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Yolk-eggshell structured catalyst and preparation method and application thereof

A catalyst and eggshell technology, which is applied in the field of catalyst preparation, can solve the problems of complex preparation process, long synthesis cycle, and environmental pollution of strong acid etchant, and achieve the effects of low reaction temperature, reduced production cost, and high stability

Inactive Publication Date: 2014-07-16
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complicated. Firstly, a sandwich-type nanomaterial with a three-layer structure is prepared, and then the middle layer is selectively etched away with HF to form an egg yolk-eggshell nanomaterial.
Not only the synthesis cycle is longer, but also the use of strong acid etchant has caused environmental pollution

Method used

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  • Yolk-eggshell structured catalyst and preparation method and application thereof
  • Yolk-eggshell structured catalyst and preparation method and application thereof
  • Yolk-eggshell structured catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add 0.15 g of mesoporous carbon spheres to 0.66 mL of 0.06 mol / L NH4RuCl6 aqueous solution, ultrasonicate for 15 minutes, let stand for 12 hours, and dry at 100°C for 30 minutes. Under vigorous stirring at 0°C, 1.5 mL of 0.5 mol / L KBH4 aqueous solution was added dropwise to the above solution, and stirring was continued for 30 minutes after the dropwise addition. Centrifugation yielded a black solid, which was washed repeatedly with deionized water until neutral.

[0022] (2) The product obtained in step (1) was added to a mixed solution of 27 mL of ethanol, 50 mL of water, 0.1 g of cetyltrimethylammonium bromide, 37 μL of dodecanol and 1 mL of 30 mg / mL sodium hydroxide, and sonicated for 15 minutes. After stirring for 60 minutes, 1.6 mL of tetraethyl orthosilicate was slowly added dropwise. After stirring at 60°C for 3 hours, the product was washed by centrifugation, added to 100 mL of acetone, and stirred and refluxed at 55°C for 48 hours.

[0023] (3) adding th...

Embodiment 2

[0026] (1) Add 0.15g of mesoporous carbon spheres to 0.66mL of 0.06mol / L NH 4 RuCl 6 In aqueous solution, sonicated for 15 minutes, allowed to stand for 12 hours, and dried at 100°C for 30 minutes. Add 10 mL of 2 mol / L KBH dropwise to the above solution at 0 °C with vigorous stirring. 4 The aqueous solution was added dropwise and continued to stir for 30 minutes. Centrifugation yielded a black solid, which was washed repeatedly with deionized water until neutral.

[0027] (2) The product obtained in step (1) was added to a mixed solution of 27 mL of ethanol, 50 mL of water, 0.1 g of cetyltrimethylammonium bromide, 37 μL of dodecanol and 1 mL of 30 mg / mL sodium hydroxide, and sonicated for 15 minutes. After stirring for 60 minutes, 1.6 mL of tetraethyl orthosilicate was slowly added dropwise. After stirring at 60°C for 3 hours, the product was washed by centrifugation, added to 100 mL of acetone, and stirred and refluxed at 55°C for 48 hours.

[0028] (3) adding the produc...

Embodiment 3

[0030] (1) Add 0.15g of mesoporous carbon spheres to 0.66mL of 0.06mol / L NH 4 RuCl 6 In aqueous solution, sonicated for 15 minutes, allowed to stand for 12 hours, and dried at 100°C for 30 minutes. Add 10 mL of 2 mol / L KBH dropwise to the above solution at 0 °C with vigorous stirring. 4 The aqueous solution was added dropwise and continued to stir for 30 minutes. Centrifugation yielded a black solid, which was washed repeatedly with deionized water until neutral.

[0031] (2) The product obtained in step (1) was added to a mixed solution of 27 mL of ethanol, 50 mL of water, 0.1 g of cetyltrimethylammonium bromide, 37 μL of dodecanol and 1 mL of 30 mg / mL sodium hydroxide, and sonicated for 15 minutes. After stirring for 60 minutes, 1.6 mL of tetraethyl orthosilicate was slowly added dropwise. After stirring at 60°C for 3 hours, the product was washed by centrifugation, added to 100 mL of acetone, and stirred and refluxed at 55°C for 48 hours.

[0032] (3) adding the produc...

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Abstract

The invention discloses a yolk-eggshell structured catalyst and a preparation method and an application thereof. By a simple and environmentally friendly inclusion-etching technology, preparation of a yolk-eggshell structured catalyst with the diameter of 400-500nm is realized. Compounding of the yolk-eggshell structured catalyst and saccharifying enzyme is applicable to an amylolysis-hydrogenation one-step method for production of sorbitol. The catalyst provided by the invention has the following advantages: the preparation technology of the catalyst is simple and environmentally friendly; the core has high catalytic hydrogenation activity, and operating temperature for production of sorbitol by the amylolysis-hydrogenation one-step method can be reduced; the shell has volatile pores which are beneficial to mass transfer of reactants; and the catalyst provided by the invention has more excellent catalytic performance than a non-yolk-eggshell structured supported metal catalyst and can be reused for many times.

Description

technical field [0001] The present invention relates to the field of catalysts, in particular to a preparation method and application of a catalyst having an egg yolk-egg shell structure. Background technique [0002] Sorbitol is an important raw material produced in the chemical, pharmaceutical, food and other industries. Its preparation is mainly based on starch, and glucose is obtained by enzymatic hydrolysis of starch, and then the glucose is converted into sorbitol by metal catalyzed hydrogenation. Its production is a two-step method, that is, the enzymatic hydrolysis and hydrogenation steps must be carried out separately, which not only causes the complexity of the operation process, but also increases the production cost. The reasons why it is not possible to directly use metal catalysts combined with saccharification enzymes for starch hydrolysis-hydrogenation one-step production of sorbitol are: 1. The optimal use conditions of saccharification enzymes and metals ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J35/02C12P7/18C07C31/26C07C29/141B01J35/00
Inventor 李辉魏巍赵羽李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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