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Unveiling the contribution of Mo, V and W oxides to coking in catalytic glycerol oxidehydration


Unveiling the contribution of Mo, V and W oxides to coking in catalytic glycerol oxidehydration

Molecular Catalysis

Volume 516, November 2021, 111969
https://doi.org/10.1016/j.mcat.2021.111969

Freeman Bwalya   Kabwea  Jian Qiang  Zhonga   Wei Jun   Huanga    Cun Jun   Liab    Chun Hui    Zhouac
 

Abstract

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.
 

Graphical abstract

 

Highlights

 

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.
 

a
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
b
College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
c
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.


 



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