Portal de Periódicos da CAPES

Catalytic behaviour of interlayer-supported palladium(II) complexes on lithium hectorite

1989; Science Press; Volume: 55; Issue: 1 Linguagem: Inglês

10.1016/0304-5102(89)80269-x

1873-3131

Shogo Shimazu, Tadashi Ishida, Takayoshi Uematsu,

Inorganic and Organometallic Chemistry

Aminated lithium hectorites, HT-A1 (-OSiMe2CH2OCH2CH2NH2) and HT-A2 (-OCH2CH2NH2), were prepared by chemical modification of the OH group in lithium hectorite (LHT). Interlayer-supported PdII 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 (d001) 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.