Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 501 - 508 (1982)
Update date:2022-08-11
Topics:
Iizuka, Tokio
Itoh, Masahumi
Hattori, Hideshi
Tanabe, Kozo
The adsorption and reaction of nitric oxide on reduced molybdena-zirconia were studied by means of e.s.r., i.r. and u.v. spectroscopies.On the surface, at least two types of nitrosyl complex exist.At an early stage of reduction, a diamagnetic dinitrosyl complex with i.r. bands at ca. 1790 and 1690 cm-1 formed on NO adsorption and was ascribed to Mo(4+)(NO)2.After reduction at a higher temperature, a paramagnetic dinitrosyl species appeared upon NO adsorption and was tentatively assigned to Mo(5+)(NO)2.Nitric oxide can adsorb on Mo(5+) in tetrahedral coordination, but not on Mo(5+) in octahedral coordination.This can be explained by the coordination being limited.For the reaction of NO with H2, the species of Mo(5+)(NO)2 was concluded to be a main active complex in the catalytic cycle.
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