AUTHOR=Song Fujiao , Gao Jia , Yang Bairen , Cao Yan , Liu Huanhuan , Xu Qi 

TITLE=Cu2In alloy-embedded ZrO2 catalysts for efficient CO2 hydrogenation to methanol: promotion of plasma modification

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1187762

DOI=10.3389/fchem.2023.1187762

ISSN=2296-2646

ABSTRACT=Cu1In2Zr4-O-C catalysts with Cu2In alloy structure were prepared by sol-gel method. Cu1In2Zr4-O-PC and Cu1In2Zr4-O-CP catalysts were obtained from plasma modified Cu1In2Zr4-O-C before and after calcination respectively. Under the conditions of reaction temperature 270 ℃, reaction pressure 2 MPa, CO2/H2=1/3 and GHSV=12000 mL/(g·h), Cu1In2Zr4-O-PC catalyst has a high CO2 conversion of 13.3%, methanol selectivity of 74.3% and CH3OH space-time yield of 3.26 mmol/gcat/h. The characterization results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and temperature-programmed reduction chemisorption (H2-TPR) showed that the plasma modified catalyst had a low crystallinity, small particle size, good dispersion and excellent reduction performance, leading to a better activity and selectivity. Through plasma modification, the strong interaction between Cu and In in Cu1In2Zr4-O-CP catalyst, the shift of Cu 2p orbital binding energy to a lower position, and the decrease of reduction temperature all indicate that the reduction ability of Cu1In2Zr4-O-CP catalyst is enhanced, and the CO2 hydrogenation activity is improved.