期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 24, 页码 27268-27276出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06763
关键词
Cu catalyst; self-assemble; stability; hybrid; carbon nanotubes
资金
- National Natural Science Foundation of China [21703100, 21972113]
- National Key Research and Development Program of China [2017YFA0206801]
- Program for Innovative Research Team in Chinese Universities [IRT_14R31]
Catalyst deactivation is one of the most important issues in heterogeneous catalysis. Constructing a stable nanoscale structure that maintains efficient activity and prolonged stability under redox conditions for catalysis, particularly hydrogenation reactions, remains attractive albeit the flourishing nanoscience. This work presents a facile route to synthesize a semi-encapsulated transition metal by assembling three-dimensional transition metal silicate nanotubes onto carbon nanotubes (CNTs) as precursors. The obtained materials expose an active surface of the transition metal for efficient catalysis and form a specific structure to inhibit the migration of metal nanoparticles (NPs) by establishing strong metal-support interactions. Cu@SiO2 prepared by common precipitation shows an inferior activity, and its performance is easily attenuated because of the aggregation of Cu NPs. The addition of CNTs as a carrier doubles the intrinsic activity of Cu catalysts. This hybrid catalyst, which consists of Cu species, SiO2, and CNTs, is among the best catalysts for dimethyl oxalate hydrogenation with boosting activity of 25 h(-1) and enhanced stability of more than 200 h.
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