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Partic. vol. 37 pp. 1-8 (April 2018)
doi: 10.1016/j.partic.2017.05.008

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

Hezhi Liua,b, Yongjun Jib,*, Yongxia Zhub, Guangna Wangb, Xueguang Wanga,*, Ziyi Zhongc, Fabing Sub

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yjji@ipe.ac.cnwxg228@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