非阻塞I/O
催化作用
钙钛矿(结构)
煅烧
拉尼奥
无机化学
程序升温还原
X射线光电子能谱
材料科学
解吸
吸附
化学
结晶学
化学工程
电介质
物理化学
工程类
铁电性
生物化学
光电子学
作者
Tingting Wang,Meng Su,Qiang Wang,Zhenhua Li
标识
DOI:10.1002/ente.202300180
摘要
Herein, the effects of the incorporation amount of Ca on the formation of C 2 –C 4 in the hydrogenation of CO 2 ‐to‐light hydrocarbons are studied in a hybrid dielectric barrier discharge–perovskite catalysis system. A series of La 1− x Ca x NiO 3 ( x = 0.1, 0.2, 0.3, 0.4) catalysts are prepared by a modified nitrate citric acid method. The catalysts are characterized by Brunauer−Emmett−Teller, X‐ray diffraction, transmission electron microscopy, H 2 ‐temperature‐programmed reduction, CO 2 ‐temperature‐programmed desorption, and X‐ray photoelectron spectroscopy. The results shows that NiO is dissolved on the catalyst surface after calcination, while NiO size increases with the rise of Ca amount. Meanwhile, different degrees of crystal defects are formed in La 1− x Ca x NiO 3 , leading to change of specific surface area, adsorbed oxygen amount, weak basic sites, and reductibility of NiO. The results show that the hydrogenation performance of LaNiO 3 perovskite catalysts is enhanced by doping Ca cation in the A site, while the La 0.7 –Ca 0.3 –Ni catalyst exhibits the optimum performance and achieves CO 2 conversion as high as 83.1% with selectivity of C 2 –C 4 as 11.8%. The characterization results show that the perovskite La 0.7 –Ca 0.3 –Ni catalyst has lattice defects in the structure, high proportion of adsorbed oxygen, and more weak basic sites, thus promoting the adsorption and activation of CO 2 and then resulting in a higher CO 2 conversion.
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