O-18 TRACER STUDIES OF CO OXIDATION WITH O2 ON MOO3 .2. ACTIVE-SITES FOR CO OXIDATION WITH O2 AND FOR OXYGEN-ISOTOPE EXCHANGE BETWEEN CO2 AND MOO3

Authors
IIZUKA Y TANIGAKI H SANADA M TSUNETOSHI J YAMAUCHI N ARAI S
Citation
Y. Iizuka et al., O-18 TRACER STUDIES OF CO OXIDATION WITH O2 ON MOO3 .2. ACTIVE-SITES FOR CO OXIDATION WITH O2 AND FOR OXYGEN-ISOTOPE EXCHANGE BETWEEN CO2 AND MOO3, Journal of the Chemical Society. Faraday transactions, 90(9), 1994, pp. 1307-1312
Citations number
9
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Journal title
Journal of the Chemical Society. Faraday transactions → ACNP
ISSN journal
09565000
Volume
90
Issue
9
Year of publication
1994
Pages
1307 - 1312
Database
ISI
SICI code
0956-5000(1994)90:9<1307:OTSOCO>2.0.ZU;2-B
Abstract
Oxygen isotope exchange between (CO2)-O-18 and MoO3 has been examined in connection with the catalytic oxidation of (CO)-O-16 with O-18(2)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 (CO2)-O-18 and (MoO3)-O-16. Th e observed time dependences of the yields of (CO2)O-18, (COO)-O-18-O-1 6 and (CO2)-O-16 in the exchange agreed satisfactorily with those calc ulated from the mobile and immobile site model. In the calculation, th e number of immobile sites was estimated to be 1.8% of the total surfa ce lattice oxide ions. The exchange rate at immobile sites was 13% of the total exchange rate.