Chinese Journal of Catalysis ›› 2023, Vol. 52: 1-13.DOI: 10.1016/S1872-2067(23)64505-X
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Sikai Wanga,b,1, Xiang-Ting Minc,1, Botao Qiaoc,d, Ning Yana,b,*(), Tao Zhangc,d,e,*()
Received:
2023-07-14
Accepted:
2023-08-21
Online:
2023-09-18
Published:
2023-09-25
Contact:
*E-mail: About author:
Ning Yan (Department of Chemical & Biomolecular Engineering, National University of Singapore) currently holds a Dean’s Chair Professorship at National University of Singapore. He received his B.Sc. and Ph.D. degrees in chemistry from Peking University (China) in 2004 and 2009, respectively (supervisor: Prof. Yuan Kou). Then he joined the École Polytechnique Fédérale de Lausanne in Switzerland with a Marie Curie Fellowship until 2012 (collaborator: Prof. Paul Dyson). After that, he started working in the Department of Chemical and Biomolecular Engineering in National University of Singapore and was promoted to a tenured associate professor in 2018. He received NRF Investigatorship Award (2022), NUS Young Researcher Award (2019), ACS Sustainable Chemistry & Engineering Lectureship Award (2018), and RSC Environment, Sustainability and Energy Early Career Award (2017), among others. His research interests lie in advanced heterogeneous catalysis, green chemistry & engineering, and renewable energy & chemical production, with over 200 published peer-reviewed papers.Sikai Wang, Xiang-Ting Min, Botao Qiao, Ning Yan, Tao Zhang. Single-atom catalysts: In search of the holy grails in catalysis[J]. Chinese Journal of Catalysis, 2023, 52: 1-13.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64505-X
Fig. 1. Statistics of published articles about adopting SACs for direct conversion of methane, water, carbon dioxide and nitrogen into value-added chemicals via thermo-catalysis, electrocatalysis or photo(electro)catalysis (using Scopus database, data collected on 30th June 2023).
Fig. 2. Single atom catalysts for direct methane conversion. (a) Scheme of proposed reaction pathway for partial oxidation of CH4 with O2 and H2 over PdCu/Z-5. Reprinted with permission from Ref. [31]. Copyright 2022, John Wiley and Sons. (b) Reaction pathway for partial oxidation of methane over Au1/BP nanosheets under light irradiation. The inset images show the side views of the configurations. Yellow, violet, pink, red, gray, and white spheres refer to Au, surface P, subsurface P, O, C, and H atoms, respectively. Reprinted with permission from Ref. [37]. Copyright 2021, Springer Nature. (c) Schematic showing selective photo-activation of CH4 to CH3OH over PMOF-RuFe(OH) in the presence of O2, H2O and irradiation (hν). (d) Comparison of the methane oxidation activity over various catalysts in batch mode. Reaction conditions: 3 mL water, 20 h visible light, 10 mg catalyst and CH4/O2 (1 atm). Figs. (c) and (d) are reprinted with permission from Ref. [39]. Copyright 2022, Springer Nature. (e) Free-energy profiles of intermediates and transition states for methane activation and transformation on Fe1?SiC2 active center. Reprinted with permission from Ref. [51]. Copyright 2020, John Wiley and Sons. (f) Comparison of nonoxidative methane conversion activity and product selectivity at 975 °C over the different catalysts and controls. Reprinted with permission from Ref. [52]. Copyright 2018, American Chemical Society. (g) Time-dependent photocatalytic C2H6 and C2H4 production over ZnO-AuPd2.7%. Reprinted with permission from Ref. [60]. Copyright 2021, American Chemical Society.
Fig. 3. Selected SACs systems very recently for artificial photosynthesis. (a) H2 evolution rates of the CN@CuS, Pt@CN@CuS and Pt1-CN@CuS. Reprinted with permission from Ref. [77]. Copyright 2020, John Wiley and Sons. (b) UV/Vis-NIR DRS spectra of prepared samples. (c) H2 evolution tests of prepared samples under visible light irradiation (λ > 430 nm) at 30 °C. Figs. (b) and (c) are reprinted with permission from Ref. [81]. Copyright 2022, John Wiley and Sons. (d) Mass distributions of C60V+, C60VO+, and C60V+(H2O) produced via laser vaporization, with and without IR irradiation at 1190 cm-1. (e) IRMPD spectrum of C60V+(H2O) and calculated spectra of C60V+(H2O) with η5 and η6. Figs. (d) and (e) are reprinted with permission from Ref. [82]. Copyright 2021, John Wiley and Sons. (f) Photocatalytic CO evolution over different Fe catalyst. Reprinted with permission from Ref. [88]. Copyright 2022, American Chemical Society. (g) Gas yield and selectivity towards methane for PCN‐Cu SACs, PCN‐Ru SACs and PCN‐RuCu SACs. (h) Schematic of the possible photocatalytic mechanism of PCN‐RuCu for photocatalytic CO2 reduction under light illumination. Nitrogen, carbon, ruthenium and copper atoms are shown in blue, gray, green and pale red, respectively. Figs. (g) and (h) are reprinted with permission from Ref. [90]. Copyright 2022, Elsevier B. V. (i) Production rates of CH4 and CO of CO2 photoreduction for Pd1/C3N4, Pd1+NPs/C3N4, and PdNPs/C3N4. (j) The reaction mechanism for photoreduction of CO2 to CH4 over Pd1+NPs/C3N4. Figs. (i) and (j) are reprinted with permission from Ref. [91]. Copyright 2022, John Wiley and Sons.
Fig. 4. N2 hydrogenation pathway on the steady-state Co1-N3.5 sites (represented by A) (a) and dynamic cyclic sites (CoN6?x/C) (b). Figs. (a) and (b) are reprinted with permission from Ref. [100]. Copyright 2020, Springer Nature. (c) Molecular orbital diagram of N2 and proposed Fe spin configurations in FeN4 and FeN3S1. Reprinted with permission from Ref. [104]. Copyright 2022, John Wiley and Sons. (d) DFT-calculated optimized free energy pathways for NRR on FeS2O2, FeS1O3, FeS1O2 and FeO3 coordination configurations, respectively. Reprinted with permission from Ref. [105]. Copyright 2022, John Wiley and Sons. (e) Diagrams of the nitrogen π* 2p orbital and the electron transfer from La to the adsorbed nitrogen. Reprinted with permission from Ref. [109]. Copyright 2022, Elsevier B. V.
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