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Low-temperature catalytic decomposition of hydrogen sulfide into hydrogen and diatomic gaseous sulfur

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Abstract

The thermodynamics of three pathways of the hydrogen sulfide decomposition reaction is considered. In the thermal process, the gas-phase dissociation of hydrogen sulfide yields hydrogen and diatomic singlet sulfur. Over sulfide catalysts, the reaction proceeds via the formation of disulfane (H2S2) as the key surface intermediate. This intermediate then decomposes to release hydrogen into the gas phase, and adsorbed singlet sulfur recombines into cyclooctasulfur. Over metal catalysts, H2S decomposes via dissociation into surface atoms followed by the formation of gaseous hydrogen and gaseous triplet disulfur. The last two pathways are thermodynamically forbidden in the gas phase and can take place at room temperature only on the surface of a catalyst. An alternative mechanism is suggested for hydrogen sulfide assimilation in the chemosynthesis process involving sulfur bacteria. To shift the hydrogen sulfide decomposition equilibrium toward the target product (hydrogen), it is suggested that the reaction should be conducted at room temperature as a three-phase process over a solid catalyst under a layer of a solvent that can dissolve hydrogen sulfide and sulfur. In this case, it is possible to attain an H2S conversion close to 100%. Therefore, hydrogen sulfide can be considered as an inexhaustible source of hydrogen, a valuable chemical and an environmentally friendly energetic product.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    A. N. Startsev

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  1. A. N. Startsev
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Correspondence to A. N. Startsev.

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Original Russian Text © A.N. Startsev, 2016, published in Kinetika i Kataliz, 2016, Vol. 57, No. 4, pp. 516–528.

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Startsev, A.N. Low-temperature catalytic decomposition of hydrogen sulfide into hydrogen and diatomic gaseous sulfur. Kinet Catal 57, 511–522 (2016). https://doi.org/10.1134/S002315841604011X

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