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Enhanced production of C2-C4 alkanes from syngas via the metal sulfides-support interaction over Ni-MoS2/Ce1-xLaxO2-δ

Abstract

Direct conversion of syngas for selective production of light alkanes (C2-C4), driven by the demand for renewable petrochemicals and fuels, is promising but challenging due to the low selectivity. This study reports construction of an interaction among the metal (Ni-Mo) sulfides and support (Ce1-xLaxO2-δ) serves to appreciably enhance the target alkane selectivity without a severe loss of catalytic activity or stability. Characterization measurements (e.g., XPS, TEM-EDX, TPR, TPR-S, TPS, CO-TPD, Raman and in-situ DRIFT of CO adsorption) demonstrates the interaction between Ni and MoS2 generated the active NiMoS phase, which facilitated the C-C chain growth, achieving up to 75.9% selectivity of C2-C4 alkanes at a CO conversion of 25.1%. Monolayer dispersed sulfide species (NiMoVOxSy-II) in strong interaction with the support, generated via the low-temperature sulfidation, was favorable for the CO adsorption and delivered higher conversion rates relative to the conditional multi-stacked metal sulfides. This work establishes tuning the interaction between the metal sulfides and support as an alternative means to selectively produce C2-C4 alkanes in the direct conversion of syngas.

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Supplementary files

Article information


Submitted
30 Mar 2020
Accepted
22 May 2020
First published
22 May 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Enhanced production of C2-C4 alkanes from syngas via the metal sulfides-support interaction over Ni-MoS2/Ce1-xLaxO2-δ

J. Shen, M. Li, W. Li, S. Lin, Z. Hao, X. Chang, J. Lv and X. Ma, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0CY00629G

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