Silica-supported Pt-In intermetallic alloy for low-temperature reverse water–gas shift reaction

IF 3.9 2区化学 Q2 CHEMISTRY, PHYSICAL Molecular Catalysis Pub Date : 2025-02-01 DOI:10.1016/j.mcat.2025.114890

Jie Zhao, Ruixue Bao, Ruru Sun, Xiaolong Zhang, Tao Zhang, Chuanyi Wang

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Abstract

The reverse water–gas shift reaction (RWGS) has been regarded as an important route for CO₂ utilization. Because the RWGS reaction is a mildly endothermic and competitive reaction with CO₂ methanation, it is necessary to explore catalysts with high activity and selectivity at low reaction temperatures. Herein, we investigate the catalytic characteristic of silica-supported Pt-In alloy for RWGS reaction by comparing it with silica-supported Pt and In₂O₃-modified Pt. It is found that Pt-In/SiO₂ exhibits significantly higher activity than Pt/SiO₂ at reaction temperatures from 140 to 200 °C, and equivalent activities appear at 240 °C. Further raising the temperatures, the activity of Pt/SiO₂ increases rapidly. CO selectivity over Pt-In/SiO₂ is close to 100 % and higher than Pt/SiO₂ (∼95 %) under dynamic reaction mode, being attributed to the effective expelling of CO away from the Pt-In surface by CO₂ molecules and the decreased atomic hydrogen supply. Moreover, the formate and the redox pathways were followed over Pt-In/SiO₂ and Pt/SiO₂, respectively. Except for higher activity and selectivity to CO, In₂O₃-modified Pt exhibits the same catalytic pathways as Pt/SiO₂. The present work supplied a guide to explore efficient catalysts for RWGS reaction at low reaction temperatures.

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来源期刊

Molecular Catalysis Chemical Engineering-Process Chemistry and Technology

CiteScore

6.90

自引率

10.90%

发文量

700

审稿时长

40 days

期刊介绍： Molecular Catalysis publishes full papers that are original, rigorous, and scholarly contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms. The fields covered are: Heterogeneous catalysis including immobilized molecular catalysts Homogeneous catalysis including organocatalysis, organometallic catalysis and biocatalysis Photo- and electrochemistry Theoretical aspects of catalysis analyzed by computational methods