The Synergetic Effect of Dual Active Sites in ZnO-ZrO2 Catalyst for CO2 Hydrogenation to Methanol

The reaction of CO2 hydrogenation to methanol is a typical reaction requiring simultaneous activation of CO2 and H2. The ZnO-ZrO2 solid solution catalyst has been demonstrated to be an excellent catalyst, and the dual active site of Zn-O-Zr has been a key active site. However, the actual surface configuration of Zn and Zr and how CO2 and H2 are activated on the active sites remain unclear. Here, our research shows that there is a synergetic effect of dual active sites in the ZnO-ZrO2 catalyst for CO2 hydrogenation to methanol. In the 5%ZnO-ZrO2 catalyst, which has a low density of Zn-O-Zr sites, the dominant form of zinc coordination is as an isolated Zn site. The main coordination form of 20%ZnO-ZrO2 catalyst with moderate density of the Zn-O-Zr site is the (Zn)-O-Zr-O-(Zn) site. The main coordination form of 40%ZnO-ZrO2 catalyst with high density of the Zn-O-Zr site is (Zn)-O-(Zn) site. The catalyst with a Zn-O-Zr site of moderate density exhibits more efficient activation of H2 and CO2 and a lower energy barrier for the rate-determining step, which leads to superior catalytic activity. This work discovers the synergetic effect of the Zn-O-Zr sites in the ZnO-ZrO2 catalyst for CO2 hydrogenation to methanol and sheds light on the importance of the active site synergetic effect on multisite catalysts.

Bibliographic Details

Main Authors:	Wang, Jijie, Li, Shunning, Liu, Wei, Xiao, Yinguo, Feng, Zhendong, Liang, Xianhui, Tang, Shan, Li, Guanna, Dong, Cheng, Pan, Feng, Li, Can
Format:	Article/Letter to editor biblioteca
Language:	English
Subjects:	Life Science,
Online Access:	https://research.wur.nl/en/publications/the-synergetic-effect-of-dual-active-sites-in-zno-zro2-catalyst-f
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