4.8 Article

Highly active Pt/In2O3-ZrO2 catalyst for CO2 hydrogenation to methanol with enhanced CO tolerance: The effects of ZrO2

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 320, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apcatb.2022.122018

Keywords

CO2 hydrogenation; Methanol; CO tolerance; In2O3; Pt; Metal-support interaction; DFT study

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This study demonstrates high activity and enhanced CO tolerance for CO2 hydrogenation to methanol on Pt/In2O3-ZrO2 catalyst. The addition of ZrO2 enables stronger electron transfer between Pt and In2O3-ZrO2, leading to weaker CO adsorption and improved CO tolerance of Pt catalyst. The ZrO2-modified oxygen vacancy promotes CO2 activation.
The supported Pt catalyst is normally not active for CO2 hydrogenation to methanol at the presence of CO. Herein, ZrO2 is added into Pt/In2O3 for CO2 hydrogenation to methanol with CO as a co-feed gas. High activity with enhanced CO tolerance is achieved on Pt/In2O3-ZrO2. For example, the space-time yield of methanol reaches 0.569 g(methanol) g(cat)(-1) h(-1 )at 300 degrees C and 5 MPa under feed gas containing 4% CO of 21,000 cm(3).h(-1)g(cat)(-1). With the addition of ZrO2, a stronger electron transfer occurs between Pt and the In2O3-ZrO2 solid solution support. This leads to weaker CO adsorption, which suppresses over-reduction of In2O3 and enhances CO tolerance of the Pt catalyst. The oxygen vacancy of In2O3 modified by ZrO2 promotes CO2 activation. The synergy between Zrmodified oxygen vacancy (In-O-v-Zr) and Pt catalyst facilitates methanol synthesis from CO2 hydrogenation via formate route. This is different from Pt/In2O3, which takes CO hydrogenation route.

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