Converting industrial waste contact masses into effective multicomponent copper-based catalysts for the Rochow process--颗粒学报PARTICUOLOGY

Liu, H., Ji, Y., Zhu, Y., Wang, G., Wang, X., Zhong, Z., & Su, F. (2018). Converting industrial waste contact masses into effective multicomponent copper-based catalysts for the Rochow process. Particuology, 37, 1-8. https://doi.org/10.1016/j.partic.2017.05.008

Converting industrial waste contact masses into effective multicomponent copper-based catalysts for the Rochow process

Hezhi Liu ^{a b}, Yongjun Ji ^b *, Yongxia Zhu ^b, Guangna Wang ^b, Xueguang Wang ^a *, Ziyi Zhong ^c, Fabing Su ^b

a State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
b State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
c Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island 627833, Singapore

10.1016/j.partic.2017.05.008

Volume 37, April 2018, Pages 1-8

Received 22 March 2017, Revised 26 April 2017, Accepted 2 May 2017, Available online 30 August 2017, Version of Record 3 February 2018.

E-mail: yjji@ipe.ac.cn; wxg228@shu.edu.cn

Highlights

• Multicomponent Cu-based catalysts were prepared from industrial waste contact masses (WCMs).

• Cu powder was recovered via acid leaching, followed by partial oxidation and ball milling.

• Optimized Cu–Cu₂O–CuO exhibited good (CH₃)₂SiCl₂ selectivity when re-used in Rochow synthesis.

Abstract

In this work, we report a simple and inexpensive approach to synthesize effective multicomponent Cu–Cu₂O–CuO catalysts for the Rochow process from industrial waste contact masses (WCMs). WCMs from the organosilane industry were treated with acid followed by reduction with metallic iron powder. The obtained copper powder was then subjected to controlled oxidation in air at different temperatures, followed by ball milling. The orthogonal array approach was applied to optimize this process, and the stirring speed and pH were found to significantly affect the leaching ratio and copper yield, respectively. When used for the Rochow process, the optimized ternary Cu–Cu₂O–CuO catalyst greatly enhanced the dimethyldichlorosilane selectivity and Si conversion compared with Cu–Cu₂O–CuO catalysts prepared without ball milling, bare Cu catalysts, and Cu–Cu₂O–CuO catalysts with different compositions. This could be attributed to their small particle size and the strong synergistic effect among the multiple components in the catalyst with the optimized composition.

Graphical abstract

Keywords

Acid leaching; Controlled synthesis; Solid Waste; Copper-based catalyst; Rochow reaction

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