Preparation method for synthesizing methanol catalyst

Abstract

The invention discloses a preparation method for synthesizing a methanol catalyst. The preparation method comprises the following steps: (1) dissolving a soluble salt of Cu into water to prepare a solution A, adding a sodium metaaluminate alkaline solution and the solution A into a reaction tank with pure water to perform gelatinizing reaction in a parallel flow mode at the same time, thereby obtaining slurry I; (2) dissolving a soluble salt of Zn into water to prepare a solution B, dropwise adding the sodium metaaluminate alkaline solution into the solution B to perform gelatinizing reaction,thereby obtaining slurry II; (3) uniformly mixing the slurry I with the slurry II, aging under a stirring condition, filtering after ageing is ended, and performing hydro-thermal treatment on obtained materials through water vapor, wherein urea is added during hydro-thermal treatment; and (4) washing, filtering, drying, roasting, tabletting and forming, thereby obtaining the catalyst. A utilization rate of active metal copper in a surface phase of the catalyst prepared by the method is high, copper and zinc distribution is more uniform, the catalyst is reasonable in pore structure, activity,selectivity and thermal stability of the catalyst are improved, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for synthesizing methanol, in particular to a method for preparing a catalyst for synthesizing methanol with high activity, high selectivity and good heat resistance. Background technique [0002] Methanol is an extremely important chemical raw material, which is widely used in organic synthesis, dyes, fuels, medicines, coatings and national defense industries. Its output ranks third in the world after synthetic ammonia and ethylene. In recent years, methanol demand and production capacity have been increasing Industrial development and continued growth. [0003] In industry, methanol is generally used to contain H 2 , CO, CO 2 Syngas is produced under certain conditions of pressure, temperature and presence of catalysts. At present, medium and low pressure gas phase methods are widely used in the world to synthesize methanol, and the catalysts used are basically mixed oxides of copper, zinc...

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Problems solved by technology

[0010] The method for synthesizing methanol catalysts introduced in the above-mentioned patents is achieved by adding new additives (inorganic additives and organic additives), changing the catalyst preparation process (one-step process to two-step or three-step process) or changing the Al precursor. Increase the specific surface area of ​​the catalyst, change the grain size of CuO, adjust the proportion of catalyst components, and improve the dispersion of active components, so as to solve the problems of low activity and selectivity and short life of copper-based catalysts. There are disadvantages such as complex process, uneven dispersion of active components, small content of active metals in the surface phase of the catalyst, and low density of active centers.

[0011] Al 2 o 3 In the copper-based catalyst, it not only acts as a skeleton, but also can disperse the active components in the catalyst. How to use the additive Al 2 o 3 Skeletal effect, so that the main active component copper and promoter zinc appear more on the surface of the catalyst, increase the number of active centers on the catalyst surface, increase the contact probability of the active component copper and the promoter zinc, and make the catalyst have a suitable pore distribution , to significantly improve the activity, selectivity or lifetime of existing catalysts, which are not covered by the above patents

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