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Stable and antisintering tungsten carbides with controllable active phase for selective cleavage of aryl ether C-O bonds

Fang, Huihuang, Chen, Weikun, Wu, Lijie, Zhao, Pu, Roldan Martinez, Alberto and Yuan, Youzhu 2021. Stable and antisintering tungsten carbides with controllable active phase for selective cleavage of aryl ether C-O bonds. ACS Applied Materials and Interfaces 13 (7) , pp. 8274-8284. 10.1021/acsami.0c19599
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Abstract

Transition-metal carbides are important materials in heterogeneous catalysis. It remains challenging yet attractive in nanoscience to construct the active phase of carbide catalysts in a controllable manner and keep a sintering-resistant property in redox reactions, especially hydroprocessing. In this work, an integrated strategy was presented to synthesize stable and well-defined tungsten carbide nanoparticles (NPs) by assembling the metal precursor onto carbon nanotubes (CNTs), wrapping a thin polymeric layer, and following a controlled carburization. The polymer served as a soft carbon source to modulate the metal/carbon ratio in the carbides and introduced amorphous carbons around the carbides to prevent the NPs from sintering. The as-built p-WxC/CNT displayed high stability in the hydrogenolysis of aryl ether C–O bond in guaiacol for more than 150 h. Its activity was more than two and six times higher than those prepared via typical temperature-programmed reduction with gaseous carbon (WxC/CNT-TPR) and carbothermal reduction with intrinsic carbon support (WxC/CNT-CTR), respectively. Our p-WxC/CNT catalyst also achieved high efficiency for selective cleavage of the aryl ether C–O bonds in lignin-derived aromatic ethers, including anisole, dimethoxylphenol, and diphenyl ether, with a robust lifespan.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 1944-8244
Date of First Compliant Deposit: 10 February 2021
Date of Acceptance: 28 January 2021
Last Modified: 01 Apr 2021 12:22
URI: http://orca.cf.ac.uk/id/eprint/138410

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