Effect of spacer groups on the performance of MCM-41-supported platinum cluster-derived hydrogenation catalysts

Abstract

MCM-41 was functionalized with (EtO) 3SiCH 2Cl, (MeO) 3SiCH 2CH 2CH 2Cl, and (CH 3)Cl 2SiCH 2Cl. The functionalized materials were characterized by solid-state NMR (CPMAS, 29Si and 13C) and XPS. The NMR data indicate that three new silicon environments were created by (EtO) 3SiCH 2Cl and (MeO) 3SiCH 2CH 2CH 2Cl, whereas with (CH 3)Cl 2SiCH 2Cl, two new silicon environments were obtained. XPS results from Si 2 p core level and the valence band from the material functionalized by (MeO) 3Si(CH 2) 3Cl was found to be the same as that of the corresponding fresh catalyst ( 1a), in contrast to that of the materials functionalized by the other two silane reagents. After further functionalization with triethylamine, these materials were used as inorganic anion exchangers to support the cluster anion [Pt 12(CO) 24] 2−. Solid-state NMR ( 29Si, 13C, 15N) was used to establish the presence of the quaternary ammonium group in the cluster-supported species. Analogous materials were also created using fumed silica as the support, and all of the cluster-supported materials were tested as catalysts for the hydrogenation of methyl pyruvate, acetophenone, nitrobenzene, benzonitrile, ethylacetoacetate, 4-nitrotoluene, cyclohexanone, allyl alcohol, and styrene. The best activity was obtained for the catalyst that had MCM-41 as the support and chloropropyl as the spacer group. TEM showed that the supports and the spacer groups had observable effects on the platinum crystallite size of the catalysts.