Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (9): 1549-1557.DOI: 10.1016/S1872-2067(17)62899-7

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Probing the catalytic behavior of ZnO nanowire supported Pd1 single-atom catalyst for selected reactions

Jia Xua, Yian Songa, Honglu Wua,b, Jingyue Liua   

  1. a Department of Physics, Arizona State University, Tempe, Arizona 85287, United States;
    b Institue of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China
  • Received:2017-05-23 Revised:2017-08-17 Online:2017-09-18 Published:2017-09-06
  • Contact: 10.1016/S1872-2067(17)62899-7

Abstract:

We have dispersed individual Pd atoms onto ZnO nanowires (NWs) as single-atom catalysts (SACs) and evaluated their catalytic performance for several selected catalytic reactions. The Pd1/ZnO SAC is highly active, stable, and selective towards CO2 for steam reforming of methanol to produce hy-drogen. This catalyst system is active for oxidation of CO and H2 but performs poorly for preferential oxidation of CO in hydrogen-rich stream primarily due to the strong competitive oxidation of H2 on ZnO supported Pd1 atoms. At ambient pressure, reverse water-gas-shift reaction occurs on the Pd1/ZnO SAC. This series of tests of catalytic reactions clearly demonstrate the importance of se-lecting the appropriate metal and support to develop SACs for catalytic transformation of molecules.

Key words: Single-atom catalyst, Palladium, Znic oxide nanowire, Steam reforming of methanol, Carbon monoxide oxidation, Hydrogenation