Syngas Conversion to C 2 Species over WC and M/WC (M = Cu or Rh) Catalysts: Identifying the Function of Surface Termination and Supported Metal Type

Improving the selectivity and activity of C species from syngas is still a challenge. In this work, catalysts with monolayer Cu or Rh supported over WC with different surface terminations (M/WC (M = Cu or Rh)) are rationally designed to facilitate C species generation. The complete reaction network...

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Veröffentlicht in:ACS applied materials & interfaces 2022-05, Vol.14 (17), p.19491-19504
Hauptverfasser: Zhao, Wantong, Guan, Zun, Li, Debao, Wang, Baojun, Fan, Maohong, Zhang, Riguang
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container_issue 17
container_start_page 19491
container_title ACS applied materials & interfaces
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creator Zhao, Wantong
Guan, Zun
Li, Debao
Wang, Baojun
Fan, Maohong
Zhang, Riguang
description Improving the selectivity and activity of C species from syngas is still a challenge. In this work, catalysts with monolayer Cu or Rh supported over WC with different surface terminations (M/WC (M = Cu or Rh)) are rationally designed to facilitate C species generation. The complete reaction network is analyzed by DFT calculations. Microkinetics modeling is utilized to consider the experimental reaction temperature, pressure, and the coverage of the species. The thermal stabilities of the M/WC (M = Cu or Rh) catalysts are confirmed by AIMD simulations. The results show that the surface termination and supported metal types in the M/WC (M = Cu or Rh) catalysts can alter the existence form of abundant CH ( = 1-3) monomer, as well as the activity and selectivity of CH monomer and C species. Among these, only the Cu/WC-C catalyst is screened out to achieve outstanding activity and selectivity for C H generation, attributing to that the synergistic effect of the subsurface C atoms and the surface monolayer Cu atoms presents the noble-metal-like character to promote the generation of CH and C species. This work demonstrates a new possibility for rational construction of other catalysts with the non-noble metal supported by the metal carbide, adjusting the surface termination of metal carbide and the supported metal types can present the noble-metal-like character to tune catalytic performance of C species from syngas.
doi_str_mv 10.1021/acsami.2c02217
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title Syngas Conversion to C 2 Species over WC and M/WC (M = Cu or Rh) Catalysts: Identifying the Function of Surface Termination and Supported Metal Type
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