Abstract
The interactions between NO 2 and BaCl 2/SiO 2 and Pt/BaCl 2/SiO 2 and the subsequent reaction of propene with the NO 2 derived surface and bulk complexes have been studied using FTIR. Barium nitrate species are generated in both cases along with surface nitrosyl species on Pt. Heating in vacuum increased the degree of crystallinity of the nitrate in the absence of Pt or in cases where Pt–Ba interactions were absent but led to partial decomposition for samples where Pt was in intimate contact with Ba. Heat treatment in the presence of propene accelerated the rate of nitrate decomposition for Pt/BaCl 2/SiO 2 and this could be further enhanced using a prereduced sample. Propene does not appear to interact directly with the nitrate but acts by removing oxygen from the metal surface. No evidence was obtained to indicate a role of organo-nitro species in the process.
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