Format

Send to

Choose Destination
Nanoscale Res Lett. 2017 Aug 8;12(1):481. doi: 10.1186/s11671-017-2258-7.

Fabrication of Yolk-Shell Cu@C Nanocomposites as High-Performance Catalysts in Oxidative Carbonylation of Methanol to Dimethyl Carbonate.

Author information

1
Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education and Shanxi Province, No. 79 Yingze West Street, Taiyuan, 030024, China.
2
Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education and Shanxi Province, No. 79 Yingze West Street, Taiyuan, 030024, China. renjun@tyut.edu.cn.

Abstract

A facile way was developed to fabricate yolk-shell composites with tunable Cu cores encapsulated within hollow carbon spheres (Cu@C) with an average diameter about 210 nm and cavity size about 80 nm. During pyrolysis, the confined nanospace of hollow cavity ensures that the nucleation-and-growth process of Cu nanocrystals take place exclusively inside the cavities. The size of Cu cores can be easily tuned from 30 to 55 nm by varying the copper salt concentration. By deliberately creating shell porosity through KOH chemical activation, at an optimized KOH/HCS mass ratio of 1/4, the catalytic performance for the oxidative carbonylation of methanol to dimethyl carbonate (DMC) of the activated sample is enhanced remarkably with TOF up to 8.6 h-1 at methanol conversion of 17.1%. The activated yolk-shell catalyst shows promising catalytic properties involving the reusability with slight loss of catalytic activity and negligible leaching of activated components even after seven recycles, which is beneficial to the implementation of clean production for the eco-friendly chemical DMC thoroughly.

KEYWORDS:

Confinement effect; Cu@C nanocomposites; Dimethyl carbonate; Oxidative carbonylation; Yolk-shell structures

Supplemental Content

Full text links

Icon for Springer Icon for PubMed Central
Loading ...
Support Center