Supported mesoporous Cu/CeO2-δ catalyst for CO2 reverse water–gas shift reaction to syngas. (3rd April 2020)

• Record Type: Journal Article
• Authors: Zhou, Guilin; Xie, Fengqiong; Deng, Lidan; Zhang, Guizhi; Xie, Hongmei
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 19(2020)
• Page Start: 11380
• Page End: 11393
• Publication Date: 2020-04-03
• Subjects: Mesoporous Cu/CeO2-δ catalyst -- Cu0–CeO2-δ interface structure -- Synergistic effect -- RWGS reaction -- CO2 -- CO; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.058
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The design and development of a high performance hydrogenation catalyst is an important challenge in the utilization of CO2 as resources. The catalytic performances of the supported catalyst can be effectively improved through the interaction between the active components and the support materials. The obtained results demonstrated that the oxygen vacancies and active Cu 0 species as active sites can be formed in the Cu/CeO2-δ catalysts by the H2 reduction at 400 °C. The synergistic effect of the surface oxygen vacancies and active Cu 0 species, and Cu 0 –CeO2-δ interface structure enhanced catalytic activity of the supported xCu/CeO2-δ catalysts. The electronic effect between Cu and Ce species boosted the adsorption and activation performances of the reactant CO2 and H2 molecules on the corresponding Cu/CeO2-δ catalyst. The Cu/CeO2-δ catalyst with the Cu loading of 8.0 wt% exhibited the highest CO2 conversion rate in the RWGS reaction, reaching 1.38 mmol·gcat −1 min −1 at 400 °C. Its excellent catalytic performance in the RWGS reaction was related to the complete synergistic interaction between the active species via Ce 3+ -□-Cu 0 (□: oxygen vacancy). The Cu/CeO2-δ composite material is a superior catalyst for the RWGS reaction because of its high CO2 conversion and 100% CO selectivity. Highlights: Cu 0 –CeO2-δ interface structure can be formed on the supported Cu/CeO2-δ catalyst. Surface rich Cu 0 species can improve the synergistic effect between oxygen vacancies and Cu 0 species. The synergistic effect between metal Cu and oxygen vacancies contributed to the high RWGS activity. Cu 0 –CeO2-δ interface structure contributed to the high CO2 hydrogenation activity.