Metal-organic-framework derived controllable synthesis of mesoporous copper-cerium oxide composite catalysts for the preferential oxidation of carbon monoxide. (1st October 2018)

• Record Type: Journal Article
• Authors: Gong, Xia; Wang, Wei-Wei; Fu, Xin-Pu; Wei, Shuai; Yu, Wen-Zhu; Liu, Baocang; Jia, Chun-Jiang; Zhang, Jun
• Is Part Of: Fuel. Volume 229(2018)
• Page Start: 217
• Page End: 226
• Publication Date: 2018-10-01
• Subjects: Metal-organic-frameworks -- Surface active species -- Copper-cerium oxide composite -- CO-PROX; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2018.04.071
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: A facile MOFs-derived controllable strategy was developed to construct highly active Cux Ce1−x O2 catalysts through directly annealing Cux Ce1−x -BTC MOFs under different temperatures for CO-PROX reaction. Highlights: CuO-CeO2 catalysts are synthesized via thermolysis of Cux Ce1−x -BTC MOFs. Highly dispersed CuO clusters in CeO2 are beneficial for the CO-PROX reaction. Cu + sites are crucial for improving the catalytic performance of CuO-CeO2 catalyst. The reducibility and oxygen vacancies are important as well as Cu + sites. The synthetic approach is surfactant-free and scalable at a low cost. Abstract: Among currently studied catalysts, CuO-CeO2 based materials hold the greatest promise for the preferential oxidation of CO (CO-PROX). Recently, many efforts have been concentrated on developing the original nanostructures inherited from metal-organic-frameworks (MOFs), which are considered to be excellent sacrificial templates or precursors to achieve metal oxide (or metal) nanoparticles with unique structure. In this paper, we synthesized CuO-CeO2 catalysts using an efficient and general strategy derived from Cux Ce1−x -BTC MOFs after high temperature treatment. The as-prepared CuO-CeO2 catalysts display variable morphologies, crystal structures, and specific surface areas based on different ratios of Cu/Ce and calcination temperature. The catalytic performance shows that all CuO-CeO2 composite catalysts derived from the Cux Ce1−x -BTC MOFs via heat treatment exhibit excellent catalytic performance for the CO-PROX reaction, and the Cu0.3 Ce0.7 O2 is the most active catalyst obtained under high calcination temperature at 650 °C for 4 h, demonstrating that the increase of Cu content and high temperature treatment can create more highly dispersed CuO clusters, which is in favor of the CO-PROX reaction. Meanwhile, the in-situ DRIFTS results show that the Cu0.3 Ce0.7 O2 catalyst displays the super CO adsorption capability, which induces the difference of catalytic performance for the CO-PROX reaction.