4.8 Article

Manganese Oxide Modified Nickel Catalysts for Photothermal CO Hydrogenation to Light Olefins

Journal

ADVANCED ENERGY MATERIALS
Volume 10, Issue 5, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902860

Keywords

Fischer-Tropsch synthesis; light olefins; manganese oxide; Ni-based catalysts; photothermal

Funding

  1. National Key Projects for Fundamental Research and Development of China [2016YFB0600901, 2018YFB1502002, 2017YFA0206904, 2017YFA0206900]
  2. National Natural Science Foundation of China [51825205, 51772305, 51572270, U1662118, 21871279, 21802154, 21902168]
  3. Beijing Natural Science Foundation [2191002, 2182078, 2194089]
  4. Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
  5. Royal Society Newton Advanced Fellowship [NA170422]
  6. International Partnership Program of Chinese Academy of Sciences [GJHZ1819, GJHZ201974]
  7. Beijing Municipal Science and Technology Project [Z181100005118007]
  8. K. C. Wong Education Foundation
  9. Youth Innovation Promotion Association of the CAS
  10. Energy Education Trust of New Zealand
  11. University of Auckland Faculty Research Development Fund
  12. MacDiarmid Institute for Advanced Materials and Nanotechnology

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Ni-based catalysts are traditionally considered unsuitable for the Fischer-Tropsch syntheses of olefins, due to the very strong hydrogenation ability of metallic Ni. Herein, this paradigm is challenged. A series of MnO supports nickel catalysts (denoted herein as Ni-x) are fabricated by H-2 reduction of a nickel-manganese mixed metal oxide at temperatures (x) ranging from 250 to 600 degrees C. The Ni-500 catalyst displays unprecedented performance for photothermal CO hydrogenation to olefins, with an olefin selectivity of 33.0% under ultraviolet-visible irradiation. High-resolution transmission electron microscopy, X-ray absorption spectroscopy (XAS), and X-ray diffraction analyses reveal that the Ni-x catalysts contain metallic Ni nanoparticles supported by MnO. X-ray photoelectron spectroscopy and XAS establish that electron transfer from MnO to the Ni-0 nanoparticles is responsible for modifying the electronic structure of nickel (creating Ni delta- states), thereby shifting the CO hydrogenation selectivity toward light olefins. Further, density functional theory calculations show that this electron transfer lowers the adsorption energies of olefins on Ni surfaces, thus minimizing the undesirable deep hydrogenation reactions to higher alkanes. This study conclusively demonstrates that MnO-modified Ni-based catalyst systems can be highly selective for CO hydrogenation to light olefins.

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