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Preparation method of catalyst for directed preparing dimethyl ether by synthetic gas

A technology of dimethyl ether and synthesis gas, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation process, poor preparation repeatability, affecting catalyst activity, etc., and achieve high activity and synergy Strong effect, small particle size effect

Inactive Publication Date: 2003-04-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strict requirements on the temperature, acidity and alkalinity and the rate of addition of the solution in the catalyst preparation process, Na 2 CO 3 Na introduced when used as precipitant + Ions will affect the activity of the catalyst and need to be fully washed. Therefore, the preparation process is complicated and the preparation reproducibility is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Firstly, the commercial HZSM-5 is crushed to less than 200 meshes, roasted at 500°C for 2 hours, and then used. Weigh 7.25 grams of Cu(NO 3 ) 2 .3H 2 O, 4.46 g Zn(NO 3 ) 2 .6H 2 O and 1.29 g of Zr(NO 3 ) 4 .5H 2 O, dissolved in 150ml of absolute ethanol; then weighed 12.1 grams of oxalic acid and dissolved in 100ml of absolute ethanol. Under strong stirring, the ethanol solution containing oxalic acid was quickly added to the ethanol solution containing Cu, Zn and Zr ions, and a colloidal solution was formed immediately. The colloidal solution was placed under slight stirring for 1 hour, and then 3.4 grams of calcined HZSM-5 molecular sieves were added, and the stirring was continued for 1 hour. After centrifuging the precipitate, dry it in an oven at 110°C, and then bake it in a muffle furnace at a temperature of 360°C for 4 hours to obtain a catalyst powder for dimethyl ether synthesis. The particle catalyst of 20-40 mesh was crushed, wherein the molar ratio...

Embodiment 2

[0016] Embodiment 2: method, step and condition are the same as embodiment 1, just added 0.5625 gram of Al in the ethanolic solution of copper, zinc and zirconium 2 (NO 3 ) 3 .9H 2 O, and USY zeolite was used instead of HZSM-5 molecular sieve, the prepared colloid was washed twice with absolute ethanol, dried at 90°C, and burned at 400°C for an hour. The molar ratio of copper / zinc / zirconium / aluminum in the obtained catalyst is 10:5:1:0.5, and the weight ratio of oxide and molecular sieve is 1:1. The evaluation results of catalyst activity are shown in Table 2.

Embodiment 3

[0017] Embodiment 3: method, step and condition are the same as embodiment 1, just use 1.13 gram of Al in embodiment 2 2 (NO 3 ) 3 .9H 2 O replaced 1.29 g of Zr(NO 3 ) 4 .5H 2 O, and 1.7 g of HZSM-5 in 3.4 g with 1.7 g of Al 2 o 3 replace. The mol ratio of copper / zinc / aluminum in the gained catalyst is 10:5:1, oxide and (HZSM-5+Al 2 o 3 ) in a weight ratio of 1:1, and the activity evaluation results of the catalyst are shown in Table 3.

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Abstract

A process for preparing the catalyst used to prepare dimethylether directly from synthetic gas feattures that the nitrate containing Cu, Zn, and Al and / or Zr, where the atom ratio of Cu / Zn / Al+Zr is 1 / 0.4-0.7 / 0.03-0.3, it used as raw material and the solid acid is used as dewatering component, the ratio of synthetic component and dewatering component is 1:1-5:1 (weight ratio). Its advantages are simple process, small granularity, high specific surface area and high activity.

Description

technical field [0001] The present invention relates to a kind of synthesis gas (CO and H 2 ) The method for preparing a catalyst for directly producing dimethyl ether, specifically, relates to a method for preparing a dimethyl ether catalyst that contains Cu, Zn and other components and is fully mixed with a solid acid by using a colloidal deposition method. Background technique [0002] Dimethyl ether is a chemical product with a wide range of uses. It can replace chlorofluorocarbons as aerosol sprays and environmentally friendly refrigerants, and can also be used as an important raw material for the production of low-carbon olefins. Studies in recent years have shown that DME can be directly used as fuel as a substitute for liquefied petroleum gas and diesel. Therefore, the potential market of DME is undoubtedly very huge. [0003] At present, many patents and documents have announced the process of syngas one-step preparation of dimethyl ether. For example, US patents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J29/46
Inventor 贾美林徐恒泳李文钊于春英侯守福
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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