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Solid-phase hydrogen in magnesium-carbon composite for efficient hydrogenation of carbon disulfide

Abstract

Desulfurization of syngas from coal gasification is an essential process for chemical synthesis to achieve the high value-added utilization of coal. Hydrogenation conversion method is known for its high desulfurization degree in organic sulfur removing, but it is hindered by severe operation conditions, which leads to low safety and low efficiency. Mg-carbon composite is synthesized by reactive ball-milling method to store solid-phase hydrogen with high activity for CS2 hydrogenation. Without the presence of high-pressure gaseous hydrogen, CS2 in the stream is hydrogenated by the composite at 250 oC to yield CH4 and H2S, and the conversion is kept over 91.8% in 300 min. First-principles calculations reveal that chemisorption structures can influence the reaction path of CS2 with MgH2, in which horizontal chemisorption is in favor of the generation of gaseous H2S while vertical chemisorption can result in solid MgS. This new method of hydrogenation paves a pathway for organic sulfur compounds removal at moderate temperatures without using high-pressure hydrogen atmosphere.

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Publication details

The article was received on 22 Oct 2017, accepted on 10 Jan 2018 and first published on 11 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09289J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Solid-phase hydrogen in magnesium-carbon composite for efficient hydrogenation of carbon disulfide

    H. Chen, Z. Han, X. Feng, P. Liu, J. Liu, G. Liu, W. Yuan, T. Ren and S. Zhou, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA09289J

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