Catalytic synthesis of methanethiol from CO/H2/H2S mixtures using α-Al2O3

Zhang, B, Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874 and Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 2004. Catalytic synthesis of methanethiol from CO/H2/H2S mixtures using α-Al2O3. New Journal of Chemistry 28 (4) , pp. 471-476. 10.1039/b312340p

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Abstract

Sustained synthesis of methanethiol from the reaction of CO/H 2/H2S mixtures is reported and discussed. Surprisingly, unmodified α-Al2O3 gives the best results for this reaction and methanethiol selectivities of > 98 at CO conversions of ca. 6 can be readily obtained (CO:H2:H2S = 4:5:1, 340°C, total pressure = 20 bar, 200 h-1). Reaction of CO+ H2 (CO:H2 = 1:1) in the absence of H2S using α-Al2O3 under comparable conditions gives a lower CO conversion (ca. 1.3) with significant selectivities to methane (20), methanol (28.5) and ethanol (21.1). When H2S is added to the synthesis gas feedstock, the product selectivity switches to sulfur-containing products, almost exclusively methanethiol, but some by-product thiophene is also observed. A range of other catalysts were also investigated (e.g., α-Al2O3, Cr2O3, Cr2O 3/Al2O3, Cu/Cr2O3) but all give inferior catalytic performance when compared with α-Al2O3. The mechanism of the synthesis of methanethiol is discussed, based on a modification of chain propagation in the Fischer-Tropsch synthesis reaction.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	aluminum oxide; carbon monoxide; chromium derivative; copper derivative; hydrogen; hydrogen sulfide; methane; methanethiol; methanol; sulfur; thiophene derivative, article; catalysis; catalyst; pressure; priority journal; synthesis
Additional Information:	cited By (since 1996) 6
Publisher:	Royal Society of Chemistry
ISSN:	11440546
Last Modified:	05 Jan 2023 14:16
URI:	https://orca.cardiff.ac.uk/id/eprint/10288

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