Investigation of the reaction pathway for synthesizing methyl mercaptan (CH₃SH) from H₂S-containing syngas over K–Mo-type materials

Abstract

The reaction pathway for synthesizing methyl mercaptan (CH3SH) using H2S-containing syngas (CO/H2S/H2) as the reactant gas over SBA-15 supported K–Mo-based catalysts.

Methyl mercaptan production – catalysts and processes

“…Generally, the CH 3 SH productivity sharply increases up to 350 °C, but after that, it slightly decreases, since at higher temperatures a large amount of by-products (particularly CH 4 ) are formed. 67,77,79,82,85,89,90 COS is mainly produced at 250-300 °C. At higher temperature, it is converted into CH 3 SH or decomposed into other by-products (see Scheme 7).…”

“…The selectivity to CH 3 SH was about 35% at 250 °C and 30% at 325 °C. When Co was added to the catalyst formula, the COS conversion increased and all individual reactions were accelerated 67. At 310 °C and 3 MPa, with KMoS/SiO 2 , the yield of CH 3 SH was 18%, whereas with CoKMoS/SiO 2 the yield of CH 3 SH reached 35%.…”

The nature of K-induced 2H and 1T’-MoS2 species and their phase transition behavior for the synthesis of methanethiol (CH3SH)

“…However, CH 3 OH should be produced from syngas (CO/H 2 ), and this multi-step reaction gives rise to the enhanced consumption of resource and energy. Considering that CO/ H 2 and H 2 S are simultaneously produced from coal gasification, and H 2 S can be enriched using low-temperature methanol washing technology, the one-step reaction approach from CO/H 2 /H 2 S can provide alternatives for the synthesis of CH 3 SH (Gutie ´rrez et al, 2011a;Lu et al, 2018Lu et al, , 2020aLu et al, , 2020b.…”

Role of Zirconia in Oxide-Zeolite Composite for Thiolation of Methanol with Hydrogen Sulfide to Methanethiol

“…As an important organic intermediate in the fields of pesticides, medicine, and animal feed, the most important application of methanethiol (CH 3 SH) is the production of methionine, an essential amino acid for humans and animals [ 1 , 2 , 3 , 4 , 5 , 6 ]. Based on the used raw materials and synthesis routes, the production process of CH 3 SH can be divided into the methanol–hydrogen sulfide method, methyl chloride–alkali sulfide method, alkali sulfide–dimethyl sulfate method, thiourea–dimethyl sulfate method, methanol–carbon disulfide method, high-sulfur syngas method, and other methods [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Among these, the methanol–hydrogen sulfide method has attracted considerable attention due to its higher conversion efficiency and product selectivity [ 26 , 27 , 28 ].…”