogenous dispersion of both Ni and Mg, preserving ordered mesoporous Al2O3 walls. The good structural and textural characteristics in addition to the enhanced basicity reinforce activity and stability. The second method involves synthesizing new mesoporous Ni-Al2O3 materials using metal-organic framework as sacrificial template. This procedure results in small Ni nanoparticles homogeneously dispersed and stabilized within the high surface area support resisting sintering and inhibiting carbon nanotubes formation during reforming reaction. Based on catalytic tests completed by thermodynamics calculations, the synthesized materials proved to be eficient not only for dry reforming of methane, but also for CO2 methanation reaction and dry reforming of waste pyrolysis products.
Author : Marie-Nour Kaydouh
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.:/5 (11 download)
Download or read book Preparation, Characterization and Reactivity of NI-CE/SBA-15 Catalysts in Dry Reforming of Methane written by Marie-Nour Kaydouh and published by . This book was released on 2013 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charbel Harika
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (113 download)
Download or read book Effect of Pretreatment Conditions on Catalytic Performances of Mesoporous Ni5/SBA-15 Catalyst in Methane Dry Reforming written by Charbel Harika and published by . This book was released on 2017 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers have been studying dry reforming of methane (DRM) to produce syngas, a mixture of hydrogen and carbon monoxide, from methane and carbon dioxide. In this study, catalysts containing 5% wt Ni dispersed on SBA-15 support were prepared by "two solvent impregnation" method. Without prior calcination, three samples were pretreated by reduction under different atmospheres (H2/Ar, N2, Ar) at 450°C with a heating rate of 0.5°C/min. Two other samples were reduced under H2/Ar but at different temperatures and heating rates (650°C with 10°C/min, and 450°C with 0.5°C/min). After the catalysts characterization (N2 sorption, XRD and TPR) and the catalytic tests (activity and stability), Ni5/SBA-15(U-H2) (reduced under H2/Ar at 450°C with a heating rate 0.5°C/min) showed the best catalytic performance among the other catalysts studied. The behavior of Ni5/SBA-15(U-H2) is close to the behavior of Ni5/SBA-15 calcined at 450°C with a heating rate 0.5°C/min.
Author : Inamuddin
Publisher : Springer Nature
ISBN 13 : 3030728773
Total Pages : 354 pages
Book Rating : 4.0/5 (37 download)
Download or read book Carbon Dioxide Utilization to Sustainable Energy and Fuels written by Inamuddin and published by Springer Nature. This book was released on 2021-11-30 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book provides an in-depth overview of carbon dioxide (CO2) transformations to sustainable power technologies. It also discusses the wide scope of issues in engineering avenues, key designs, device fabrication, characterizations, various types of conversions and related topics. It includes studies focusing on the applications in catalysis, energy conversion and conversion technologies, etc. This is a unique reference guide, and one of the detailed works is on this technology. The book is the result of commitments by leading researchers from various backgrounds and expertise. The book is well structured and is an essential resource for scientists, undergraduate, postgraduate students, faculty, R&D professionals, energy chemists and industrial experts.
Author : Leila Karam
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (11 download)
Download or read book Calcination Control for Enhanced Kinetics of Methane Dry Reforming on Mesoporous Ni/SBA-15 Based Catalysts written by Leila Karam and published by . This book was released on 2016 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : An-Hui Lu
Publisher : Royal Society of Chemistry
ISBN 13 : 0854041885
Total Pages : 279 pages
Book Rating : 4.8/5 (54 download)
Download or read book Nanocasting written by An-Hui Lu and published by Royal Society of Chemistry. This book was released on 2010 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials with tailored properties are regarded as a fundamental element in the development of future science and technology. Research is still ongoing into the nanosized construction elements required to create functional solids. The recently developed technique, nanocasting, has great advantage over others in terms of the synthesis of special nanostructured materials by the careful choice of suitable elements and nanoengineering steps. This new book summarizes the recent developments in nanocasting, including the principles of nanocasting, syntheses of novel nanostructured materials, characterization methods, detailed synthetic recipes and further possible development in this area. The book focuses on the synthesis of porous solids from the viewpoint of methodology and introduces the science of nanocasting from fundamental principles to their use in synthesis of various materials. It starts by outlining the principles of nanocasting, requirements to the templates and precursors and the tools needed to probe matter at the nanoscale level. It describes how to synthesize nano structured porous solids with defined characteristics and finally discusses the functionalization and application of porous solids. Special attention is given to new developments in this field and future perspectives. A useful appendix covering the detailed synthetic recipes of various templates including porous silica, porous carbon and colloidal spheres is included which will be invaluable to researchers wanting to follow and reproduce nanocast materials. Topics covered in the book include: * inorganic chemistry * organic chemistry * solution chemistry * sol-gel and interface science * acid-base equilibria * electrochemistry * biochemistry * confined synthesis The book gives readers not only an overview of nanocasting technology, but also sufficient information and knowledge for those wanting to prepare various nanostructured materials without needing to search the available literature.
