Modified catalyst for preparing methyl mercaptan containing sulfur-containing synthesis gas and preparation method thereof

Abstract

The invention discloses a modified catalyst for preparing methyl mercaptan containing sulfur-containing synthesis gas and a preparation method thereof. The preparation method is characterized by comprising the steps of: using 5ml of ethanol water solution prepared by water and ethanol in a volume ratio of (0-1):1 by each gram of carrier SiO2; adding an unmodified catalyst Mo-O-K / A / SiO2 into the ethanol water solution; gradually adding 0.2-1ml of a precursor of a modification agent into each gram of the carrier under room-temperature agitation; continually agitating for 2-4 hours, and reflowing and agitating to react for 2-3 hours; and washing and filtering by the ethanol, and drying at 80-120 DEG C for 4-6 hours to obtain the catalyst Mo-O-K / A / SiO2. The modified catalyst Mo-O-K / A / SiO2 catalyst is added and the selectivity of a byproduct CO2 is reduced to be 0.76% from the previous lowest 30.96%; and the ratio of the selectivity of the product methyl mercaptan to the selectivity of the byproduct carbon dioxide is raised to be 19.03 from the previous highest 1.27.

Description

technical field [0001] The invention belongs to the technical field of catalysts for synthesizing methyl mercaptan, in particular to hydrogen sulfide-containing synthesis gas (CO+H 2 ) A modified catalyst for preparing methyl mercaptan and a preparation method thereof. Background technique [0002] Methyl mercaptan is an important chemical substance for the production of methionine, pesticides and medicine, and is currently mainly prepared by the reaction of methanol and hydrogen sulfide. Among the existing synthetic routes that have been disclosed, the one-step direct preparation of methyl mercaptan from hydrogen sulfide and synthesis gas is a very attractive solution. As disclosed in Chinese patent application CN1207957A, a kind of Mo-S-K / SiO used to prepare methyl mercaptan from synthesis gas containing high concentration hydrogen sulfide 2 Catalyst, in which the active component Mo-S-K group is formed by the precursor K 2 MoS 4 or (NH 4 ) MoS 4 It is transformed by...

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Problems solved by technology

[0003] In summary, for the process of producing methyl mercaptan from hydrogen sulfide-containing synthesis gas, the catalysts prepared by the prior art cannot effectively reduce the selectivity of the by-product carbon dioxide

So far, there has been no report on the use of modifiers to modify catalysts to suppress the generation of by-product carbon dioxide in the process of producing methyl mercaptan from hydrogen sulfide-containing synthesis gas

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