Freeman Bwalya KabweaJian Qiang ZhongaWei Jun HuangaCun Jun LiabChun Hui Zhouac
Mo, V and W oxides supported on montmorillonite (Mt) have shown good activity in catalytic glycerol oxidehydration. However, these catalysts deactivate rapidly due to coking. Understanding the role of Mo, V and W oxides in coke formation is essential to overcome the coking problem. Herein, individual and combination of Mo, V and W oxides supported on Mt were investigated to reveal the contribution of Mo, V and W oxides to coke formation. Among single metal oxide catalysts, Mo-Mt and W-Mt suffered more from coke formation than V-Mt. A mixture of Mo5+ and Mo6+ in the Mo-Mt catalyst hindered full oxidation during the oxidehydration, thus promoting coking. The oxidation of V4+ to V5+ helped diminish coke in mixed Mo-V-Mt and W-V-Mt. This work is expected to provide new information for designing high-performance Mo, V and W oxide catalysts with superior coke resistance.
The contribution of Mo, V and W oxides supported on Mt to coking was unveiled.
Quantitative analyses revealed that coke was predominantly formed in Mo-Mt and W-Mt catalysts.
Composition of Mo5+ and Mo6+ prior to the reaction hindered full oxidation to Mo6+.
Incorporation of V oxide in mixed Mo-V-Mt and W-V-Mt helped reduce coke.
Research Group for Advanced Materials & Sustainable Catalysis (AMSC), State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China
College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
Engineering Research Center of Non-metallic Minerals of Zhejiang Province, Zhejiang Institute of Geology and Mineral Resource, Hangzhou 310007, China
Received 3 August 2021, Revised 13 October 2021, Accepted 16 October 2021, Available online 8 November 2021.