Nickel-based CO hydrogenation catalyst, preparation method therefor and application of nickel-based CO hydrogenation catalyst

Abstract

The invention discloses a nickel-based CO hydrogenation catalyst, a preparation method therefor and an application of the nickel-based CO hydrogenation catalyst. The nickel-based CO hydrogenation catalyst is prepared from the ingredients, i.e., nickel oxide, aluminum oxide and auxiliaries, wherein the content of the nickel oxide accounts for 55% to 90% the total mass of the nickel-based CO hydrogenation catalyst, and the content of the auxiliaries accounts for 1% to 5% the total mass of the nickel-based CO hydrogenation catalyst; and the nickel oxide has the particle size of 3nm to 17nm. The nickel-based CO hydrogenation catalyst is prepared by adopting a coprecipitation method; through adding the auxiliaries of different kinds, improving an auxiliary adding mode and improving a drying process, the reaction activity of the catalyst is improved, and thus, the reaction temperature of a methanation reaction can be greatly lowered; and very high reaction activity and stability can be maintained under low-temperature conditions, so that the nickel-based CO hydrogenation catalyst can be applied to the complete removal of CO from hydrogen-enriched gases under the low-temperature conditions.

Description

technical field [0001] The invention relates to a CO hydrogenation reaction catalyst, in particular to a nickel-based CO hydrogenation reaction catalyst and a preparation method and application thereof. Background technique [0002] In the industrial installation of naphtha cracking to ethylene, the hydrogen-rich gas separated from the cold box inevitably contains CO and CO 2 , the concentration of CO gas is about 5000ppm, CO 2 The concentration of the gas is about 100ppm. This part of CO gas can poison and deactivate C2, C3 and pyrolysis gasoline hydrogenation catalysts. Therefore, the CO content in the hydrogen-rich gas provided for downstream devices must meet the requirements of hydrogenation catalysts, that is, less than 1ppm. [0003] At present, the methanation method is generally used in the industry to remove CO in hydrogen-rich gas, that is, hydrogenation reaction occurs between CO and hydrogen in hydrogen-rich gas to generate methane that is not toxic to hydrogen...

AI Technical Summary

Problems solved by technology

Generally, most of the CO hydrogenation reaction catalysts used in industry need to react at a reaction temperature of 280-350°C, so a large amount of high-pressure steam is required to heat the hydrogen-rich gas to the reaction temperature, which not only consumes a large amount of high-pressure steam, but also High requirements on reaction equipment, high operational risk, easy to cause high temperature interlock

[0004] In the prior art, in order to solve these technical problems, Chinese patent CN101607198A discloses a CO selective methanation catalyst and its preparation method. The methanation catalyst uses ammonia as a precipitant to precipitate nitrates of Ce and Zr, Then it is prepared by drying twice and roasting twice, and it can be reacted at a reaction temperature of 220-300°C; however, the methanation catalyst uses Ru as an active component, and the production cost is high and the preparation method is complicated , and the catalytic activity is low, the stability is poor, and the reaction temperature is still high

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