Kinetic and Infrared Study of the Effect of Metal Crystallite Size and Metal-support Interactions on CO Hydrogenation Reactions PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Platinum and palladium supported on four different oxide materials - SiO2, Al2O3, SiO2-Al2O3, and TiO2 - have been studied in depth. Different preparative techniques were utilized to vary metal particle size and change the state of the metal. For example, Pt and Pd deposited on TiO2 and reduced at low temperatures (175 to 200°C) exhibit normal adsorption behavior, whereas these same catalysts reduced at a high temperature (500°C) transform into an SMSI (Strong Metal-Support Interactions) state and chemisorption becomes greatly reduced. Both fresh and used samples were characterized by H2, and CO chemisorption. In addition, O2 chemisorption and the H2-O2 titration reaction were conducted on most fresh reduced Pt and Pd catalysts to further characterize their adsorption properties and to determine the agreement among these various chemisorption techniques. X-ray line broadening measurements were than conducted on all catalyst samples, and TEM was used to further characterize selected samples, especially the Ni catalysts. Metal loadings were determined by Neutron Activation Analysis. Tables 1 and 2 provide the chemisorption data on Pt and Pd catalysts respectively, and Tables 3 and 4 show the turnover frequencies (N) measured on Pt and Pd dispersed on various supports.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Platinum and palladium supported on four different oxide materials - SiO2, Al2O3, SiO2-Al2O3, and TiO2 - have been studied in depth. Different preparative techniques were utilized to vary metal particle size and change the state of the metal. For example, Pt and Pd deposited on TiO2 and reduced at low temperatures (175 to 200°C) exhibit normal adsorption behavior, whereas these same catalysts reduced at a high temperature (500°C) transform into an SMSI (Strong Metal-Support Interactions) state and chemisorption becomes greatly reduced. Both fresh and used samples were characterized by H2, and CO chemisorption. In addition, O2 chemisorption and the H2-O2 titration reaction were conducted on most fresh reduced Pt and Pd catalysts to further characterize their adsorption properties and to determine the agreement among these various chemisorption techniques. X-ray line broadening measurements were than conducted on all catalyst samples, and TEM was used to further characterize selected samples, especially the Ni catalysts. Metal loadings were determined by Neutron Activation Analysis. Tables 1 and 2 provide the chemisorption data on Pt and Pd catalysts respectively, and Tables 3 and 4 show the turnover frequencies (N) measured on Pt and Pd dispersed on various supports.
Author: American Chemical Society, Committee on Professional Training Staff Publisher: ISBN: 9780841214187 Category : Science Languages : en Pages : 1390
Author: Annemie Bogaerts Publisher: MDPI ISBN: 3038977500 Category : Technology & Engineering Languages : en Pages : 248
Book Description
Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO2 conversion into value-added chemicals and fuels, N2 fixation for the synthesis of NH3 or NOx, methane conversion into higher hydrocarbons or oxygenates. It is also widely used for air pollution control (e.g., VOC remediation). Plasma catalysis allows thermodynamically difficult reactions to proceed at ambient pressure and temperature, due to activation of the gas molecules by energetic electrons created in the plasma. However, plasma is very reactive but not selective, and thus a catalyst is needed to improve the selectivity. In spite of the growing interest in plasma catalysis, the underlying mechanisms of the (possible) synergy between plasma and catalyst are not yet fully understood. Indeed, plasma catalysis is quite complicated, as the plasma will affect the catalyst and vice versa. Moreover, due to the reactive plasma environment, the most suitable catalysts will probably be different from thermal catalysts. More research is needed to better understand the plasma–catalyst interactions, in order to further improve the applications.
Author: Ruijun Hou Publisher: Springer ISBN: 981100773X Category : Science Languages : en Pages : 151
Book Description
This thesis offers novel methods for catalyst and process design for the selective hydrogenation of acetylene and 1,3-butadiene. The author predicts the properties of supported Pd–Ni bimetallic catalysts using density functional theory (DFT) calculations and temperature-programmed desorption (TPD). The excellent correlation between model surfaces and supported catalysts demonstrates the feasibility of designing effective bimetallic catalysts for selective hydrogenation reactions. The author also proposes a method for designing non-precious metal catalysts to replace precious metals. She modifies the process of selective hydrogenation of acetylene by coupling the selective adsorption to the selective hydrogenation in the liquid phase, as a result of which the ethylene selectivity is greatly improved and heat transfer is greatly enhanced. Lastly, by analyzing the mechanism of liquid-phase hydrogenation, the author proposes a multi-stage slurry bed reactor for industrial applications.“/p>
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Author: American Chemical Society, Committee on Professional Training Staff
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Author: Annemie Bogaerts
Author: Ruijun Hou