Surface Chemistry of Supported Chromium Oxide on Lanthanum Carbonate
1997; Elsevier BV; Volume: 171; Issue: 1 Linguagem: Inglês
10.1006/jcat.1997.1800
ISSN1090-2694
AutoresManh Hoang, A.E. Hughés, J. F. Mathews, Kerry C. Pratt,
Tópico(s)Mesoporous Materials and Catalysis
ResumoThe surface chemistry of supported chromium oxide on lanthanum carbonate has been studied by TPD, FTIR, XPS, and electrophoretic measurement techniques. The active center for the oxidative dehydrogenation of isobutane to isobutylene was identified as a chromate species bound to the surface of lanthanum carbonate. This species was formed as a result of interaction between chromium oxide and lanthanum carbonate surface through CO2elimination. FTIR and XPS experiments have confirmed a complete reversibility of active sites during reduction–oxidation.
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