Strong Metal-Promoter Oxide Interactions Induced by Calcination in V, Nb, and Ta Oxide Promoted Rh/SiO2 Catalysts Full article
Journal |
Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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Output data | Year: 1997, Volume: 167, Number: 2, Pages: 379-390 Pages count : 12 DOI: 10.1006/jcat.1997.1583 | ||||||
Tags | SUPPORT INTERACTIONS; VANADIUM-OXIDE; RH-CATALYSTS; REDUCTION TREATMENTS; RHODIUM CATALYSTS; CO; SURFACES; HYDROGENATION; REACTIVITY; SIO2 | ||||||
Authors |
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Affiliations |
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Funding (2)
1 | German Research Foundation | SFB 338 |
2 | Verband der Chemischen Industrie |
Abstract:
The influence of the calcination temperature on the structure of Rh/SiO2catalysts promoted by Vb transition metal oxides has been studied. Calcination atT > 973 K leads to the formation of crystalline RhXO4mixed oxides with increasing abundance in the order RhTaO4 < RhNbO4 < RhVO4. Their reduction atT=773 K yields highly dispersed Rh°metal particles which seem to be embedded in a matrix of partially reduced promoter oxide. The presence of Vb metal oxides enhances the noble metal dispersion as compared to unpromoted Rh/SiO2catalysts. Calcination atT=773 K establishes an interaction between Rh2O3and promoter oxide which manifests itself in a decreased CO-chemisorption capacity after low temperature reduction (LTR=523 K). This calcination induced metal–promoter interaction decreases with increasing atomic number of the promoter element.
Cite:
Beutel T.
, Siborov V.
, Tesche B.
, Knözinger H.
Strong Metal-Promoter Oxide Interactions Induced by Calcination in V, Nb, and Ta Oxide Promoted Rh/SiO2 Catalysts
Journal of Catalysis. 1997. V.167. N2. P.379-390. DOI: 10.1006/jcat.1997.1583 WOS Scopus РИНЦ
Strong Metal-Promoter Oxide Interactions Induced by Calcination in V, Nb, and Ta Oxide Promoted Rh/SiO2 Catalysts
Journal of Catalysis. 1997. V.167. N2. P.379-390. DOI: 10.1006/jcat.1997.1583 WOS Scopus РИНЦ
Dates:
Submitted: | Sep 26, 1996 |
Accepted: | Dec 5, 1996 |
Published print: | Apr 15, 1997 |
Published online: | May 25, 2002 |
Identifiers:
Web of science | WOS:A1997WW73000009 |
Scopus | 2-s2.0-0000400508 |
Elibrary | 13272780 |
Chemical Abstracts | 1997:285993 |
Chemical Abstracts (print) | 126:268846 |
OpenAlex | W2011365339 |