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Influence of Microwave Irradiation on the Structural Properties of Carbon‐Supported Hollow Copper Nanoparticles and Their Effect on the Synthesis of Dimethyl Carbonate
Author(s) -
Ren Meijiao,
Ren Jun,
Hao Panpan,
Yang Jinzhou,
Wang Donglei,
Pei Yongli,
Lin JianYing,
Li Zhong
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201501182
Subject(s) - dimethyl carbonate , selectivity , catalysis , ostwald ripening , copper , nanoparticle , irradiation , adsorption , materials science , desorption , microwave , carbon fibers , chemical engineering , chemistry , nanotechnology , organic chemistry , composite material , metallurgy , physics , quantum mechanics , composite number , nuclear physics , engineering
Novel activated carbon (AC)‐supported highly dispersed hollow Cu nanoparticles (NPs) (Cu/AC) with exposed {1 1 1} facets have been prepared by microwave irradiation for the synthesis of dimethyl carbonate (DMC). In particular, Cu NPs with a large cavity diameter of 35 nm are formed after irradiation from room temperature to 360 °C within a mere 8 min without additional irradiation, thus benefiting from the rapid heating of the microwave procedure. In this study, an Ostwald ripening mechanism is proposed. DFT calculations are consistent with the analysis of CO temperature‐programmed desorption, which found that Cu(1 1 1) facets are more favorable for the weak adsorption of CO, which supports the formation of DMC. The as‐prepared catalysts exhibit the highest DMC formation rate in terms of turnover frequency and 100 % selectivity for DMC can be achieved. The large surface area of the hollow Cu NPs and the exposed {1 1 1} crystal planes are highlighted as being responsible for the excellent catalytic rate and superior selectivity, respectively.