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Ternary composite metal oxide solid alkali catalyst and preparation method and application thereof

A solid base catalyst, ternary composite technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low catalyst activity, easy agglomeration and deactivation, Problems such as low yield of glycerol carbonate, to achieve the effect of high specific surface area, rich in basic sites, inhibition of growth and aggregation

Inactive Publication Date: 2019-04-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the literature Applied Catalysis A: General, 2016, 513, 9-18, Liu et al. 2 As catalyst, 2-cyanopyridine was used as dehydrating agent, glycerol and CO 2 Glycerol carbonate is prepared as the reaction raw material, but the yield of glycerol carbonate is relatively low, only 78%
CeO 2 Nanocatalysts catalyze glycerol and CO 2 The reaction of preparing glycerol carbonate often faces problems such as low catalyst activity and easy agglomeration and deactivation

Method used

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  • Ternary composite metal oxide solid alkali catalyst and preparation method and application thereof
  • Ternary composite metal oxide solid alkali catalyst and preparation method and application thereof
  • Ternary composite metal oxide solid alkali catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A. Accurately weigh 5.1282g Mg(NO 3 ) 2 ·6H 2 O, 3.7519g Al(NO 3 ) 3 9H 2 O was mixed with deionized water to prepare 40 mL of mixed metal salt solution. Accurately weigh 1.8018g of urea, prepare 40mL of urea solution, and mix it evenly with metal salt solution, then put it in a reaction kettle for hydrothermal crystallization at 120°C for 24h, centrifuge, wash until neutral, and place at 70°C drying to obtain the MgAl-LDH precursor material.

[0040] Accurately weigh 0.5046g Ce(NO 3 ) 3 ·6H 2 Prepare 40 mL of cerium salt solution with O water; accurately weigh 1 g of the MgAl-LDH precursor in step A and disperse in the cerium salt solution, and ultrasonically treat for 10 min to form a stable cerium salt suspension; The sodium borohydride solution, and the cerium salt suspension were added to the colloid mill and stirred for 5 minutes, then placed in a hydrothermal kettle equipped with a polytetrafluoroethylene liner, heated to 150°C in an oven for hydrotherma...

Embodiment 2

[0044] Accurately weigh 10.2564g Mg(NO 3 ) 2 ·6H 2 O, 3.7519g Al(NO 3 ) 3 9H 2 O was mixed with deionized water to prepare 40 mL of mixed metal salt solution. Accurately weigh 3.0030g of urea, prepare 40mL of urea solution, and mix it with metal salt solution evenly, then put it in a reaction kettle for hydrothermal crystallization at 120°C for 24h, centrifuge, wash until neutral, and store at 70°C drying to obtain the MgAl-LDH precursor material.

[0045] Accurately weigh 0.5046g Ce(NO 3 ) 3 ·6H 2 Prepare 40 mL of cerium salt solution with O water; accurately weigh 1 g of the MgAl-LDH precursor in step A and disperse in the cerium salt solution, and ultrasonically treat for 10 min to form a stable cerium salt suspension; The sodium borohydride solution, and the cerium salt suspension were added to the colloid mill and stirred for 5 minutes, then placed in a hydrothermal kettle equipped with a polytetrafluoroethylene liner, heated to 150°C in an oven for hydrothermal ...

Embodiment 3

[0049]Accurately weigh 4.066g MgCl 2 ·6H 2 O, 2.4143g AlCl 3 ·6H 2 O was mixed with deionized water to prepare 40 mL of mixed metal salt solution. Accurately weigh 1.8018g of urea, prepare 40mL of urea solution, and mix it evenly with metal salt solution, then put it in a reaction kettle for hydrothermal crystallization at 120°C for 24h, centrifuge, wash until neutral, and place at 70°C drying to obtain the MgAl-LDH precursor material.

[0050] Accurately weigh 0.4255g CeCl 3 ·7H 2 Prepare 40 mL of cerium salt solution with O water; accurately weigh 1 g of the MgAl-LDH precursor in step A and disperse in the cerium salt solution, and ultrasonically treat for 10 min to form a stable cerium salt suspension; The sodium borohydride solution and the cerium salt suspension were added to the colloid mill and stirred for 5 minutes, then placed in a hydrothermal kettle equipped with a polytetrafluoroethylene liner, heated to 120°C in an oven for hydrothermal crystallization for 1...

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Abstract

The invention provides a ternary composite metal oxide solid alkali catalyst and a preparation method and application thereof. According to the method, urea is taken as a precipitant, a hydrothermal method is adopted for preparing a magnalium hydrotalcite precursor, the magnalium hydrotalcite precursor is dispersed in a cerate solution, the mixture and a sodium borohydride solution are put in a colloid mill, stirred for a reaction and transferred into a hydrothermal reactor, and hydrothermal crystallization is conducted, so that CeO2 nanoparticles with rich defect sites and alkaline sites areuniformly deposited on the surface of an MgAl-LDH piece structure; a CeO2 / MgAl-LDH composite precursor is obtained, and after roasting treatment, the ternary composite metal oxide solid alkali catalyst CeO2 / MgO-Al2O3 is obtained. The CeO2 nanoparticles in the catalyst are uniformly dispersed on the surface of an MgO-Al2O3 composite oxide in a piece shape, the size of the particles is 20-30 nm, andthe mass percentage of CeO2 is 3-25%; the specific surface area of the catalyst is 80-130 m2 / g. The catalyst is used for the reaction for preparing glycerinum carbonic ester through the direct reaction of glycerinum and CO2, the conversion rate of the catalyst is 84.4-92.1%, and the selectivity of the catalyst is 92.3-93.6%.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a method for preparing a ternary composite metal oxide solid base catalyst, which is suitable for CO 2 and the selective catalytic conversion of glycerol to glycerol carbonate. Background technique [0002] With the development of modern industry, the consumption of fossil fuels produces a large amount of CO 2 , has seriously exceeded the capacity and scope of the natural carbon cycle. High concentration of CO 2 The resulting greenhouse effect is increasingly affecting human production and life. How to reduce CO 2 emissions and CO 2 Converting to high value-added fine chemicals and fuels is currently a difficult problem faced by all countries, and it is also a research difficulty and hot spot for scientific researchers. [0003] In order to reduce environmental pollution, reduce carbon emissions, and achieve green and sustainable development, countries all over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10C07D317/36
CPCC07D317/36B01J23/10B01J35/61
Inventor 范国利杨玲玲郑晓东李峰
Owner BEIJING UNIV OF CHEM TECH
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