文献类型：期刊文献

英文题名：Active metal-free CaO-based dual-function materials for integrated CO2 capture and reverse water-gas shift

作者：Zhou, Yuqi[1];Ma, Xiaoling[1];Yusanjan, Qogluk[1];Cui, Hongjie[2];Cheng, Zhenmin[1];Zhou, Zhiming[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Tsinghua Univ, Ind Catalysis Ctr, Dept Chem Engn, Beijing 100084, Peoples R China

年份：2024

卷号：485

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20240915658374);WOS:【SCI-EXPANDED(收录号:WOS:001194128600001)】；

基金：The work was supported by the National Natural Science Foundation of China (22278143) .

语种：英文

外文关键词：IntegratedCO(2) capture and conversion; Reverse water-gas shift; Dual-function materials; Active metal-free; CaO

摘要：Integrated CO2 capture and conversion into CO via the reverse water-gas shift reaction (ICCC-RWGS) using CaO-based dual-function materials (DFMs) offers an attractive avenue for mitigating anthropogenic CO2 emissions. Active metal-free CaO-based DFMs have advantages such as no CO formation at the CO2 capture stage and high CO selectivity across a broad temperature range at the CO2 conversion stage, yet they face challenges with low CO yield. Herein, we report the enhanced performance of CaO-based DFMs co-doped with gallium (Ga) and zirconium (Zr) oxides in the ICCC-RWGS process. This improvement can be attributed to the synergistic interaction among Ca, Ga and Zr oxides, resulting in reduced CaO crystallites, enhanced surface basicity, and increased concentration of oxygen vacancies. The most promising DFM consists of 90 wt% CaO, 4.5 wt% Ca3Ga4O9 and 5.5 wt% CaZrO3 (with a Ga/Zr molar ratio of 1). When exposed to a simulated flue gas (5 % O-2, 10 % H2O, 15 % CO2, and 70 % N-2), this DFM exhibits a stable CO2 capture capacity of 11.90 mmol/g(DFM) over 20 consecutive isothermal ICCC-RWGS cycles at 650 degrees C. Meanwhile, its CO2 conversion and CO yield are maintained at 83.4 % and 10.26 mmol/g(DFM), respectively. This study highlights the significance of a multi-metal oxide synergistic strategy in CaO-based DFMs to achieve superior performance in the ICCC-RWGS process.