Download or read book Gravimetric Adsorption Study of Hydrogen and Carbon Monoxide on a Supported Ruthenium Catalyst written by Wayne Allen Bollinger and published by . This book was released on 1976 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Kinetic Study on the Adsorption and Reaction of Hydrogen Over Silica supported Ruthenium and Silver ruthenium Catalysts During the Hydrogenation of Carbon Monoxide written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the catalytic hydrogenation of carbon monoxide has been a subject of considerable investigation for many years, its increasing economical attractiveness as an industrial source of hydrocarbons has recently led to a search for more active and selective catalysts. A fundamental problem in the development of such catalysts is an incomplete knowledge of the operative surface processes, due in large part to the inability to accurately measure surface concentrations of reactant species during reaction. Specifically, the concentration of surface hydrogen proves difficult to estimate using normally revealing techniques such as transient isotopic exchange due to kinetic isotope effects. Knowledge of such concentrations is essential to the determination of the mechanisms of adsorption and reaction, since many kinetic parameters are concentration dependent. It is the aim of this research to investigate the mechanism and kinetics of the adsorption and reaction of hydrogen on silica-supported ruthenium and silver-ruthenium catalysts during the hydrogenation of carbon monoxide. By preadsorbing carbon monoxide onto the surface of ruthenium and silver-ruthenium catalysts, the kinetics of hydrogen adsorption and reaction can be monitored upon exposure of this surface to ambient hydrogen gas. This is accomplished by conducting identical experiments on two separate systems. First, the formation of methane is monitored using mass spectroscopy, and specific reaction rates and apparent activation energies are measured. Next, in situ[sup 1]H-NMR is used to monitor the amount of hydrogen present on the catalyst surface during adsorption and reaction. The results for these two sets of experiments are then combined to show a correlation between the rate of reaction and the surface hydrogen concentration. Finally, transition state theory is applied to this system and is used to explain the observed change in the apparent activation energy. The structure sensitivity of hydrogen adsorption on ruthenium is then elucidated by comparison of these results with differential heats of hydrogen adsorption data for the two systems.
Download or read book A Kinetic Study on the Adsorption and Reaction of Hydrogen Over Silica supported Ruthenium and Silver ruthenium Catalysts During the Hydrogenation of Carbon Monoxide written by David Paul VanderWiel and published by . This book was released on 1998 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The apparent activation energy for methanation decreased from about 23 kcal/mol for Ru/SiO2 to about 18 kcal/mol for the Ag-Ru/SiO2 series. These results show good correlation with previous hydrogen microcalorimetry measurements on the same catalysts by our group. The mechanism of the synergistic effect of Ag on Ru is presented in terms of "portal site mediated adsorption", whereby hydrogen is supplied to the catalyst surface by rapid dissociative adsorption occurring at low coordination sites which are preferentially blocked by Ag in bimetallic systems.
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1976 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Observation of the Kinetically Relevant Site of CO Hydrogenation on Supported Ru Catalyst at 700 K by Time Resolved FT IR Spectroscopy written by and published by . This book was released on 2008 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-resolved FT-IR spectra of carbon monoxide hydrogenation over alumina-supported ruthenium particles were recorded on themillisecond time scale at 700 K using pulsed release of CO and a continuous flow of H2/N2 (ratio 0.067 or 0.15, 1 atm total pressure). Adsorbed carbon monoxide was detected along with gas phase products methane (3016 and 1306 cm-1), water (1900 +- 1300 cm-1), and carbon dioxide (2348 cm-1). Aside from adsorbed CO, no other surface species were observed. The rate of formation of methane is 2.5 +- 0.4 s-1 and coincides with the rate of carbon dioxide growth (3.4 +- 0.6 s-1), thus indicating that CH4 and CO2 originate from a common intermediate. The broad band of adsorbed carbon monoxide has a maximum at 2010 cm-1 at early times (36 ms) that shifts gradually to 1960 cm-1 over a period of 3 s as a result of the decreasing surface concentration of CO. Kinetic analysis of the adsorbed carbon monoxide reveals that surface sites absorbing at the high frequency end of the infrared band are temporally linked to gas phase product growth. Specifically, a (linear) CO site at 2026 cm-1 decays with a rate constant of 2.9 +- 0.1 s-1, which coincides with the rise constant of CH4. This demonstrates that the linear CO site at 2026 cm-1 is the kinetically most relevant one for the rate-determining CO dissociation step under reaction conditions at 700 K.
Download or read book Liquefied Natural Gas written by and published by . This book was released on 1978 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Hydrogenation of Carbon Monoxide on Supported Ruthenium an Ruthenium copper Catalysts written by S. Y. Lai and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetic Study of Hydrogenation of Carbon Monoxide on Ruthenium Catalyst written by Amthalal Manordas Patel and published by . This book was released on 1970 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Kinetics of the Methanation of Carbon Monoxide Over Nickel Catalysts written by Robert William Fontaine and published by . This book was released on 1973 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fischer Tropsch Synthesis Over a Ruthenium Catalyst written by John Gilbert Ekerdt and published by . This book was released on 1979 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption Measurements of Carbon Monoxide Oxygen and Hydrogen on a Platinum Black Catalyst written by James Montrose Graham and published by . This book was released on 1929 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal support Interactions in Cobalt Catalysts written by John Michael Zowtiak and published by . This book was released on 1983 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Catalytic Activation of Carbon Monoxide written by Peter C. Ford and published by . This book was released on 1981 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogenation of carbon monoxide over supported ruthenium iron and related bimetallic catalysts written by Ferdinand Stoop and published by . This book was released on 1986 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
