Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (12): 1847-1853.DOI: 10.1016/S1872-2067(19)63411-X

• Communications • Previous Articles     Next Articles

Superior activity of Rh1/ZnO single-atom catalyst for CO oxidation

Bing Hana,b, Rui Langa, Hailian Tanga, Jia Xuc, Xiang-Kui Gud, Botao Qiaoa,e, Jingyue(Jimmy) Liuc   

  1. a CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China;
    c Department of Physics, Arizona State University, Tempe, Arizona 85287, United States;
    d Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, United States;
    e Dalian National Laboratory for Clean Energy, CAS, Dalian 116023, Liaoning, China
  • Received:2019-07-21 Revised:2019-08-30 Online:2019-12-18 Published:2019-09-21
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21606222, 21776270), Liaoning Revitalization Talents Program (XLYC1807068), DNL Cooperation Fund, CAS (180403) and US National Science Foundation under CHE-1465057.

Abstract: CO oxidation is of great importance in both fundamental study and industrial application. Supported noble metal catalysts are highly active for CO oxidation but suffer from the scarcity and high cost. Single-atom catalysts (SACs) can maximize the metal atom efficiency. Herein, ZnO nanowire (ZnO-nw) supported Rh, Au, and Pt SACs were successfully developed to investigate their CO oxidation performance. Interestingly, it was found that Rh1/ZnO-nw showed much higher activity than the other noble metals which are usually regarded as good candidates for CO oxidation. In addition, the Rh SAC possessed high stability in high-temperature CO oxidation under simulated conditions in the presence of water and hydrocarbons. The high activity and stability make Rh1/ZnO-nw promising for practical applications, especially in the automotive exhaust emission control. Theoretical calculations indicate that the CO oxidation proceeds via the Mars-van Krevelen mechanism and the lowest barrier for the rate-limiting O2 dissociation at a surface oxygen vacancy site is a key factor in determining the observed highest activity of Rh1/ZnO-nw amongst the studied SACs.

Key words: Single-atom catalysis, Carbon monoxide oxidation, Rhodium, Zinc oxide nanowire, Density functional theory calculations