Volume 39: Energy Transitions toward Carbon Neutrality: Part II

Light-enhanced Catalyzed Hydrogenation of Gaseous CO2 over Nanostructured Ni-Fe/La0.8Sr0.2FeO3 Qiong Rao, Tianlong Yang, Jinrui Zhang, Yang Li, Zhongrui Gai, Ying Pan

Abstract

Global warming and climate change caused by greenhouse gas emissions have become urgent issues. Light-enhanced reverse water gas shift (RWGS) process is capable of efficiently converting CO2 to CO at a low temperature with impressive rates by the La0.8Sr0.2FeO3-supported Ni-Fe alloy (Ni-Fe/LSF). We test the reactivity of RWGS driven by pure thermal and photo-thermal coupled conditions in the same flow fixed-bed reactor. The results indicate that the apparent activation energy of RWGS reaction decreases by nearly 50% under direct light irradiation, and the CO production rate is enhanced by 2 times. In addition, the effects of light intensity on the reaction performance of CO2 hydrogenation reaction and long-term stability are investigated. The formation of (Fe, Ni) phase is conducive to the high reactivity of the catalyst during long-term operation. By combining a suitable concentrating solar system, a matched photo-thermal reactor and optimizing the operating conditions, it is expected to achieve highly efficient CO2 conversion at low temperatures through solar energy utilization.

Keywords photothermal catalysis, CO2 conversion, solar energy, reverse water gas shift, Ni-Fe/LSF