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论文类型：期刊论文

发表时间：2018-02-14

发表刊物：CHEMISTRYSELECT

收录刊物：SCIE

卷号：3

期号：6

页面范围：1658-1666

ISSN号：2365-6549

关键字：cobalt silicides; cinnamaldehyde; heterogeneous catalysis; microwave synthesis; phase transitions

摘要：Metal silicides are unconventional heterogeneous catalysts. Herein, cobalt silicide nanoparticles (NPs) embedded in N-doped carbon (CoxSi@C-N) catalysts have been synthesized by microwave-assisted silicification of metal-organic framework-templated Co@C-N NPs successfully. The phase transitions of cobalt silicide can be controlled by the numbers of microwave cycles. The synthesized CoxSi@C-N-2 catalyst possesses an ordered and uniform porous structure, high cobalt content (8.85 at.%), high specific surface area (236m(2) g(-1)), and highly dispersed and small NPs (10-15nm). The cobalt silicide catalyst is firstly used for selective hydrogenation of cinnamaldehyde. Owing to the strong modification of geometric structure and electronic properties by silicon, the particle size effect, and the Mott-Schottky effect at the metal-support interface, the as-synthesized CoxSi@C-N exhibits catalytic performance that is superior to its counterpart Co@C-N. In addition, this silicide catalyst sustains the robust stability in hydrogenation of cinnamaldehyde.