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Processes 2019, 7(4), 198; https://doi.org/10.3390/pr7040198

High-Performance Chlorine-Doped Cu2O Catalysts for the Ethynylation of Formaldehyde

1
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan 030001, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Research Center for Fine Chemical Engineering of the Ministry of Education, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
*
Author to whom correspondence should be addressed.
Received: 2 March 2019 / Revised: 25 March 2019 / Accepted: 2 April 2019 / Published: 6 April 2019
(This article belongs to the Special Issue Synthesis and Application of Novel Nanocatalysts)
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Abstract

The in situ formed Cu+ species serve as active sites in the ethynylation of formaldehyde. The key problem that needs to be solved in this process is how to avoid excessive reduction of Cu2+ to inactive metallic Cu, which tends to decrease the catalytic activity. In this work, Cl-modified Cu2O catalysts with different Cl content were prepared by co-precipitation. The characterization results demonstrated that Cl remained in the lattice structure of Cu2O, inducing the expansion of the Cu2O lattice and the enhancement of the Cu–O bond strength. Consequently, the reduction of Cu+ to Cu0 was effectively prevented in reductive media. Moreover, the activity and stability of Cu2O were significantly improved. The Cl modification increased the yield of 1,4-butynediol (BD) from 73% to 94% at a reaction temperature of 90 °C. More importantly, the BD yield of Cl modified Cu2O was still as high as 86% during the ten-cycle experiment, whereas the BD yield of Cu2O in the absence of Cl decreased sharply to 17% at the same reaction conditions. This work provides a simple strategy to stabilize Cu+ in reductive media. View Full-Text
Keywords: Cu2O; Cl modification; reducibility; formaldehyde ethynylation; 1,4-butynediol Cu2O; Cl modification; reducibility; formaldehyde ethynylation; 1,4-butynediol
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gao, J.; Yang, G.; Li, H.; Dong, M.; Wang, Z.; Li, Z. High-Performance Chlorine-Doped Cu2O Catalysts for the Ethynylation of Formaldehyde. Processes 2019, 7, 198.

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