Effect of Ca on Perovskite La1−xCaxNiO3 Catalyst for CO2 Hydrogenation‐to‐Light Hydrocarbons in a Dielectric Barrier Discharge Plasma Reactor.

Herein, the effects of the incorporation amount of Ca on the formation of C2–C4 in the hydrogenation of CO2‐to‐light hydrocarbons are studied in a hybrid dielectric barrier discharge–perovskite catalysis system. A series of La1−xCaxNiO3 (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, H2‐temperature‐programmed reduction, CO2‐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 La1−xCaxNiO3, 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 LaNiO3 perovskite catalysts is enhanced by doping Ca cation in the A site, while the La0.7–Ca0.3–Ni catalyst exhibits the optimum performance and achieves CO2 conversion as high as 83.1% with selectivity of C2–C4 as 11.8%. The characterization results show that the perovskite La0.7–Ca0.3–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 CO2 and then resulting in a higher CO2 conversion. [ABSTRACT FROM AUTHOR]

Copyright of Energy Technology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)