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Catalyst for synthesizing pyruvic aldehyde and its preparing method

A technology of catalyst and methylglyoxal, which is applied in the preparation of organic compounds, molecular sieve catalysts, carbon-based compounds, etc., to achieve the effects of mild reaction conditions, high stability, and easy recycling

Inactive Publication Date: 2008-07-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned supported silver catalysts have certain advantages in the oxidation of propylene glycol, the reaction temperature is generally around 500 °C, and it is still a challenge to obtain high conversion and selectivity at such a high temperature.

Method used

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  • Catalyst for synthesizing pyruvic aldehyde and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Preparation of Catalyst A1. Take 3.4g silver nitrate AgNO 3 Dissolve in 200mL deionized water. Add 10g of 4A molecular sieves to the above solution, stir and react at 80°C for 4h, filter, wash the solid product with 800mL of deionized water, dry at 80°C for 4h, and then soak it in 7mL of 0.015g phosphoric acid solution at room temperature for 10h, 80°C Dry for 4h. Dry at 80°C for 4 hours, and calcined at 400°C for 4 hours to obtain catalyst A1, whose composition is shown in Table 1.

Embodiment 2

[0020] Preparation of Catalyst A2. Take 3.4g silver nitrate AgNO 3 Dissolve in 200mL deionized water. Add 10g of 4A molecular sieves to the above solution, stir and react at 80°C for 4h, filter, wash the solid product with 800mL of deionized water, dry at 80°C for 4h, then impregnate with 7mL of 0.03g phosphoric acid solution at room temperature for 10h, 80°C Dry for 4h. Dry at 80°C for 4 hours, and calcined at 400°C for 4 hours to obtain catalyst A2, whose composition is shown in Table 1.

Embodiment 3

[0022] Preparation of Catalyst A3. Take 3.4g silver nitrate AgNO 3 Dissolve in 200mL deionized water. Add 10g of 4A molecular sieves to the above solution, stir and react at 80°C for 4h, filter, wash the solid product with 800mL of deionized water, dry at 80°C for 4h, then soak it in 7mL of 0.05g phosphoric acid solution at room temperature for 10h, 80°C Dry for 4h. Dry at 80°C for 4 hours, and calcined at 400°C for 4 hours to obtain catalyst A3, whose composition is shown in Table 1.

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Abstract

The present invention discloses catalyst for synthesizing pyruvic aldehyde and its preparation process. The catalyst contains Ag as the main active component and accounting for 1-20 wt%; P, Bioavailability, Zr, K and Zn as auxiliary active components and accounting for 0.01-10 wt%; and catalyst carrier not less than 70 wt%. The catalyst of the present invention has the advantages of: homogeneous dispersion and easy granulation regulation of Ag, high stability, mild pyruvic aldehyde preparing reaction condition, high activity, high selectivity, small use quality and easy circulating use.

Description

technical field [0001] The invention relates to a catalyst for synthesizing methylglyoxal and a preparation method. Background technique [0002] Silver catalyst has excellent catalytic oxidation activity, which is one of the major discoveries in the field of catalysis in recent years. Silver catalysts have been found to be effective in CO and NO x Elimination, hydrocarbon oxidation, water vapor shift and other fields have good application prospects. The common preparation methods of silver catalysts include co-precipitation method, deposition precipitation method, impregnation method and so on. In the catalyst obtained by the coprecipitation method, part of the silver is wrapped by the carrier, which cannot play a catalytic role, and the utilization rate of silver is low. The deposition precipitation method is only suitable for supports with an isoelectric point of pH ≥ 6, and the catalysts prepared by these two methods still have the disadvantage that the particle size ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/068B01J27/185B01J21/06B01J23/06B01J23/02C07C45/39
Inventor 朱明乔韩守刚何潮洪
Owner ZHEJIANG UNIV
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