OBSERVATION OF MOLECULAR REACTION INTERMEDIATE AND REACTION-MECHANISMFOR NO DISSOCIATION AND NO-H-2 REACTION ON RH-SN SIO2 CATALYSTS/

The Rh-Sn/SiO2 catalyst prepared by the selective reaction between Sn (CH3)(4) vapor and Rh particles on SiO2 was remarkably active for the NO dissociation and the catalytic NO-H-2 reaction, To obtain structura l information on the behavior of molecularly adsorbed intermediates re lated to the high activity of the bimetallic ensemble catalyst surface , in situ EXAFS and FTIR were employed, in parallel with reaction kine tics. We observed the molecular reaction intermediate, bent-type NO, b y EXAFS with the aid of FTIR, The reaction mechanism is discussed on t he basis of the characterization of adsorbed species and surface bimet allic structure. (C) 1995 Academic Press, Inc.