Nanoclusters in Catalysis: A Comparison of CS2 Catalyst Poisoning of Polyoxoanion- and Tetrabutylammonium-Stabilized 40 ± 6 Å Rh(0) Nanoclusters to 5 Rh/Al2O3, Including an Analysis of the Literature Related to the CS2 to Metal Stoichiometry Issue

Autor:	Brooks J. Hornstein, John Davis Aiken, Richard G. Finke
Rok vydání:	2002
Předmět:	inorganic chemicals Fundamental study Chemistry Inorganic chemistry Cyclohexene Active surface Catalyst poisoning Catalysis Nanoclusters Inorganic Chemistry Metal chemistry.chemical_compound visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Stoichiometry
Zdroj:	Inorganic Chemistry. 41:1625-1638
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic010920y
Popis:	It is crucial in metal particle catalysis to know the true number of catalytically active surface sites; without this knowledge it is impossible (i) to know the true turnover frequency (TOF, i.e., the moles of product/(moles of active metal atoms × time)); (ii) to know for certain whether a (quantitatively) better catalyst has been madeon a per-active-metal-atom basis; (iii) to know the amount of active sites remaining in a deactivated catalyst; and (iv) to know how many active sites have been regenerated in a reactivated catalyst. For this reason, herein we report the first quantitative, more complete and fundamental study of nanocluster catalyst poisoning using the preferred CS2 method with polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters; 5% Rh/Al2O3 is also examined as a valuable comparison point. Both catalysts are examined under essentially identical conditions and while catalyzing a prototype reaction, cyclohexene hydrogenation. A number of control studies are also reported to be ...
Databáze:	OpenAIRE
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