文献类型：期刊文献

英文题名：Performance enhancement of Ni/CaO-Al2O3 dual-function materials for integrated CO2 capture and conversion via dry reforming of methane

作者：Zhang, Lu[1];Zhou, Yuqi[1];Cui, Hongjie[2];Cheng, Zhenmin[1];Zhou, Zhiming[1]

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

年份：2026

卷号：320

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20253919215296);WOS:【SCI-EXPANDED(收录号:WOS:001577669800002)】；

基金：Financial support from the National Natural Science Foundation of China (22278143) is gratefully acknowledged.

语种：英文

外文关键词：Integrated CO2 capture and conversion; Dry reforming of CH4; Dual-function materials; Carbon deposition

摘要：Integrated CO2 capture and conversion via dry reforming of methane (ICCC-DRM) is an attractive approach for mitigating CO2 emissions while producing valuable syngas. Ni/CaO dual-function materials (DFMs) exhibit high initial CO2 capture capacity and conversion efficiency, but their long-term cyclic stability is limited by Ni and CaO sintering as well as carbon deposition. In this study, the incorporation of an appropriate amount of Al2O3 into Ni/CaO, combined with a suitably shortened conversion duration, effectively addresses these limitations. Al2O3, present in the form of Ca5Al6O14, not only spatially separates CaO particles to suppress their agglomeration and sintering but also strengthens metal-support interactions, thereby inhibiting Ni sintering. Moreover, optimizing the conversion duration enables a favorable balance between carbon deposition and residual CaCO3, supporting stable cyclic operation. The optimal Ni/CaO-Al2O3 DFM (CaO/Al2O3 mass ratio = 8) demonstrates excellent ICCC-DRM performance over 100 consecutive cycles (CO2 capture at 650 degrees C in 15 % CO2/N2 for 15 min; conversion at 650 degrees C in 3 % CH4/N2 for 7 min; gas hourly space velocity of 60 L/(g center dot h)), achieving a CO2 capture capacity of 5.0 mmol/g, CH4 conversion of 74.7 %, CO2 conversion of 83.6 %, H2 space-time yield of 1.38 mmol/ (g center dot min), CO space-time yield of 1.44 mmol/(g center dot min), H2/CO ratio of 0.96, and carbon deposition of 0.43 mmol/g by the 100th cycle.