IR characterization of adsorbed species over supported transition metals; relevance to catalytic transformations

Kiss T., János and Pálinkó, István (1997) IR characterization of adsorbed species over supported transition metals; relevance to catalytic transformations. JOURNAL OF MOLECULAR STRUCTURE, 410-41. pp. 99-102. ISSN 0022-2860

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Abstract

Results of IR investigations are reported on surface reactions over Pd, Rh and Ni catalysts supported on fumed silica (Cab-O-Sil, CS for short). The catalysts were of low dispersion and were studied in (a) double-bond isomerization of methylenecyclohexane (MCH), (b) ring opening of 1,1-dimethylcyclopropane (DMCP), and (c) ring opening of DMCP in the presence of D-2. During double-bond isomerization of MCH, H-D exchange (and OH-OD exchange on the support) also took place. When DMCP was introduced into the system, dissociative adsorption occurred (scission of one or more C-H bonds preceded C-C bond rupture). Strongly adsorbed hydrocarbon-like residues were also formed. When a DMCP + D-2 mixture was allowed to react on the catalysts, measurements indicated dissociative-type adsorption over Pd/CS (at 298 and 373 K), Ni/CS (at 298 and 473 K) and Rh/CS (at 298 K).

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