Core shell catalyst by taking hydrotalcite as shell and molecular sieve as core as well as preparation and application thereof

A technology of core-shell catalyst and core-shell molecular sieve, which is applied in the direction of molecular sieve catalyst, physical/chemical process catalyst, amino compound preparation, etc. It can solve the problems of poor stability and easy sintering, low metal loading, uncontrollable size, etc., and achieve high utilization rate High, simple preparation process, easy to industrialized production effect

Active Publication Date: 2017-03-08
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there has been no report on molecular sieve / hydrotalcite composite dual-functional materials. The impregnation method, ion exchange method, gel method or precipitation method in the prior art has uncontrollable size, low dispersion, poor stability, easy sintering, and metal loading. Disadvantages such as low quantity

Method used

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  • Core shell catalyst by taking hydrotalcite as shell and molecular sieve as core as well as preparation and application thereof
  • Core shell catalyst by taking hydrotalcite as shell and molecular sieve as core as well as preparation and application thereof
  • Core shell catalyst by taking hydrotalcite as shell and molecular sieve as core as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Dissolve 1 g of silica-alumina molecular sieve with FAU topological structure in 50 mL of deionized water, stir at room temperature for half an hour, and ultrasonicate for half an hour to make it uniformly dispersed into a solution for later use.

[0030] b. Dissolve 1.5 g of nickel nitrate and 1.5 g of ammonium chloride in 50 mL of deionized water, stir evenly at room temperature to form b solution for later use.

[0031] c. Slowly add the above-mentioned solution b into the solution a, stir evenly at room temperature, then slowly add ammonia water dropwise, and prepare C solution with pH=8 for later use.

[0032] d. The above C solution was stirred at 70°C for 12 hours, the filtrate was alternately washed with water and ethanol until neutral, and vacuum-dried at room temperature to obtain a core-shell structure with molecular sieve as the core and petal-shaped hydrotalcite as the shell. Appearance of FAU / NiAl LDHs molecular sieves.

[0033] See attached figure 1 ...

Embodiment 2

[0037] a. Dissolve 0.8 g of silica-alumina molecular sieve with FAU topological structure in 50 ml of deionized water, stir at room temperature for half an hour, and ultrasonically disperse evenly for half an hour to form a solution for later use.

[0038] b. Dissolve 1.5 g of nickel nitrate and 2.4 g of ammonium nitrate in 50 ml of deionized water, stir evenly at room temperature to form b solution for later use.

[0039] c. Slowly add the above-mentioned solution b into solution a, stir evenly at room temperature, then slowly add ammonia water dropwise, and prepare C solution with pH=9 for use.

[0040] d. The above C solution was stirred at 50°C for 20 hours, the filtrate was alternately washed with water and ethanol until neutral, and vacuum-dried at room temperature to obtain a core-shell structure with molecular sieve as the core and petal-shaped hydrotalcite as the shell. Appearance of FAU / NiAl LDHs molecular sieves.

Embodiment 3

[0042] a. Dissolve 1.5g of silica-alumina molecular sieve with FAU topological structure in 50 ml of deionized water, stir at room temperature for half an hour, and ultrasonicate for half an hour to make it uniformly dispersed into a solution for later use.

[0043] b. Dissolve 1.9g of magnesium nitrate and 2.4g of ammonium nitrate in 50ml of deionized water, stir evenly at room temperature to form b solution for later use.

[0044] c. Slowly add the above-mentioned solution b into solution a, stir evenly at room temperature, then slowly add ammonia water dropwise, and prepare C solution with pH=7.5 for use.

[0045] d. The above C solution was stirred at 75°C for 45 hours, the filtrate was alternately washed with water and ethanol until neutral, and vacuum-dried at room temperature to obtain a core-shell structure with molecular sieve as the core and petal-shaped hydrotalcite as the shell. Appearance of FAU / MgAl LDHs molecular sieves.

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Abstract

The invention discloses a core shell catalyst by taking hydrotalcite as a shell and a molecular sieve as a core as well as a preparation and an application thereof. According to the invention, divalent metal source and aluminum species in a core-shell molecular sieve are used for forming a hydrotalcite compound on the surface of the molecular sieve, and the core-shell structure molecular sieve by taking the molecular sieve as the core and the petal hydrotalcite as the shell is formed; after the molecular sieve is reduced, the nano-grade metal-modified molecular sieve catalyst having uniform size, high dispersibility, excellent heat stability and high universality is obtained, and can be used for a catalytic reaction for hydrogenation synthesis of m-dinitrobenzene to obtain m-phenylenediamine. compared with the prior art, the preparation process is simple, the metal atom utilization rate is high, applied metal source is almost completely reacted, no loss is generated, cost is reduced, and pollution on environment is reduced, industrial production is easy, and a series of different metal-modified molecular sieve catalysts can be prepared according to the modifiable character of the composition elements of the hydrotalcite and diversity of a topological structure of the molecular sieve.

Description

technical field [0001] The invention relates to the technical field of core-shell molecular sieves, in particular to a molecular sieve in which hydrotalcite is formed as a shell / molecular sieve as a core in situ on the surface of a molecular sieve, and its preparation and application. Background technique [0002] Zeolite molecular sieve is a kind of crystalline aluminosilicate, which has special pore structure, suitable acidity, large specific surface area and excellent hydrothermal stability, so it has important applications in adsorption, separation and catalysis. Especially in the field of heterogeneous catalysis, molecular sieves have shown excellent catalytic performance in industrial applications such as hydrocracking, alkylation, toluene disproportionation, and isomerization of aromatics. They are widely used as catalysts and catalyst supports in the petrochemical industry . Metal-modified molecular sieves combine the activity of metals with the shape-selective cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/24B01J35/02C07C209/36C07C211/51
CPCB01J29/24B01J29/76B01J29/7623B01J29/763B01J35/026C07C209/36C07C211/51
Inventor 吴鹏王博徐浩王达锐吴海虹何鸣元
Owner EAST CHINA NORMAL UNIV
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