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Catalyst with core-shell structure, and preparation method and application thereof

A core-shell structure and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problem of metal catalytic activity decline, achieve excellent catalytic performance and reduce costs

Inactive Publication Date: 2013-02-06
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These gelatinous starch pastes will cover the surface of the metal catalyst, resulting in a decrease in the catalytic activity of the metal

Method used

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  • Catalyst with core-shell structure, and preparation method and application thereof
  • Catalyst with core-shell structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 1.6g of cetyltrimethylammonium bromide and 5.6mL of 2.0mol / L NaOH solution into 760mL of water (pH 11.5), and stir at 90°C for 1.5h. Add 8.0mL tetraethyl orthosilicate dropwise, keep stirring for 2h, let stand for 20h, filter with suction, and roast in air at 550°C for 6h to obtain a white solid; add 1.0g of the above solid to 4.4mL 0.06mol / L NH 4 RuCl 6 solution (0.264mmol), 60W ultrasonic 10min, microwave drying at 120℃ for 30min. After cooling, add 5.0 mL of 2mol / L KBH at 0°C 4 Aqueous solution (10mmol), continue to stir until no bubbles are generated, centrifuge and wash the product until neutral.

[0026] (2) Add the product obtained in step 1 into a mixed solution of 180mL ethanol and 60mL 28% ammonia water, add dropwise 0.075mL N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 6.0mL ethanol and a mixed solution of 6.0 mL tetraethyl orthosilicate. After stirring for 30 min, a mixed solution of 0.6 g of cetyltrimethylammonium bromide, 90 mL of ethanol and...

Embodiment 2

[0030] The catalyst described in Example 1 is applied to the reaction of starch hydrolysis-hydrogenation one-step production of sorbitol. That is: add 100mL of 10% starch aqueous solution, 0.025g metal Ru catalyst and 0.04mL glucoamylase into a 200mL reaction kettle. Fill and discharge with hydrogen 4-5 times to replace the air in the reactor, and finally control the hydrogen pressure in the reactor at 6.0MPa. The temperature was raised to 75°C for 6 hours. The reaction product was detected by liquid chromatography equipped with a Shodex sugar SC1011 chromatographic column and a differential refractive index detector. All activity data were repeated more than three times, and the error range was within 5%. The conversion rate of starch is 99%, and the yield of sorbitol is 99%.

Embodiment 3

[0032] (1) Add 1.6g of cetyltrimethylammonium bromide and 5.6mL of 2.0mol / L NaOH solution into 760mL of water, and stir at 90°C for 1.5h. After adding 8.0 mL of tetraethyl orthosilicate dropwise, keep stirring for 2 hours, let stand for 20 hours, filter with suction, and roast in air at 550°C for 6 hours to obtain a white solid. Add 1.5 g of the above solid to 4.4 mL of 0.06 mol / L NH 4 RuCl 6 In the solution, 60W ultrasonic for 10min, 120℃ microwave drying for 30min. After cooling, add 5.0 mL of 2mol / L KBH at 0°C 4 Aqueous solution, continue to stir until no bubbles are produced, centrifuge and wash the product until neutral.

[0033] (2) Add the product of step 1 into the mixed solution of 270mL ethanol and 90mL 28% ammonia water, add dropwise 0.113mL N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 9.0mL ethanol and 9.0mL tetraethyl orthosilicate mixed solution. After stirring for 30 min, a mixed solution of 0.9 g of cetyltrimethylammonium bromide, 135 mL of ethanol and ...

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Abstract

The invention discloses a catalyst with a core-shell structure, a preparation method of the catalyst, and an application of the catalyst. The catalyst is of a core-shell structure, wherein the diameter of the catalyst is 200 nm to 400 nm, the shell layer is silicon dioxide with thickness of 10 nm to 80 nm, the core is silicon dioxide with diameter of 10 nm to 200 nm, and 0.5 nm to 5.0 nm of metal nano particles are loaded in the core, the loading capacity is 0.1-5.0wt%. With the adoption of the preparation method of the catalyst, the preparation of the catalyst which has the core-shell structure and is 200nm to 400 in diameter is prepared by a packing-etching technology. The catalyst with the core-shell structure can be used as the catalyst for producing sorbitol by using an amylolysis-hydrogenation one-step method; and the catalysis property is better than that of a load-type metal catalyst with non-core-shell structure, and meanwhile, the catalyst can be reused for several times, so that the cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a catalyst with a core-shell structure, a preparation method thereof, and an application of starch hydrolysis-hydrogenation one-step method to produce sorbitol. Background technique [0002] With the development of industrialization and the improvement of human living standards, energy consumption has increased rapidly. However, fossil fuel energy such as oil, coal, and natural gas, which play a leading role in industrial development, is gradually decreasing; moreover, its use has also caused serious pollution and crises to the living environment of human beings. The development of biomass energy not only has the practical significance of replacing fossil energy, but also an effective measure for energy conservation and emission reduction. Therefore, the development and utilization of clean and renewable biomass energy has become an inevitable trend in the development of the 21st centur...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/02C07C31/26C07C29/132
Inventor 李辉徐亮
Owner SHANGHAI NORMAL UNIVERSITY
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