Preparation method of methanol synthesis catalyst loaded on composite gel carrier

Abstract

The invention provides a preparation method of a methanol synthesis catalyst loaded on a gel carrier. The invention belongs to the technical field of catalyst preparation. The method comprises the steps of: preparing a Cu matrix and a Zn matrix by using a coprecipitation method; coprecipitating an aluminum salt solution with a composite precipitator composed of alkali and polyethylene glycol to obtain a sol solution; adding 1%-5% (wt.) of a gel inducer epoxypropane into the composite sol solution, and then carrying out aging treatment for 0.5-5 hours to finally obtain a composite gel carrier; loading the matrixes on the composite gel carrier to obtain catalyst slurry; and granulating and drying through spray drying, and finally, carrying out tableting molding on the roasted particles to obtain a finished product of the catalyst. The methanol synthesis catalyst prepared by the method provided by the invention has the advantages of large specific surface area, reduced total impurity content of crude alcohol, and better catalyst activity and thermal stability. The catalyst is suitable for preparing methanol from synthetic gas containing CO, CO2 and H2.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a methanol synthesis catalyst loaded on a composite gel carrier. Background technique [0002] With the gradual reduction of oil resources and the increasing shortage of fossil energy, the price of oil continues to rise. In the era of high oil prices, methanol as a basic chemical raw material and new energy has been paid more and more attention. The application fields of methanol are constantly expanding, and its demand is also expanding. The development of methanol industry has a good prospect. [0003] Methanol synthesis catalyst is one of the key technologies of methanol synthesis industry. [0004] The catalyst basically uses the Cu-Zn-Al system, in which copper and zinc oxides are called the active matrix, and alumina is the carrier. Alumina can be added in the form of finished alumina or aluminum hydroxide. [0005] At pre...

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Problems solved by technology

[0005] At present, there is also a method of co-precipitating aluminum hydroxide gel with alkaline precipitants such as ammonia water and sodium hydroxide and soluble aluminum salts. The colloidal carrier has a larger specific surface than the powder and solution carrier, but the ammonia water precipitant is used. It will produce relatively difficult ammonia nitrogen wastewater, which will have a certain impact on the environment; and the addition of sodium hydroxide will also cause Na in the catalyst 2 The increase of O content affects the activity and selectivity of the catalyst

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