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Catalyst for 1,3-dihydroxyacetone prepared from glycerin and preparation method thereof

A dihydroxyacetone and catalyst technology, applied in the field of catalysis, can solve the problems of Au sintering and particle size, easy loss of precious metal utilization rate, unfavorable Au dispersion, etc., and achieves good glycerol conversion rate, good stability, and mild reaction process conditions. Effect

Inactive Publication Date: 2018-07-13
BEIJING UNIV OF CHEM TECH
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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

Method used

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  • Catalyst for 1,3-dihydroxyacetone prepared from glycerin and preparation method thereof
  • Catalyst for 1,3-dihydroxyacetone prepared from glycerin and preparation method thereof
  • Catalyst for 1,3-dihydroxyacetone prepared from glycerin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Add 0.1894gGa(NO 3 ) 3 ·5H 2 O, 4.4624gZn (NO 3 ) 2 ·6H 2 O and 2.0001gCr(NO 3 ) 3 9H 2 O was dissolved in 150 mL deionized water to prepare solution A. Weigh 1.0600gNa 2 CO 3 Dissolve 1.2000g NaOH in 150mL deionized water to prepare solution B.

[0028] Pour solutions A and B into a rotating liquid film reactor at the same time and mix quickly, the speed is 4000rpm, the gap between the stator and the rotor is 15μm, nucleation takes 180 seconds; the suspension after nucleation is kept in a water bath at 80°C for 20h, Naturally cooled to room temperature; the obtained precipitate was washed with deionized water and centrifuged until neutral, and dried at 60 °C for 12 h to obtain Ga 0.15 -Zn 3 Cr 1 -LDH. The calcined product Ga 2 o 3 / Zn 3 Cr 1 o 4.5 .

[0029] B. Weigh 1.0000g of Ga from step A 2 o 3 / Zn 3 Cr 1 o 4.5 Place in 80mL of deionized water, stir, add 4.06mL of 50mmol / L HAuCl 4 Solution, and then use 3mol / L urea to adjust the pH of t...

Embodiment 2

[0031] A. Add 0.1894gGa(NO 3 ) 3 ·5H 2 O, 5.9499gZn (NO 3 ) 2 ·6H 2 O and 2.0001gCr(NO 3 ) 3 9H 2 O was dissolved in 150mL deionized water to prepare solution A, and weighed 2.1200gNa 2 CO 3 Dissolve 1.2000g NaOH in 150mL deionized water to prepare solution B. Pour solutions A and B into a rotating liquid film reactor at the same time and mix quickly, the speed is 4000rpm, the gap between the stator and the rotor is 15μm, nucleation takes 180 seconds; the suspension after nucleation is kept in a water bath at 80°C for 20h, Naturally cooled to room temperature; the obtained precipitate was washed with deionized water and centrifuged until neutral, and dried at 60 °C for 12 h to obtain Ga 0.15 -Zn 4 Cr 1 -LDHs. The calcined product Ga 2 o 3 / Zn 4 Cr 1 o 4.0 .

[0032] B. Weigh 1.0000g of Ga from step A 2 o 3 / Zn 4 Cr 1 o 4.0 Place in 80mL of deionized water, stir, add 3.50mL of 50mmol / L HAuCl 4 solution, and then use 1mol / L NaOH solution to adjust the pH...

Embodiment 3

[0034] A. Add 0.0426gRuCl 3 , 5.9499gZn (NO 3 ) 2 ·6H 2 O and 2.0001gCr(NO 3 ) 3 9H 2 O was dissolved in 150mL deionized water to prepare solution A, and weighed 2.1200gNa 2 CO 3 Dissolve 1.2000g NaOH in 150mL deionized water to prepare solution B. Pour solutions A and B into a rotating liquid film reactor at the same time and mix quickly, the speed is 4000rpm, the gap between the stator and the rotor is 15μm, nucleation takes 180 seconds; the suspension after nucleation is kept in a water bath at 80°C for 20h, Naturally cooled to room temperature; the obtained precipitate was washed with deionized water and centrifuged until neutral, and dried at 60°C for 12h to obtain Ru 0.03 -Zn 4 Cr 1 -LDHs. Calcined at 700 °C for 6 h at a heating rate of 5 °C / min to obtain the roasted product RuO 2 / Zn 4 Cr 1 o 3.9 .

[0035] B. Weigh 1.0000g of RuO from step A 2 / Zn 4 Cr 1 o 3.9 Place in 80mL of deionized water, stir, add 3.20mL of 50mmol / L HAuCl 4 solution, and then...

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PUM

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Abstract

The invention provides a catalyst for 1,3-dihydroxyacetone prepared from glycerin and a preparation method thereof. The catalyst is prepared by the steps: introducing an auxiliary component M into a hydrotalcite slab to form M-Zn-Y ternary hydrotalcite M-ZnY-LDHs, and calcining to obtain MOx / ZnYOz; taking the composite oxide as a carrier, supporting an Au salt onto the carrier, drying and reducing, thereby obtaining the Au-MOx / ZnYOz. The active ingredient Au of the catalyst is small in granule size, highly dispersed and stable under the actions of highly dispersed transition metal oxide MOx, has high catalytic oxidation activity of the glycerin and maintains excellent recyclability. The catalyst is applied to a reaction for preparing dihydroxy acetone by virtue of selective glycerin oxidation, and has high dihydroxy acetone yield under non-alkali conditions.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a catalyst for preparing 1,3-dihydroxyacetone from glycerin and a preparation method thereof. The catalyst has the characteristics of small active component Au particle size, high degree of dispersion and good stability. Background technique [0002] The severe shortage of fossil resources and their use have caused ecological damage and environmental pollution are becoming more and more serious. Replacing fossil resources with cheap renewable biomass energy is an important way for green and sustainable development. In recent years, with the rapid development of biodiesel, a large amount of by-products of crude glycerol are surplus, and the market price of glycerin keeps falling. Glycerol is a versatile biomass platform "building block molecule" that can be converted into a variety of commercially valuable products such as 1,2-propanediol, 1,3-propanediol, glyceric ...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J23/652B01J23/89B01J37/03B01J37/08C07C49/17C07C45/39
CPCC07C45/39B01J21/005B01J23/002B01J23/6522B01J23/685B01J23/8993B01J37/031B01J37/035B01J37/082B01J37/088B01J2523/00B01J35/394B01J35/393B01J35/23B01J2523/27B01J2523/32B01J2523/67B01J2523/821B01J2523/17B01J2523/31C07C49/17Y02P20/584
Inventor 李殿卿潘勇宁贺宇飞冯俊婷
Owner BEIJING UNIV OF CHEM TECH
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