Author : Ye Wang
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Download or read book Reforming of Methane Over Ni-based Catalyst written by Ye Wang and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dry reforming of methane represents an attractive way to the conversion of two greenhouse gases (CO2 and CH4) into valuable products. Transition metal Ni is universally considered as an alternative to noble metal for DRM, due to its high activity and low cost. However, Ni-based catalysts suffered deactivation resulted from sintering of the active phase and carbon deposition, thus its practical application is not actually possible. So, there is a need to develop a cost-effective catalyst, able to withstand high temperatures and able to resist deactivation.First, the Ni-Zr catalysts were prepared by the one step urea hydrolysis method and were evaluated on the dry reforming of methane. Secondly, different promoters (such as Y, Al, Mn, and Mg) with Ni-Zr were co-synthesized by the same method (urea hydrolysis). The relationship between performance and structure is analyzed by activity test and multiple characterizations, such as BET, XRD, H2-TPR, CO2-TPD, TEM, XPS and Raman. Among them, the Y-modified catalysts improved the resistance to carbon deposition by increasing the weak and medium-strength basic sites. Also, the presence of Al could enhance the catalytic performance due to larger pore volume and diameter after aluminum introduction. The addition of Mn led to the increase of the catalytic activity with time on stream because of a more stable structure of ZrO2 species and a redistribution of nickel species.Thus, the choices of different promoters result in diversification in the specific surface area, Ni0 crystallite size, and basicity, which may further affect the catalytic performance of prepared catalysts.
Author : Ali khansa
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (11 download)
Download or read book Dry Reforming of Methane on Promoted (LA, MG, and RH) NI Based Catalyst Supported on Commercial Silica written by Ali khansa and published by . This book was released on 2014 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ai Sheng
Publisher : CRC Press
ISBN 13 : 113802645X
Total Pages : 638 pages
Book Rating : 4.1/5 (38 download)
Download or read book Manufacturing and Engineering Technology (ICMET 2014) written by Ai Sheng and published by CRC Press. This book was released on 2014-11-24 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manufacturing and Engineering Technology brings together around 200 peer-reviewed papers presented at the 2014 International Conference on Manufacturing and Engineering Technology, held in San-ya, China, October 17-19, 2014. The main objective of these proceedings is to take the Manufacturing and Engineering Technology discussion a step further. Contributions cover Manufacture, Mechanical, Materials Science, Industrial Engineering, Control, Information and Computer Engineering. Furthermore, these proceedings provide a platform for researchers, engineers, academics as well as industrial professionals from all over the world to present their research results and development activities in Manufacturing Science and Engineering Technology.
Author : Jun Shen
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (136 download)
Download or read book In Situ Characterization During the Synthesis and Reaction of Ceria-based Mesoporous Catalysts for NH3-selective Catalytic Reduction (SCR) Applications written by Jun Shen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nikolaos Pegios
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (11 download)
Download or read book Ni-based Catalysts for the Dry Reforming of Methane written by Nikolaos Pegios and published by . This book was released on 2018* with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Di Nardo
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (883 download)
Download or read book Mesoporous Ceria Catalyst Synthesis written by Thomas Di Nardo and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work takes a closer look at ceria catalyst synthesis through micelle self-assembly. We compare surfactants, precursors, solvent systems, and doping. The surfactants are the building blocks upon which the ceria can crystallize. The samples are calcinated to test their thermal stability. Characterization is performed using pXRD as well as physisorption. The samples that exhibited a higher thermal stability were characterized to have a high surface area as well as low fluctuations in crystallite size, pore volume, and pore size. Ceria synthesized with cerium (III) nitrate hexahydrate and CTAB in a water:ethanol mixture using sodium hydroxide showed to be the most effective at providing a thermally stable product. Doping the catalyst with titanium increased the thermal stability significantly. Select samples were run in a variety of fuel to oxygen ratios to determine the best conditions in which we could perform partial methane oxidation to recuperate hydrogen gas. Most of the experiments show oxygen depletion with minor changes in other gas levels indicating that there is no oxidation occurring. Curiously the oxygen levels do decrease. There is a possibility that there is a reaction occurring initially at room temperature and being exacerbated with further temperature increase.
