Number of surface sites and turnover frequencies for oxide catalysts

Wachs, Israel E.

doi:10.1016/j.jcat.2021.12.032

Title: Number of surface sites and turnover frequencies for oxide catalysts

Journal Article · 04 January 2022 · Journal of Catalysis

DOI: https://doi.org/10.1016/j.jcat.2021.12.032 · OSTI ID:1977253

Wachs, Israel E. ^[1]

Lehigh Univ., Bethlehem, PA (United States); OSTI

Unlike for metal catalysts where selective chemisorption probes (H₂, O₂, CO and N₂O) have been successfully applied to count the number of active surface sites and allow determination of TOF values, the analogous situation for oxide catalysts has developed very slowly. The reason for the sluggish development of selective chemisorption probes for oxides is that the same chemisorption probes that work well with metals aren’t compatible with oxides since these chemical probes weakly adsorb on oxides. Methanol, however, is a very reactive molecule that has been found to readily chemisorb on oxides and allows for quantitative determination of the number of active surface sites (Ns). Here, in this mini-review, the determination of the number of active sites by methanol chemisorption is reviewed with examples for pure oxides (one-component oxides), supported oxides (submonolayer, monolayer and above monolayer) and bulk mixed oxides (surface enriched oxide present in submonolayer, monolayer and in excess of monolayer coverages).

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012577

OSTI ID:: 1977253

Journal Information:: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 405; ISSN 0021-9517

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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