18O tracer studies of CO oxidation with O2on MoO3. Part 2.—Active sites for CO oxidation with O2and for oxygen isotope exchange between CO2and MoO3

Autor:	Naruki Yamauchi, Shigeyoshi Arai, Yasuo Iizuka, Haruyuki Tanigaki, Masakazu Sanada, Junji Tsunetoshi
Rok vydání:	1994
Předmět:	chemistry.chemical_compound Catalytic oxidation Chemistry TRACER Inorganic chemistry Oxide Physical and Theoretical Chemistry Site model Isotopes of oxygen Ion
Zdroj:	J. Chem. Soc., Faraday Trans.. 90:1307-1312
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9949001307
Popis:	Oxygen isotope exchange between C 18O2 and MoO3 has been examined in connection with the catalytic oxidation of C 16O with 18O2 on MoO3. Oxide ions at mobile and immobile sites on MoO3, which oxidize CO in the catalytic oxidation, were found to work also as active sites in the oxygen isotope exchange between C 18O2 and Mo 16O3. The observed time dependences of the yields of C 18O2, C 18O 16O and C 16O2 in the exchange agreed satisfactorily with those calculated from the mobile and immobile site model. In the calculation, the number of immobile sites was estimated to be 1.8% of the total surface lattice oxide ions. The exchange rate at immobile sites was 13% of the total exchange rate.
Databáze:	OpenAIRE
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