Abstract
Aminated lithium hectorites, HT-A1 (-OSiMe 2CH 2OCH 2CH 2NH 2) and HT-A2 (-OCH 2CH 2NH 2), were prepared by chemical modification of the OH group in lithium hectorite (LHT). Interlayer-supported Pd II complexes on LHT, Pd/HT-A1 and Pd/HT-A2 were synthesized by the reaction of [Pd(OAc) 2] 3 with HT-Al and HT-A2, respectively. XRD studies showed that the basal spacings ( d 001) of LHT and Pd/HT-A1 swollen with solvents varied with the dipole moment of the solvent. Catalytic activities and selectivities of Pd/HT-A1 for the hydrogenation of mono-olefins and dienes were investigated in the liquid-solid heterogeneous system. The hydrogenation rate decreased in the order 1-pentene > 2-methyl-1-butene > cyclo-octene. The selectivity for partial hydrogenation depended on the type of diene: conjugated dienes > unconjugated dienes. The selectivity for the partial hydrogenation of isoprene by Pd/HT-A1 was independent of the solvent, while that of the homogeneous catalyst [Pd(OAc) 2] 3 increased with increasing dipole moment of the solvent.
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