文献类型：期刊文献

英文题名：Nickel-based core-shell catalysts modified by Ca for dry reforming of methane with high sintering-and coke-resistance

作者：Huang, Mengtao[1];Xu, Ren[4];Deng, Liangyan[2];Zhao, Guofeng[2];Jiang, Dong[3];Si, Jiaqi[2];Xu, Haitao[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Anhui Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Mol Solids, Minist Educ, Wuhu 241002, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Shanghai Inst Technol, Fac Chem Engn & Energy Technol, Shanghai 201418, Peoples R China

年份：2026

卷号：200

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20255019694046);WOS:【SCI-EXPANDED(收录号:WOS:001641324200001)】；

基金：We are grateful for the financial support by the National Natural Science Foundation of China (21371058 and 22179038) , the Special Project for Peak Carbon Dioxide Emissions-Carbon Neutrality (21DZ1206700) from the Shanghai Municipal Science and Technology Commission, the Start-up Fund of Anhui Normal University (grant 903/762321 and 903/762332) .

语种：英文

外文关键词：Methane dry reforming; Nickel-based catalyst; Core-shell structure; Ca modification; Coke resistant

摘要：Dry reforming of methane (DRM), which involved converting methane and carbon dioxide into a synthesis gas, suffered from a stability issue caused by coke formation and sintering over Ni-based catalysts. In this study, a series of Ca-promoted Ni-based core-shell catalysts (4Ni-Cax@HSS, HSS: hollow silica spheres) were designed and synthesized using a facile one-pot microemulsion method. The optimal catalyst (4Ni-Ca0.2@HSS) with a Ca/ Ni molar ratio of 0.2 exhibited 83.3 % CH4 and 90.2 % CO2 conversions at 750 degrees C and 40,000 mL g- 1 h- 1 without coke deposition for 300 h. Studies on catalyst structure and carbon deposition indicated that Ca modification and the core-shell structure can not only promote CH4 and CO2 activation by reducing the size of Ni particles, thereby enhancing performance and inhibiting carbon deposition, but also enhance the interaction between Ni and SiO2 through promoting the formation of Ni-O-Si species, so as to suppress sintering. Further validation was achieved through a combination of kinetic studies, CH4/CO2 temperature-programmed surface reaction experiments, and pulse tests, which collectively confirmed that the addition of Ca significantly promoted the activation of CH4 and CO2.