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Dr. Oliver Y. Gutiérrez, Christoph Kaufmann and Dr. Johannes A. Lercher Influence of Potassium on the Synthesis of Methanethiol from Carbonyl Sulfide on Sulfided Mo/Al2O3 Catalyst ChemCatChem 3

Article first published online: 26 JUL 2011 | DOI: 10.1002/cctc.201100124

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Potassium is the answer: Adding potassium to the MoS2 catalyst is necessary to achieve a high activity and selectivity from CH3SH from H2S-containing syngas. Acting as adsorption centers, the surface potassium cations promote the disproportionation of carbonyl sulfide to CO2 and CS2, but hinder the O[BOND]C and C[BOND]S bond cleavage, which is the preferred reaction on the sulfur vacancies of MoS2.

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