The application of MOF-derived CeO2 to synthesize the Cu/CeO2 catalyst for the hydrogen production via water gas shift reaction

• Published in: International journal of hydrogen energy 2023-09, Vol.48 (75), p.29142-29152
• Main Authors: Kim, Hak-Min, Lee, Yong-Hee, Park, Min-Ju, Jeong, Dae-Woon
• Format: Article
• Language: English
• Subjects: Calcination temperature; Cu/CeO2 catalyst; Hydrogen; Metal organic frameworks; Water-gas shift reaction
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.04.093

The development of catalysts for the water-gas shift (WGS) reaction is attracting attention because of the increased interest in on-site small-scale hydrogen production, which requires highly active and stable catalytic performance under severe conditions. In this study, metal–organic frameworks (MOF), which have been adopted in various fields because of their high surface area, diversity of assemblies, and uniform porosity, were applied to prepare Cu/CeO2 catalysts for the WGS reaction. MOF-derived CeO2 (MDC) was obtained from a Ce-BTC-based MOF calcined at different temperatures. Various techniques were used to investigate the physicochemical properties of the Cu/MDC catalysts. Important properties that determine the catalytic performance, such as crystallinity, surface area, Cu dispersion, reducibility, and oxygen storage capacity (OSC), were affected by the treatment temperature of MDC. Among the Cu/MDC catalysts, Cu/MDC prepared with MDC that was treated at 400 °C (Cu/MDC(400)) exhibited the highest CO conversion at reaction temperatures of 200–400 °C. In addition, Cu/MDC(400) maintained 80% of its initial CO conversion after 48 h on stream, even at a very high gas hourly specific velocity of 50,233 mL·gcat−1·h−1. This result was attributed to the high surface area, Cu dispersion, OSC, and easier reducibility of the Cu/MDC(400) catalyst compared to Cu supported on MDC calcined at other temperatures. [Display omitted] •Metal organic frameworks derived CeO2 was adopted to synthesize Cu/CeO2 catalyst.•Calcination temperature of MOF-derived CeO2 (MDC) was studied to optimize catalyst.•Cu/MDC(400) catalyst showed the best performance among the prepared catalysts.•High performance was related to its high OSC, easier reducibility, and Cu dispersion.•Optimum calcination temperature was needed for high performance of Cu/CeO2 catalyst.