ISSN:
1572-879X
Keywords:
Ammoxidation
;
toluene
;
benzonitrile
;
YBa2Cu3O6+x
;
YBa2Cu2CoO6+x
;
YBaCuCoO5
;
perovskites
;
oxide catalysts
;
superconductors
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Ammoxidation of toluene over the perovskites YBa2Cu3O6.1, YBa2Cu2CoO6.7 and YBaCuCoO4.9 was investigated at 400 °C. At low partial pressures of O2 benzonitrile was selectively formed, while CO2 was the main product at high pressures of O2. Systematic differences in activity were observed for the three phases and are related to the crystal contents of Cu and Co. At low O2 pressures, Cu-sites are active for nitrile formation, while Co-sites give CO2. At high O2 pressures, the activity for CO2 of Cu-sites increases more than that of Co-sites due to filling of near-surface oxygen vacancies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00764050
