Single-atom Sn-Zn pairs in CuO catalyst promote dimethyldichlorosilane synthesis

• 来源期刊: 国家科学评论（英文版）
• 关键词: dual single-atom promoters CuO catalyst dimethyldichlorosilane synthesis Rochow reaction catalytic performance
• 年，卷（期）: 2020,（3）
• 页码范围: 600-608
• 页数: 9页
• 语种: 英文
• DOI: 10.1093/nsr/nwz196

摘要

Single-atom catalysts are of great interest because they can maximize the atom-utilization efficiency and generate unique catalytic properties;however,much attention has been paid to single-site active components,rarely to catalyst promoters.Promoters can significantly affect the activity and selectivity of a catalyst,even at their low concentrations in catalysts.In this work,we designed and synthesized CuO catalysts with atomically dispersed co-promoters of Sn and Zn.When used as the catalyst in the Rochow reaction for the synthesis of dimethyldichlorosilane,this catalyst exhibited much-enhanced activity,selectivity and stability compared with the conventional CuO catalysts with promoters in the form of nanoparticles.Density functional theory calculations demonstrate that single-atomic Sn substitution in the CuO surface can enrich surface Cu vacancies and promote dispersion of Zn to its atomic levels.Sn and Zn single sites as the co-promoters cooperatively generate electronic interaction with the CuO support,which further facilitates the adsorption of the reactant molecules on the surface,thereby leading to the superior catalytic performance.