Thermally Stable RuOx–CeO2 Nanofiber Catalysts for Low-Temperature CO Oxidation

  • Zhongqi Liu
    Zhongqi Liu
    Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    More by Zhongqi Liu
  • Yang Lu
    Yang Lu
    Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    More by Yang Lu
  • Matthew P. Confer
    Matthew P. Confer
    Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
  • Hao Cui*
    Hao Cui
    College of Artificial Intelligence, Southwest University, Chongqing 400715, China
    State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
    *Email: [email protected]
    More by Hao Cui
  • Junhao Li
    Junhao Li
    Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    More by Junhao Li
  • Yudong Li
    Yudong Li
    Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    More by Yudong Li
  • Yifan Wang
    Yifan Wang
    Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    More by Yifan Wang
  • Shane C. Street
    Shane C. Street
    Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
  • Evan K. Wujcik*
    Evan K. Wujcik
    Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    *Email: [email protected]
  • , and 
  • Ruigang Wang*
    Ruigang Wang
    Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, Alabama 35487, United States
    *Email: [email protected]
    More by Ruigang Wang
Cite this: ACS Appl. Nano Mater. 2020, 3, 8, 8403–8413
Publication Date (Web):July 23, 2020
https://doi.org/10.1021/acsanm.0c01815
Copyright © 2020 American Chemical Society
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Abstract

With the ever-growing concerns for sustainable energy production and clean air, developing highly efficient catalysts to eliminate exhaust emission pollutants is of vital importance. In this work, we report a class of thermally stable RuOx–CeO2 nanofiber catalysts derived from a facile one-pot electrospinning method. Ru–CeO2 nanofiber catalysts exhibit outstanding low-temperature activity (∼90% conversion of CO below 150 °C) and long-term durability. The as-prepared Ru–CeO2 nanofiber catalysts show a high Brunauer–Emmett–Teller (BET) surface area (>110 m2/g), demonstrating the effectiveness of electrospinning for fabricating high-surface-area catalysts. The Ru–CeO2 nanofiber catalysts have a hollow interior and porous exterior structure, particularly at the Ru–CeO2 nanofiber interfaces, providing plentiful accessible CO and oxygen adsorption sites, which are beneficial for CO catalytic oxidation. H2 temperature-programmed reduction (H2-TPR) was applied to probe the reducibility of the as-synthesized catalysts. The reduced Ru–CeO2 nanofiber catalysts exhibited hydrogen consumption near room temperature. The catalysts were further characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM) to explore the relationship between the microstructure and extraordinary low-temperature reducibility, as well as the CO oxidation activity. In addition, X-ray photoelectron spectroscopy (XPS), in situ CO-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and density functional theory (DFT) calculation were employed to investigate the chemical states of the active surface species and identify the gas adsorption and reaction sites.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsanm.0c01815.

  • Optimized Ru–CeO2(111) Cartesian coordinates in Angstroms; DOS of pure Ru–CeO2(111) and repaired Ru–CeO2(111); adsorption configurations for the Ru–CeO2(111)/CO system, Ru–CeO2(111)/O2 system, CeO2(111)/CO system, and CeO2(111)/ O2 system; TGA curves of Ce(NO3)3·6H2O, PVP (Mw = 1 300 000), and electrospun Ce(NO3)3/PVP precursor fibers (PDF)

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Cited By


This article is cited by 7 publications.

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  2. Dong Duan, Chunxi Hao, Gege He, Haiyang Wang, Wenyu Shi, Lumei Gao, Zhanbo Sun. Co3O4 Nanosheet/Au Nanoparticle/CeO2 Nanorod Composites as Catalysts for CO Oxidation at Room Temperature. ACS Applied Nano Materials 2020, 3 (12) , 12416-12426. https://doi.org/10.1021/acsanm.0c02922
  3. Desen Fu, Xiaoxia Wu, Beilei Cui, Yonghua Guo, Hua Wang, Jinyu Han, Qingfeng Ge, Xinli Zhu. Ru 0.05 Ce 0.95 O 2 Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene. ChemCatChem 2021, 13 (22) , 4814-4823. https://doi.org/10.1002/cctc.202101239
  4. Stanley G. Feeney, Joelle M. J. LaFreniere, Jeffrey Mark Halpern. Perspective on Nanofiber Electrochemical Sensors: Design of Relative Selectivity Experiments. Polymers 2021, 13 (21) , 3706. https://doi.org/10.3390/polym13213706
  5. I. Hussain, A.A. Jalil, M.Y.S. Hamid, N.S. Hassan. Recent advances in catalytic systems in the prism of physicochemical properties to remediate toxic CO pollutants: A state-of-the-art review. Chemosphere 2021, 277 , 130285. https://doi.org/10.1016/j.chemosphere.2021.130285
  6. Yifan Wang, Zhongqi Liu, Matthew P. Confer, Junhao Li, Ruigang Wang. In-situ DRIFTS study of chemically etched CeO2 nanorods supported transition metal oxide catalysts. Molecular Catalysis 2021, 509 , 111629. https://doi.org/10.1016/j.mcat.2021.111629
  7. Wenming Liu, Shenyou Yang, Qiuli Zhang, Tianyao He, Yiwei Luo, Jinxiong Tao, Daishe Wu, Honggen Peng. Insights into flower-like Al2O3 spheres with rich unsaturated pentacoordinate Al3+ sites stabilizing Ru-CeOx for propane total oxidation. Applied Catalysis B: Environmental 2021, 281 , 120171. https://doi.org/10.1016/j.apcatb.2021.120171