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In situ investigation on Co-phase evolution and its performance for Fischer-Tropsch synthesis over Nb-promoted cobalt catalysts

Abstract

Nb-promoted cobalt catalysts were prepared by incipient wetness impregnation method and characterized by ex/in situ XRD, in situ DRIFTS, N2 physisorption, TEM, EDS-Mapping, H2-TPR, CO/H2-TPD, and XPS. Its performance was investigated on a fixed bed reactor for Fischer-Tropsch synthesis (FTS). As regards the sample textures, niobium oxide (NbOx) can obviously reduce the BET surface areas and pore volume, and promote the formation of uniform cobalt particles with a smaller size. The presence of NbOx complexes can weaken the metal-support interaction, while it also makes Co3O4 species easily reducible to metallic cobalt and favours the formation of hexagonal close-packed cobalt phase, as certified by the results of H2-TPR and ex/in situ XRD. What’s more, NbOx can enhance the adsorption stability and amount of CO adsorbed at approximately actual FTS reaction condition, verified by the results of CO-TPD. In addition, NbOx complexes can be considered as a weak electron donor confirmed by the results of XPS, leading to a higher concentration of surface carbon species. According to the performance results, the selectivity to C5+ products increased to 89.3% from 85.6% and CO conversion was significantly increased to 94.1% from 70.7% with the Nb loadings increasing to 1.57 wt.% from zero. It is found that highly selective production of heavy hydrocarbons can be achieved at higher activity level over Nb-promoted cobalt catalysts.

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Publication details

The article was received on 03 Jul 2017, accepted on 08 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01325F
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    In situ investigation on Co-phase evolution and its performance for Fischer-Tropsch synthesis over Nb-promoted cobalt catalysts

    J. Huang, W. Qian, H. Zhang and W. Ying, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01325F

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