Research ArticleChemistry

Surrounded catalysts prepared by ion-exchange inverse loading

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Science Advances  13 May 2020:
Vol. 6, no. 20, eaay7031
DOI: 10.1126/sciadv.aay7031
  • Fig. 1 Schematic of different preparation methods.

    Schematic diagram of the traditional preparation method (A) and ion-exchange inverse loading (IEIL) method (B).

  • Fig. 2 Schematic and microscopic characterizations of catalysts.

    (A) Schematic diagram toward the synthesis of peapod-like Ni@Al2O3-IE surrounded catalyst via the IEIL method. Transmission electron microscopy images of (B) Ni(OH)2 precursor, (C) NiAl-MMH, (D) NiO@Al2O3-IE, (E and F) Ni@Al2O3-IE, and (G) x-ray diffraction patterns of the different products. a.u., arbitrary units.

  • Fig. 3 Detailed structure characterizations of catalysts.

    Schematic diagrams of the proposed formation process of Ni@Al2O3-IE (A to D) and Ni/Al2O3-IM (E to G). (H) Nitrogen sorption isotherms and the pore-size distribution (inset) of Ni@Al2O3-IE (Standard temperature pressure, STP). H2 temperature-programmed reduction profiles (I) and Ni 2p (J) and Al 2p (K) x-ray photoelectron spectra of Ni@Al2O3-IE and Ni/Al2O3-IM.

  • Fig. 4 Catalytic performance of catalysts.

    (A and B) CO conversion and (C and D) CH4 yield of Ni/Al2O3-IM and Ni@Al2O3-IE.

  • Fig. 5 Schematic, characterizations and performances of catalysts.

    (A) Schematic diagram toward the synthesis of Ni@CeO2-IE surrounded catalyst via the IEIL method. (B and C) TEM images of Ni@CeO2-IE (Ce/Ni molar ratio of 0.02). (D) Catalytic performances of Ni/CeO2-IM and Ni@CeO2-IE catalysts. (E) TOF as a function of surface Ni concentration and Ce3+/(Ce3+ + Ce4+) ratio. (F) The possible synergic catalysis mechanism on Ni@CeO2-IE surrounded catalyst.

  • Fig. 6 Schematic diagram toward the synthesis of surrounded Ni@Cu-IE catalyst via the IEIL method.

Supplementary Materials

  • Supplementary Materials

    Surrounded catalysts prepared by ion-exchange inverse loading

    Panpan Hao, Mingjiang Xie, Shanyong Chen, Muhong Li, Feifei Bi, Yu Zhang, Ming Lin, Xiangke Guo, Weiping Ding, Xuefeng Guo

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