ZENG Wei, LIU Jia, ZHANG Dejin, YANG Guoqiang, ZHANG Zhibing. Preparation of catalyst Pd-Au/1cTiO2/SiO2 and epoxidation of olefins[J]. CIESC Journal, 2020, 71(11): 4999-5006 DOI: 10.11949/0438-1157.20200778.
ZENG Wei, LIU Jia, ZHANG Dejin, YANG Guoqiang, ZHANG Zhibing. Preparation of catalyst Pd-Au/1cTiO2/SiO2 and epoxidation of olefins[J]. CIESC Journal, 2020, 71(11): 4999-5006 DOI: 10.11949/0438-1157.20200778.DOI:
Preparation of catalyst Pd-Au/1cTiO2/SiO2 and epoxidation of olefins
Two kinds of Pd-Au bimetallic nanocatalysts (0.01% Pd-Au/1cTiO
2
/SiO
2
and 0.05% Pd-Au/1cTiO
2
/SiO
2
) were prepared by using 1cTiO
2
/SiO
2
as support
which had a single layer TiO
2
thin film on SiO
2
substrate by atomic layer deposition (ALD) technique. Deposition of Au and Pd on 1cTiO
2
/SiO
2
was carried out by means of deposition precipitation and impregnation. Au loading of the two catalysts was both 0.01%(mass)
and the Pd loading were 0.01% and 0.05% respectively. The prepared catalysts were characterized by transmission electron microscopy (TEM)
energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS)
and the morphology of nanoparticles
the chemical valence state and composition of Pd and Au elements were determined. The Pd-Au bimetallic nanocatalysts were used in the selective epoxidation of cyclohexene using oxygen as oxidant
and the conditions such as the reaction solvent
the type of co-reductant and the reaction temperature were screened. The applicability of the catalyst to different structural olefins was investigated under the optimized reaction conditions. For cyclic olefins
the substrate conversion rate is greater than 95%
and the epoxy product selectivity is greater than 91%. After the catalyst is recycled 5 times
the catalytic activity and reaction selectivity remain unchanged.
关键词
Keywords
references
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