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Preparation method of catalyst Cu-ZnO/HZSM-5 for directly synthesizing dimethyl ether by using synthesis gas

A technology of catalyst and dimethyl ether, which is applied in the field of preparation of catalyst Cu-ZnO/HZSM-5, which can solve the problems of insufficient catalyst uniformity and dispersion, harsh reaction conditions, and low conversion rate of carbon monoxide, etc., and achieve uniform particle size , Novel method, the effect of reducing waste and loss

Inactive Publication Date: 2011-12-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The homogeneity and dispersion of the prepared catalyst are not high enough, and there are problems such as the influence of impurity ions. Therefore, the activity of the prepared catalyst is limited and the requirements for the reaction conditions are harsh.
For example: in the above-mentioned patents, the pressure of direct synthesis of dimethyl ether from synthesis gas is mostly above 4.0MPa, the reaction temperature is generally higher than 250°C, the optimum working temperature is above 280°C or even higher, and the conversion rate of carbon monoxide in the reaction is low, The yield of dimethyl ether is low

Method used

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  • Preparation method of catalyst Cu-ZnO/HZSM-5 for directly synthesizing dimethyl ether by using synthesis gas
  • Preparation method of catalyst Cu-ZnO/HZSM-5 for directly synthesizing dimethyl ether by using synthesis gas
  • Preparation method of catalyst Cu-ZnO/HZSM-5 for directly synthesizing dimethyl ether by using synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Weigh 9.418 grams of copper nitrate trihydrate and 5.801 grams of zinc nitrate hexahydrate in a beaker, add 1200 milliliters of deionized water, stir to dissolve, then weigh 8.784 grams of urea and add it to the above mixture. After the urea dissolves, add 4.690 grams of HZSM-5 molecular sieve, and vigorously stir to form a uniform suspension, transfer the above suspension into a three-necked flask, continue to stir for 30 minutes, place the three-necked flask in an oil bath, stir at 100 degrees Celsius and Heating at reflux for 15-20 hours. When the pH of the suspension reaches 7.0, stop heating, immediately cool the suspension to room temperature, then filter under reduced pressure, wash with 200 ml of deionized water, and then dry in an oven at 80 degrees Celsius for 24 hours. Put it into a muffle furnace, raise the temperature to 350 degrees Celsius at 2 degrees Celsius / minute and bake it for 4 hours to obtain a Cu-ZnO / HZSM-5 catalyst with a weight ratio of (copper o...

Embodiment 2

[0038] Referring to the preparation method and steps of Example 1, the difference is that the amount of HZSM-5 is 3.126 grams. A Cu-ZnO / HZSM-5 catalyst with a (copper oxide+zinc oxide) / HZSM-5 weight ratio of 1.5:1 was obtained.

[0039] The carbon monoxide hydrogenation activity of the catalyst was evaluated by the same method and conditions. The conversion rate of reactant under different temperatures and the selectivity of product are as shown in table 2:

[0040] Table 2 Activity Evaluation Results of Catalysts in Embodiment 2

[0041]

Embodiment 3

[0043] Referring to the preparation method and steps of Example 1, the difference is that the amount of HZSM-5 is 2.680 grams. A Cu-ZnO / HZSM-5 catalyst with a (copper oxide+zinc oxide) / HZSM-5 weight ratio of 1.75:1 was obtained.

[0044] The carbon monoxide hydrogenation activity of the catalyst was evaluated by the same method and conditions. The conversion rate of reactant under different temperatures and the selectivity of product are as shown in table 3:

[0045] Table 3 Activity Evaluation Results of Catalysts in Embodiment 3

[0046]

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Abstract

The invention relates to a preparation method of a catalyst Cu-ZnO / HZSM-5 for directly synthesizing dimethyl ether by using synthesis gas. The catalyst is prepared from Cu(NO)2.3H2O, Zn(NO)2.6H2O and HZSM-5(Si / Al=22) molecular sieves used as raw materials by a chemical homogeneous precipitation method. The utilized raw materials are nitrate and urea, and are inexpensive and easily obtained, no foreign ion is generated in reaction, trivial filter cake washing is not needed, and a pure catalyst with uniform particles and favorable dispersion can be obtained through high temperature baking. The invention has simple processes and novel method; and in a reaction that hydrogen is directly added into carbon monoxide to generate the dimethyl ether, the catalyst has very high activity and stability at the low temperature of 220-240 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a catalyst Cu-ZnO / HZSM-5 for directly synthesizing dimethyl ether from synthesis gas. Background technique [0002] Dimethyl ether (molecular formula: CH 3 OCH 3 , Molecular weight: 46) is an excellent solvent, which can be used as insecticide, polishing agent, antirust agent, alkylating agent, and can also be used in aerosol, hair spray, air freshener, civil fuel, etc. Methyl ether has a high cetane number (55-60), good combustion performance, and low exhaust pollution during combustion. Therefore, DME has outstanding advantages as an alternative fuel for diesel engines. At the same time, dimethyl ether is also a very good environment-friendly refrigerant. Compared with traditional chlorofluorocarbons, it has no damage to the ozone layer and has a small greenhouse effect coefficient. Therefore, dimethyl ether is known as a clean energy source in the 21st century. . [0003] At present, there are two...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46C07C43/04C07C41/09C07C41/01
Inventor 聂仁峰侯昭胤王帅费金华郑小明
Owner ZHEJIANG UNIV