High-pressure low-sulfur-tolerant shift catalyst and preparation method thereof

Abstract

The invention belongs to the technical field of sulfur-tolerant shift in coal chemical industry, and particularly relates to a high-pressure low-sulfur-tolerant shift catalyst and a preparation methodthereof, wherein the catalyst comprises a carrier and an active component, the active component is selected from a binary component of cobalt oxide and molybdenum oxide, the raw materials of the carrier are selected from a magnesium-containing compound, an aluminum-containing compound, a titanium-containing compound and a heat-treated modified montmorillonite. According to the present invention,montmorillonite with characteristics of wide source and low cost is subjected to heat treatment modification to be used as the carrier component so as to reduce the catalyst preparation cost; the montmorillonite is subjected to heat treatment so as to avoid the treatment of the waste acid solution; the product is prepared by the mixing kneading method, such that the active components are uniformlydispersed in the carrier and are not easily lost so as to increase the activity stability of the catalyst; and compared with the impregnation method in the prior art, the method of the present invention has the following advantages that the water consumption is saved, the preparation process and the operation process are simplified, the cost advantage is remarkable, and the prepared catalyst hasgood shift activity and good activity stability under low sulfur condition, and further has good economic benefits and popularization and application prospects.

Description

technical field [0001] The invention belongs to the technical field of sulfur-resistant shifting in coal chemical industry, and in particular relates to a high-pressure low-sulfur-resistant shifting catalyst and a preparation method. Background technique [0002] Cobalt-molybdenum-based sulfur-tolerant shift catalysts have outstanding industrial application performance in the water-gas shift process due to their characteristics such as wide temperature range, high shift activity, good sulfur resistance and anti-poisoning performance. The active components of such catalysts are generally selected from group VIII and VIB metal compounds represented by cobalt and molybdenum, and the additives are generally selected from alkali metal, alkaline earth metal and rare earth metal compounds. Its carrier components are generally selected from industrial raw materials containing Mg, Al, Ti and other elements. Catalysts are generally prepared by co-precipitation, kneading or impregnati...

AI Technical Summary

Problems solved by technology

In some domestic coal chemical plants that use low-sulfur coal as the main raw material, there have been situations in which the activity of the catalyst decreased due to the low content of hydrogen sulfide during the operation process, resulting in the conversion outlet CO exceeding the standard.

Especially for the coal gasification gasification process with high pressure (≥4.0MPa), high CO content (≥42%), and high water-gas ratio (1.0-1.5), the existing industrial sulfur-tolerant shift catalysts can be used in a high-temperature stage due to the process Catalyst loss of sulfur and anti-sulfurization are prone to occur under the condition of low sulfur content in the gas, resulting in a decrease in catalyst activity and a shortened service life, especially in the later stage of operation. The low-sulfur resistance of the catalyst puts forward higher requirements

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