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Catalyst for preparing dimethyl ether as well as preparation method and application thereof

A catalyst and dimethyl ether technology, applied in the field of dual-function catalysts, can solve the problems of high reaction temperature, poor catalyst activity and stability, etc., and achieve the effects of uniform physical structure, inhibition of coking, high reactivity and product selectivity

Active Publication Date: 2012-07-25
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These bifunctional catalysts all have defects such as high reaction temperature, poor catalyst activity and stability, etc.

Method used

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  • Catalyst for preparing dimethyl ether as well as preparation method and application thereof

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preparation example Construction

[0033] 1) Preparation of catalyst precursor for methanol synthesis: the nitrate mixed solution of copper, zirconium, third component (one or two substances in lanthanum, manganese, cerium, titanium, iron, chromium, zinc) and sodium carbonate The solution is co-precipitated under the conditions of 40-90°C and pH=7.0-13.0, and the resulting precipitated solution is aged at 40-90°C for 1-6 hours, and the obtained slurry is the catalyst precursor for methanol synthesis; the nitrate is mixed with The mass ratio of copper, zirconium and the third component contained in the solution is 15-65:15-65:0.5-10.

[0034] 2) Preparation of zirconia-alumina mixed oxide precursor: Precipitate the salt solution of zirconium and aluminum and lye at 0-30°C and pH=7.0-13.0 in parallel flow, and add the obtained precipitation solution to the other collective The 5%-50% isopropanol solution is aged at 0-30°C for 4-24 hours, and the obtained slurry is the precursor of zirconia-alumina mixed oxide.

...

Embodiment 1

[0056] 48.4g Cu(NO 3 ) 2 ·3H 2 O, 53.4g ZrO(NO 3 ) 2 2H 2 O and 5.2g La(NO 3 ) 3 ·nH 2 O was dissolved in 600ml of distilled water to make a uniform and stable mixed solution, and mixed with sodium carbonate solution (weighing 50g of anhydrous Na 2 CO 3 Dissolved in 800mL deionized water) and co-precipitated by co-flow, so that the precipitates were evenly mixed. After the precipitation was complete, the precipitation solution was continued to age at 70°C for 2h, and the obtained slurry was the precursor of the methanol synthesis catalyst.

[0057] 13.9g ZrO(NO 3 ) 2 and 68.4g Al 2 (SO 4 ) 3 Dissolve in 300ml of distilled water, and precipitate with 15wt% sodium carbonate solution co-currently at 5°C and pH=7. After the precipitation is complete, add 100ml of isopropanol, age under in-situ conditions for 12 hours, and then filter to obtain a solid sample. Wash the obtained solid sample and add it to the prepared methanol synthesis catalyst precursor slurry, stir ...

Embodiment 2

[0059] With embodiment 1, just with 48.4g Cu (NO 3 ) 2 ·3H 2 O was replaced by 96.8gCu(NO 3 ) 2 ·3H 2 O, to obtain a dimethyl ether synthesis catalyst.

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Abstract

The invention relates to a catalyst for preparing dimethyl ether. The catalyst is prepared by compounding a methanol synthesis catalyst precursor with a zirconia-aluminum oxide mixed oxide precursor, wherein the methanol synthesis catalyst precursor is prepared by adopting a coprecipitation method; and particularly, the catalyst is prepared by the steps of: adding the zirconia-aluminum oxide mixed oxide precursor to the methanol synthesis catalyst precursor, uniformly stirring and mixing, drying and calcining to prepare the bifunctional catalyst for synthesizing dimethyl ether, which is homogeneous in composition and structure. According to the invention, the preparing process of the catalyst is simple and good in repeatability; and when the catalyst is used for synthesizing dimethyl ether by co-hydrogenation of carbon monoxide carbon dioxide, the reaction conditions are mild, the catalytic activity is high and the stability is good, so that the problems of the traditional bifunctional catalyst system that the reaction activity is poor and two components interact are effectively solved.

Description

technical field [0001] The invention relates to a bifunctional catalyst for one-step preparation of dimethyl ether from biomass synthesis gas. [0002] The present invention also relates to a process for the preparation of the catalyst described above. [0003] The invention also relates to the application of the above-mentioned catalyst in the reaction of preparing dimethyl ether from biomass synthesis gas. Background technique [0004] Biomass energy is the only carbon resource that is renewable and can replace fossil energy into liquid and gaseous fuels and other chemical raw materials. By gasifying biomass at a higher temperature and using it to synthesize clean fuels, it can not only replace fuels such as coal, oil, and natural gas, but also increase farmers' income, reduce greenhouse gas emissions, and even ensure my country's future energy security. [0005] As an important chemical raw material and environmental protection product, dimethyl ether (DME) is widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/889B01J23/745B01J23/86C07C43/04C07C41/09
Inventor 吴晋沪李琢杨成李建青武景丽何涛苗鹏杰王利生
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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