Methanol synthesizing catalyst and its prepn

A technology for synthesizing methanol and catalysts, applied in catalyst activation/preparation, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve problems such as lower conversion rate, achieve simple preparation, high activity and selectivity, and easy industrialization

Inactive Publication Date: 2006-08-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0004] Synthetic methanol catalysts in the prior art are mainly suitable for CO depleted 2 Syngas of the system, rich in CO 2 In the gas system, the conversion rate is reduced

Method used

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Examples

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Embodiment Construction

[0014] Take the Cu, Zn, Al, Li nitrate mixed solution that the total concentration is 1.0mol / L (wherein the molar ratio Cu:Zn:Al:Li=6:3:1:0.5) is placed in the separatory funnel, take 1.0mol / LNa 2 CO 3 The solution is placed in another separatory funnel, and the two are titrated into a small amount of deionized water stirred at a high speed while keeping the pH of the solution between 7-8; aging for 2 hours after titration, suction filtration, washing and drying The catalyst precursor was obtained, which was dried at 110° C. for 12 hours, and then calcined at 350° C. for 3.5 hours. Denote it as Cat1.

[0015] As a comparison, Cu-Zn-Al methanol synthesis catalyst with a molar ratio of 6:3:1 was prepared by co-precipitation method. Take the nitrate mixed solution of Cu, Zn, Al (wherein the molar ratio Cu:Zn:Al=6:3:1) that the total concentration is 1.0mol / L and place it in the separating funnel, take 1.0mol / L Na 2 CO 3 The solution is placed in another separatory funnel, a...

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Abstract

The methanol synthesizing catalyst has the molar ratio of Cu to Zn to Al to Li equal to 6:3:1:0.5, and is prepared through coprecipitation process. The preparation process includes the following steps: 1. dropping mixed solution of nitrate of Cu, Zn, Al and Li in certain molar ratio and Na2CO3 solution into small amount of deionized water while stirring and maintaining the solution pH in 7-8; and 2. ageing for 2 hr after finishing dropping, suction filtering, washing and stoving to obtain the catalyst precursor, and stoving and roasting to obtain the catalyst product. The preparation process is simple and easy to use in industrial production, and the catalyst has activity higher than traditional Cu-Zn-Al catalyst and wide application range for traditional synthetic gas and synthetic gas with relatively high CO and CO2 content.

Description

technical field [0001] The invention relates to a catalyst for synthesizing methanol and a preparation method thereof. technical background [0002] The process of synthesizing methanol by medium and low pressure gas phase method is an advanced process commonly used in the world at present, and the catalysts used in it are basically mixed oxides of copper, zinc and aluminum. However, due to the different preparation methods, the activity of the catalysts varies greatly. [0003] German patent DD296855 discloses a preparation technology for synthesizing methanol catalyst, which is to co-precipitate the aqueous solution of soluble salts of copper, zinc and aluminum with alkali metal carbonate, and the precipitation is divided into two stages in the range of 20-60 ° C. Precipitate at a lower pH (4.5-5.5) first, and raise the pH value of the precipitate to 6-8 in the later stage of the reaction. Canadian patent CA1011325 discloses a preparation technology for synthesizing meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/03C07C31/04C07C29/154
CPCY02P20/52
Inventor 常杰付严张喜通王铁军
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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