Cu/SiO2 derived from copper phyllosilicate for low-temperature water-gas shift reaction: Role of Cu+ sites. (16th October 2020)

• Record Type: Journal Article
• Authors: Bian, Zhoufeng; Zhong, Wenqi; Yu, Yang; Jiang, Bo; Kawi, Sibudjing
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 51(2020)
• Page Start: 27078
• Page End: 27088
• Publication Date: 2020-10-16
• Subjects: WGSR -- Cu/SiO2 -- Copper phyllosilicate -- Cu+; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.07.054
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Copper phyllosilicate supported over silica was prepared with ammonia evaporation method. Compared with the catalyst synthesized with conventional impregnation method, this novel catalyst showed a much higher activity and stability towards low-temperature water-gas shift reaction. Various characterization methods indicated the Cu nanoparticle in the catalyst had a superb small diameter around 3 nm, co-existent with abundant Cu + sites. Based on the analysis via CO-adsorption, DRIFTS and in-situ mass spectrum, it was proved that CO could be adsorbed on Cu + strongly and Cu + acted as the active sites for CO activation. The reaction mechanism with dual active sites prevented the competitive adsorption of H2 O and CO onto Cu 0 sites, thereby improving the catalytic activity and stability. Highlights: Supported small copper nanoparticles (~3 nm) were derived from phyllosilicate. Partially reduced phyllosilicate also created abundant Cu + sites. Cu + species acted as CO activation sites, improving WGS activity and stability. Existence of Cu + sites prevented the competitive adsorption of CO and steam.