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Catalyst of direct synthetic dimethyl ether and preparing method thereof

A technology of catalyst and dimethyl ether, which is applied in the field of catalyst for direct synthesis of dimethyl ether and its preparation, and can solve problems such as unfavorable equilibrium conversion rate

Inactive Publication Date: 2005-02-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks Al 2 o 3 The acidity of dimethyl ether is relatively weak, so when the catalyst prepared by this method is used for direct synthesis of dimethyl ether, the suitable temperature required for the reaction is relatively high, generally 260 ° C ~ 280 ° C, which is very important for the strong exothermic reaction of direct synthesis of dimethyl ether unfavorable balance conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The dosage of Cu is 10-25mmol / g carrier; the dosage of Mn is 5-20mmol / g carrier; Zn is used as the third active component, and the dosage is 1-15mmol / g carrier. (The above are the amount of substance). Weigh a certain amount of Cu(NO 3 ) 3 and Zn(NO 3 ) 2 , dissolved in deionized water and added a certain volume of Mn(NO 3 ) 2 solution, stirring vigorously until fully combined. The mixed solution and sodium carbonate solution are added dropwise as a precipitant solution, placed in a 50-80°C constant temperature water bath containing a certain amount of commercial molecular sieve suspension, and the pH value of the suspension is maintained at 6-8. After the precipitation is complete, it is statically aged at room temperature for 4-8 hours, filtered and washed until there is no sodium ion, dried at 120°C, and roasted at 300-700°C for 4-8 hours. Then, tablet, crush, and sieve 20-40 mesh catalysts for the reaction of synthesis gas to directly synthesize dimethyl ethe...

Embodiment 2

[0015] Weigh a certain amount of Cu(NO 3 ) 3 and Zn(NO 3 ) 2 , dissolved in deionized water and added a certain volume of Mn(NO 3 ) 2 solution, stirring vigorously until fully combined. Mix this mixed solution with 1.0mol / L Na 2 CO 3 The solution is added dropwise in parallel, placed in a 50-80°C constant temperature water bath containing a certain amount of commercial molecular sieve suspension, and the pH value of the suspension is maintained at 6-8. After the precipitation is complete, it is statically aged at room temperature for 4 to 8 hours, filtered and washed until there is no sodium ion, dried at 120°C, and roasted at 300°C to 700°C for 4 to 8 hours. Then, tablet, crush, and sieve the 20-40-mesh catalyst for evaluation. The activity and selectivity are shown in Table 1.

Embodiment 3 to Embodiment 7

[0017] The amount ratio (mass ratio) of Cu / (Mn+Zn) gradually increased from 2 / 3 to 2, and the preparation method was the same as in Example 1, and the evaluation results of its activity and selectivity are shown in Table 1.

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PUM

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Abstract

A catalyst Cu-Mn-Zn / carrier for directly synthesizing dimethylether is composed of the active components Cu, Mn and Zn and carrier. Its advantages are lower reaction temp and pressure, and high transform rate of Co and output rate of dimethylether.

Description

technical field [0001] The invention relates to a catalyst for directly synthesizing dimethyl ether from synthesis gas and a preparation method thereof. Background technique [0002] DME has many unique uses in aerosols, pharmaceuticals, pesticides, fuels, and daily chemical products. Especially as a clean alternative fuel for diesel, it has good combustion performance, high cetane number and low ignition temperature, and can greatly reduce NO in the tail x emissions, reduce vehicle noise, and can achieve smokeless combustion under any working conditions, which is close to the emission standards that will be implemented in Europe in 2005. Therefore, the production of dimethyl ether has a good market prospect. [0003] Catalysts for the direct synthesis of dimethyl ether from synthesis gas, in the patent literature of dimethyl ether synthesis catalysts that have been reported, are generally composed of copper and zinc metal active components that play a role in synthesizing...

Claims

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Application Information

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IPC IPC(8): B01J29/076B01J37/03C07C41/01C07C43/04
Inventor 费金华杨明霞侯昭胤楼辉郑小明
Owner ZHEJIANG UNIV
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