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Catalyst for preparing 1,3-dihydroxyacetone from glycerol and preparation method thereof

A dihydroxyacetone catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of Au sintering and particle size, active components The utilization rate is not high, the specific surface area is low, etc., to achieve the effect of good activity and selectivity, enriching active sites, and increasing the surface area

Active Publication Date: 2021-11-30
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​ZnO is generally low, which is not conducive to the dispersion of Au when used as a carrier.
Especially at high loads, the surface tension causes Au to sinter and the particles become larger, which is easy to lose and the utilization rate of precious metals is low
[0004] However, the above-mentioned catalysts generally have the defects of low utilization rate of active components, insufficient activity, and insufficient stability, dispersion and specific surface area of ​​the carrier components, resulting in insufficient selectivity of 1,3-dihydroxyacetone. To develop a Catalysts with excellent activity are necessary

Method used

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  • Catalyst for preparing 1,3-dihydroxyacetone from glycerol and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method for preparing 1,3-dihydroxyacetone catalyst, comprising the steps of:

[0022] (1) Preparation of ZnAl-HTLc: soluble 0.375gAl(NO 3 ) 3 9H 2 O, 0.891gZn(NO 3 ) 2 ·6H 2 O was dissolved in 150ml of deionized water to prepare mixed solution A, and 0.042gNa 2 CO 3 Dissolve 0.48g NaOH in 150ml deionized water to prepare mixed solution B, then quickly mix solution A and solution B under rapid stirring, and reflux reaction at 60°C for 10h. After the reaction, the product is centrifugally washed to neutral, Dry to get ZnAl-HTLc;

[0023] (2) Preparation of composite carrier: Add 80mL of ZnAl-HTLc12g prepared in step (1) into 0.6mol / L glucose monohydrate aqueous solution, stir at room temperature until uniformly mixed; then transfer the above mixture to poly In a tetrafluoroethylene reactor, react at a constant temperature of 180°C for 6 hours, cool to room temperature after the reaction, separate the product, then alternately wash with deionized wate...

Embodiment 2

[0026] A preparation method for preparing 1,3-dihydroxyacetone catalyst, comprising the steps of:

[0027] (1) Preparation of ZnAl-HTLc: soluble 0.375gAl(NO 3 ) 3 9H 2 O, 0.594gZn(NO 3 ) 2 ·6H 2 O was dissolved in 150ml of deionized water to prepare mixed solution A, and 0.042gNa 2 CO 3Dissolve 0.32g NaOH in 150ml deionized water to prepare mixed solution B, then quickly mix solution A and solution B under rapid stirring, and reflux reaction at 60°C for 10h. After the reaction, the product is centrifugally washed to neutral, Dry to get ZnAl-HTLc;

[0028] (2) Preparation of composite carrier: Add 15g of ZnAl-HTLc prepared in step (1) into 80mL of glucose monohydrate aqueous solution with a concentration of 0.6mol / L, stir at room temperature until uniformly mixed; then transfer the above mixture to poly In a tetrafluoroethylene reactor, react at a constant temperature of 180°C for 6 hours, cool to room temperature after the reaction, separate the product, then alternate...

Embodiment 3

[0031] A preparation method for preparing 1,3-dihydroxyacetone catalyst, comprising the steps of:

[0032] (1) Preparation of ZnAl-HTLc: soluble 0.375gAl(NO 3 ) 3 9H 2 O, 0.891gZn(NO 3 ) 2 ·6H 2 O was dissolved in 150ml of deionized water to prepare mixed solution A, and 0.05gNa 2 CO 3 Dissolve 0.40g NaOH in 150ml deionized water to prepare mixed solution B, then quickly mix solution A and solution B under rapid stirring, and reflux reaction at 60°C for 10h. After the reaction, the product is centrifugally washed to neutral, Dry to get ZnAl-HTLc;

[0033] (2) Preparation of the composite carrier: add the ZnAl-HTLc12g prepared in step (1) into 100mL, and the concentration is 0.5mol / L in the aqueous glucose monohydrate solution, and stir at room temperature until uniformly mixed; then transfer the above mixture to poly In a tetrafluoroethylene reactor, react at a constant temperature of 180°C for 6 hours, cool to room temperature after the reaction, separate the product,...

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Abstract

The invention discloses a preparation method for preparing 1,3-dihydroxyacetone catalyst from glycerol. The method comprises the following steps: (1) preparation of ZnAl-HTLc: dissolving zinc salt and aluminum salt in deionized water to prepare a solution A, the Na 2 CO 3 Prepare solution B with NaOH, rapidly mix solution A and solution B, and perform reflux reaction, centrifugal washing and drying after the reaction is finished to obtain ZnAl-HTLc; (2) preparation of composite carrier: the prepared ZnAl-HTLc is added to monohydrate In the aqueous glucose solution, mix well; then the above mixture is transferred to the polytetrafluoroethylene reactor, hydrothermally reacted, then cooled, washed and dried to obtain a ZnAl-HTLc / carbon composite carrier; (3) the preparation of the catalyst: respectively Copper nitrate, lanthanum nitrate and cobalt nitrate are configured into a solution, the above solution is added into the composite carrier at the same time, and after impregnation, it is dried, calcined, and activated by hydrogen to obtain the catalyst. The catalyst of the invention has good activity, selectivity and stability, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for preparing 1,3-dihydroxyacetone from glycerol and a preparation method thereof. Background technique [0002] 1,3-Dihydroxyacetone (DHA for short) is the simplest ketose sugar, which is easily soluble in organic solvents such as water, ethanol, acetone and ether. DHA is an important chemical raw material, widely used in fine chemical industry, food, cosmetics and water purification and other industries; at the same time, DHA is also an important organic synthesis intermediate, which can be used to prepare various chiral compounds by aldol condensation and reduction preparation Optically active secondary alcohols, Diels-Alder addition to prepare sugar compounds or further reactions for such addition reactions, insertion reactions with carbene, and preparations with 2,2-dialkoxycyclopropane derivatives Lactone, etc. [0003] At present, 1,3-dihydroxyacetone is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C07C45/39C07C49/17
CPCB01J23/83C07C45/39C07C49/17
Inventor 王宝荣廖维林郭韬芮培欣谢贤清
Owner JIANGXI NORMAL UNIV