Fundamental insights into sintering of Ag/γ-Al2O3 catalysts

Randall Meyer, John Lockemeyer, Donald Reinalda, Randy Yeates, Michael Lemanski, Matthew Neurock

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ethylene oxide production continues to be one of the most important processes in the basic chemicals industry. This reaction is typically catalyzed by silver particles supported on α-Al2O3. The adsorption and diffusion of various different potential mobile species were studied including single Ag atoms, small Ag clusters, AgOH, AgCl, and Ag2O over various surface terminations of α-Al2O3(0001). To establish the influence of the working environment, the adsorption and diffusion of the mobile Ag species were probed on Al-terminated, O-terminated, and various different hydroxylated α-Al2O3 surfaces. The presence of water served to lower barriers to diffusion for Ag atoms as compared to the oxygen terminated surface but decreased diffusion as compared to the more stable aluminum terminated surface. The influence of adsorbed heteroatoms on the detachment of silver from large particles was examined. The presence of Cl lowered the barrier to Ag atom emission. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 1/04/2005).

Original languageEnglish (US)
Title of host publication05AIChE
Subtitle of host publication2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
PublisherAmerican Institute of Chemical Engineers
ISBN (Print)0816909962, 9780816909964
StatePublished - Jan 1 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Publication series

NameAIChE Annual Meeting Conference Proceedings
Volume2005

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period10/30/0511/4/05

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