Hits:

Indexed by:期刊论文

Date of Publication:2018-02-14

Journal:CHEMISTRYSELECT

Included Journals:SCIE

Volume:3

Issue:6

Page Number:1658-1666

ISSN No.:2365-6549

Key Words:cobalt silicides; cinnamaldehyde; heterogeneous catalysis; microwave synthesis; phase transitions

Abstract: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.