Testing site size requirements in chemisorption: experiment and theory

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''Ensemble requirements'' in surface chemistry refer to the number and shape of contiguous empty sites necessary for chemisorption of a particular molecule. Ensemble effects can play a major role in directing the course of surface reactions, leading, for example, to dramatic changes in catalytic selectivity when the active metal component is diluted upon alloying with an inert metal. We will review here fundamental surface science studies that have attempted to probe this site size requirement by diluting active sites on a single crystal surface with an inert metal overlayer. We will emphasize recent results in our lab on the interaction ... continued below

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Pages: 20

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Campbell, C.T.; Paffett, M.T. & Voter, A.F. January 1, 1985.

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''Ensemble requirements'' in surface chemistry refer to the number and shape of contiguous empty sites necessary for chemisorption of a particular molecule. Ensemble effects can play a major role in directing the course of surface reactions, leading, for example, to dramatic changes in catalytic selectivity when the active metal component is diluted upon alloying with an inert metal. We will review here fundamental surface science studies that have attempted to probe this site size requirement by diluting active sites on a single crystal surface with an inert metal overlayer. We will emphasize recent results in our lab on the interaction of simple molecules (CO, H/sub 2/, O/sub 2/) with Cu-, Ag-, and Bi-dosed Pt(111). Theoretical models based upon Monte-Carlo simulations will be summarized which, when compared to such data, allow more accurate determination of ensemble sizes. These models predict uptake curves that deviate strongly from the commonly used (1-theta)/sup A/ law (A = number of sites in ensemble), which is valid only for an array of isolated ensembles. 32 refs., 3 figs.

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Pages: 20

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NTIS, PC A02/MF A01; 1.

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  • 32. national vacuum symposium and topical conference, Houston, TX, USA, 19 Nov 1985

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  • Other: DE86000766
  • Report No.: LA-UR-85-3252
  • Report No.: CONF-851174-9
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5040071
  • Archival Resource Key: ark:/67531/metadc1053145

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  • January 1, 1985

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 2, 2018, 12:17 p.m.

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Campbell, C.T.; Paffett, M.T. & Voter, A.F. Testing site size requirements in chemisorption: experiment and theory, article, January 1, 1985; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1053145/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.