Affiliation:
1. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, People's Republic of China
2. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore
Abstract
Copper-doped ZnO-ZrO
2
solid solution catalysts were synthesized via co-precipitation for promoting CH
3
OH synthesis via hydrogenation of CO
2
. Various testing methods were applied to investigate the effect of various copper contents on the catalysts. The catalytic performance was evaluated by a fixed bed reactor. XRD, HRTEM and Raman spectra collectively indicated that a ZnO-ZrO
2
solid solution catalyst with 3% Cu had a higher Cu dispersion, while the H
2
-TPR results confirmed that a catalyst with 3% Cu had more Cu active sites under low temperature H
2
pretreatment. When the copper content increased to 5% and 10%, the catalyst showed a better Cu crystallinity and a worse Cu dispersion, which could have a negative effect. Therefore, the CO
2
conversion and methanol yield with a 3% CuZnO-ZrO
2
catalyst at 5 MPa, 250°C and 12 000 ml/(g h) increased by 8.6% and 7.6%, respectively. Moreover, the CH
3
OH selectivity and catalytic stability of the solid solution catalyst were better than those of the traditional CZA catalyst.
Funder
Natural Science Research Project of Jiangsu Universities