1. In situ generated oxygen vacancy on Nb2O5 for boosted catalytic activities of M/Nb2O5 in photothermal CO2 reforming of CH4.
- Author
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Li, Yuqiao, Guo, Jiawen, Liu, Huimin, Liu, Aidi, and Li, Dezheng
- Subjects
CATALYTIC activity ,METAL catalysts ,METHANE ,CARBON dioxide ,COBALT catalysts ,VISIBLE spectra ,FISCHER-Tropsch process - Abstract
Photothermal synergistic CO 2 reforming of CH 4 (CRM) is a promising avenue to convert the greenhouse gases (CO 2 and CH 4) into valuable chemicals and store the abundant clean solar energy into chemical energy simultaneously. Developing photothermal catalysts that could drive CRM efficiently at low temperatures remains as a challenge. In the present study, Nb 2 O 5 supported group VIII metal catalysts (M/Nb 2 O 5) were synthesized, with the typical catalyst Rh/Nb 2 O 5 recording a CO 2 conversion rate of 50.6 mmol g Rh
−1 min−1 in CRM at 500 °C under visible light irradiation, about double fold higher than that achieved under the thermal-driven reaction condition. Mechanism study disclosed that oxygen vacancy was generated in situ over M/Nb 2 O 5 under the CRM reaction atmosphere. The oxygen vacancy promoted CO 2 adsorption and enhanced the light harvesting capacities of M/Nb 2 O 5 catalysts, which ultimately boosted their activities in photothermal CRM. This study provides a promising pathway for the rational design of efficient catalysts by tailoring the properties of the catalysts under the reaction atmosphere. • Oxygen vacancies could be generated in situ over M/Nb 2 O 5 catalysts in CRM. • Oxygen vacancy promoted catalyst light harvesting capacity and the activation of CO 2. • M/Nb 2 O 5 catalysts recorded a higher performance in CRM with visible light assistance. [ABSTRACT FROM AUTHOR]- Published
- 2023
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