Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (7): 1830-1841.DOI: 10.1016/S1872-2067(21)64027-5

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Non-noble metal single-atom catalyst with MXene support: Fe1/Ti2CO2 for CO oxidation

Chun Zhua,b, Jin-Xia Lianga,b,*(), Yang-Gang Wangb, Jun Lib,c,#()   

  1. aSchool of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China
    bDepartment of Chemistry, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
    cDepartment of Chemistry, Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
  • Received:2021-12-12 Accepted:2021-12-30 Online:2022-07-18 Published:2022-05-20
  • Contact: Jin-Xia Liang, Jun Li
  • About author:Jun Li (Department of Chemistry, Tsinghua University) was invited to join the 5th and 6th Editorial Board of Chin. J. Catal. He received a PhD degree from Chinese Academy of Sciences in 1992 and then did postdoctoral research in Siegen University (Germany) and The Ohio State University (USA) from 1993 to 1997. He then worked as a Research Scientist, Senior Research Scientist, and Chief Scientist at The Ohio State University and Pacific Northwest National Laboratory (USA). He later joined the faculty at Tsinghua University as a ChangJiang Chair Professor. He works in the field of relativistic quantum chemistry, computational catalysis and cluster science, with more than 400 publications and some 40000 citations.
  • Supported by:
    National Science Foundation of China(21963005);National Science Foundation of China(21763006);National Science Foundation of China(22033005);Open Fund of Shaanxi Key Laboratory of Catalysis(SXKLC-2017-01);Guangdong Provincial Key Laboratory of Catalysis(2020B121201002);Guangdong “Pearl River” Talent Plan(2019QN01L353);Natural Science Foundation of Guizhou University([2021]40);Natural Science Foundation of Guizhou University([2020]32)

Abstract:

MXenes have attracted considerable attention owing to their versatile and excellent physicochemical properties. Especially, they have potential applications as robust support for single atom catalysts. Here, quantum chemical studies with density functional theory are carried out to systematically investigate the geometries, stability, electronic properties of oxygen functionalized Ti2C (Ti2CO2) supported single-atom catalysts M1/Ti2CO2 (M = Fe, Co, Ni, Cu Ru, Rh, Pd, Ag Os, Ir, Pt, Au). A new non-noble metal SAC Fe1/Ti2CO2 has been found to show excellent catalytic performance for low-temperature CO oxidation after screening the group 8-11 transition metals. We find that O2 and CO adsorption on Fe1 atom of Fe1/Ti2CO2 is favorable. Accordingly, five possible mechanisms for CO oxidation on this catalyst are evaluated, including Eley-Rideal, Langmuir-Hinshelwood, Mars-van Krevelen, Termolecular Eley-Rideal, and Termolecular Langmuir-Hinshelwood (TLH) mechanisms. Based on the calculated reaction energies for different pathways, Fe1/Ti2CO2 shows excellent kinetics for CO oxidation via TLH mechanism, with distinct low-energy barrier (0.20 eV) for the rate-determining step. These results demonstrate that Fe1/Ti2CO2 MXene is highly promising 2D materials for building robust non-noble metal catalysts.

Key words: Single-atom catalyst, Density functional theory, Ti2CO2 MXene, CO oxidation