Author : Jens Hagen
Publisher : John Wiley & Sons
ISBN 13 : 3527331654
Total Pages : 546 pages
Book Rating : 4.5/5 (273 download)
Download or read book Industrial Catalysis written by Jens Hagen and published by John Wiley & Sons. This book was released on 2015-11-02 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in it's 3rd Edition, Industrial Catalysis offers all relevant information on catalytic processes in industry, including many recent examples. Perfectly suited for self-study, it is the ideal companion for scientists who want to get into the field or refresh existing knowledge. The updated edition covers the full range of industrial aspects, from catalyst development and testing to process examples and catalyst recycling. The book is characterized by its practical relevance, expressed by a selection of over 40 examples of catalytic processes in industry. In addition, new chapters on catalytic processes with renewable materials and polymerization catalysis have been included. Existing chapters have been carefully revised and supported by new subchapters, for example, on metathesis reactions, refinery processes, petrochemistry and new reactor concepts. "I found the book accesible, readable and interesting - both as a refresher and as an introduction to new topics - and a convenient first reference on current industrial catalytic practise and processes." Excerpt from a book review for the second edition by P. C. H. Mitchell, Applied Organometallic Chemistry (2007)
Author : Abdulkader Albarazi
Publisher :
ISBN 13 :
Total Pages : 169 pages
Book Rating : 4.:/5 (894 download)
Download or read book Development of Ni-based Catalysts for Methane Dry Reforming Application written by Abdulkader Albarazi and published by . This book was released on 2013 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rothman Yu-Fai Kam
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Catalyst Development for Dry Reforming of Methane and Low-temperature Water-gas Shift Reaction written by Rothman Yu-Fai Kam and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Both dry reforming of methane (DRM) and low-temperature water-gas shift (LT-WGS) processes can be integrated into a fuel cell plant and are utilised for the production of hydrogen as an important energy source for fuel cells. Improvement of current catalytic systems, and identification and development of alternative catalysts for DRM and LT-WGS reactions have formed the basis of this study. In the first stage of the work, the influence of WO3 on a Pt/CeO2 catalyst was investigated for the dry reforming of methane. It was found that Pt/CeO2 catalysts loaded with WO3 at 10 mol% to 20 mol% were very stable during 20 hours of dry reforming of methane operation in comparison to a commercial Ni catalyst. However further addition of WO3 (>70%) promoted coking on the Pt/CeO2 sample, ultimately leading to catalyst deactivation. It was also desirable to develop catalysts with higher activity to reduce operating cost, thus the physicochemical properties of different materials were assessed to identify parameters important for LT-WGS activity. Copper catalysts on metal oxide support (CeO2, ZnO, TiO2, SiO2, Al2O3, ZrO2, MgO and SnO2) were screened, while characterisation showed the catalyst adsorbing H2O and CO was crucial in generating LT-WGS activity, with Cu/ZnO attaining the highest LT-WGS activity. Lanthanum (La) was known to have high affinity for H2O, hence the effects of La doping on Cu/ZnO catalysts for use in LT-WGS reaction was investigated. The findings indicated the La promoter improved activity at a loading of 2.3 wt%, above which the activity significantly decreased. A systematic investigation has also been conducted on the effects of oxygen introduction on the Cu-based and Pt-based catalysts during LT-WGS operation with particular attention on the pyrophoricity (i.e. vulnerability to oxidative sintering) of the catalysts, and the impacts on key material characteristics. The objective was to examine whether the catalysts were suitable for fuel cell applications. It was observed that the Cu-based catalysts were pyrophoric and therefore not a suitable catalyst. No pyrophoricity was observed for Pt-based catalysts. Pt/CeO2 was the only catalyst that retained its activity, displaying no loss in specific surface area or metal dispersion throughout the entire process, rendering it a suitable candidate for fuel cell systems.
Author : Tomas Ramirez Reina
Publisher : John Wiley & Sons
ISBN 13 : 3527346392
Total Pages : 498 pages
Book Rating : 4.5/5 (273 download)
Download or read book Engineering Solutions for CO2 Conversion written by Tomas Ramirez Reina and published by John Wiley & Sons. This book was released on 2021-07-19 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive guide that offers a review of the current technologies that tackle CO2 emissions The race to reduce CO2 emissions continues to be an urgent global challenge. "Engineering Solutions for CO2 Conversion" offers a thorough guide to the most current technologies designed to mitigate CO2 emissions ranging from CO2 capture to CO2 utilization approaches. With contributions from an international panel representing a wide range of expertise, this book contains a multidisciplinary toolkit that covers the myriad aspects of CO2 conversion strategies. Comprehensive in scope, it explores the chemical, physical, engineering and economical facets of CO2 conversion. "Engineering Solutions for CO2 Conversion" explores a broad range of topics including linking CFD and process simulations, membranes technologies for efficient CO2 capture-conversion, biogas sweetening technologies, plasma-assisted conversion of CO2, and much more. This important resource: * Addresses a pressing concern of global environmental damage, caused by the greenhouse gases emissions from fossil fuels * Contains a review of the most current developments on the various aspects of CO2 capture and utilization strategies * Incldues information on chemical, physical, engineering and economical facets of CO2 capture and utilization * Offers in-depth insight into materials design, processing characterization, and computer modeling with respect to CO2 capture and conversion Written for catalytic chemists, electrochemists, process engineers, chemical engineers, chemists in industry, photochemists, environmental chemists, theoretical chemists, environmental officers, "Engineering Solutions for CO2 Conversion" provides the most current and expert information on the many aspects and challenges of CO2 conversion.
