High space velocity sulfur resistant pre-shift catalyst and preparation method thereof

Abstract

The invention relates to a catalyst and concretely relates to a high-air speed sulfur-resistant pre-shift catalyst. The sulfur-resistant pre-shift catalyst utilizes magnesium, aluminum and titanium composite carriers, utilizes molybdenum, cobalt and nickel as active components and one or more of tungsten oxide, iron oxide, manganese oxide, copper oxide and magnesium oxide as active component assistants. The catalyst has high compressive strength, a good structure and activity stability, has a strong toxin adsorption and removal capability, has a high active ingredient utilization rate and is not easily lost. The invention also provides a preparation method of the catalyst. The preparation method has reasonable processes. The catalyst still has good activity and activity stability under conditions of high air speed transformation and even under the condition of a higher air speed, has a long use period and can realize toxin and ash adsorption and removal.

Description

technical field [0001] The invention relates to a catalyst, in particular to a high space velocity sulfur-resistant pre-shift catalyst and a preparation method thereof. Background technique [0002] The purpose of the sulfur-tolerant pre-shift process is to pre-shift the process gas to reduce the burden on the subsequent shift system, reduce the impact on the subsequent main shift catalyst caused by the instability of the process gas, and at the same time absorb the entrainment in the crude synthesis gas after gasification The ash and arsenic and other poisons play a certain protective role. The sulfur-tolerant shift catalyst used in this process is usually also called sulfur-tolerant pre-shift catalyst. Compared with the main shift catalyst, the amount of this type of catalyst is much less, so that under the same load conditions, the gas space velocity of the catalyst bed in the pre-shift furnace is uniform. It is much higher than that of the main converter catalyst, some ...

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Problems solved by technology

[0003] Due to the low gas space velocity of the conventional sulfur-tolerant shift catalyst, it is greatly affected by internal diffusion, and the active components of the catalyst are required to be evenly distributed to make the utilization rate high and prolong the service life of the catalyst; however, the pre-shift catalyst in the sulfur-tolerant pre-shift process When the service conditions change, the gas space velocity increases greatly, which is greatly affected by external diffusion, and when the gas space velocity reaches a certain value, the external diffusion influence dominates, and the sulfur-resistant pre-shift catalyst is still used in the preparation of the main shift catalyst. process, when the high air space velocity is affected by external diffusion, the utilization rate of the internal active components is greatly reduced, which affects the catalyst activity and activity stability to a certain extent

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