In-site composite method for Ag/SBA-15 catalyzer

A technology of in-situ synthesis and synthesis method, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high CO complete oxidation temperature, low Ag loading, etc., and achieves easy industrial application and improved The effect of silver content and simple preparation process

Inactive Publication Date: 2010-03-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the loading of Ag in the prepared Ag / SBA-15 catalyst is very small, and the complete oxidation temperature of CO is high

Method used

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  • In-site composite method for Ag/SBA-15 catalyzer
  • In-site composite method for Ag/SBA-15 catalyzer
  • In-site composite method for Ag/SBA-15 catalyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 4g of P123 into the pre-prepared 0.5mol / L nitric acid solution, stir in a water bath at 40°C, and dissolve P123 completely until a transparent solution is formed. Add 0.378g of silver nitrate to the solution, stir for 2 hours, then add 9ml of tetraethyl orthosilicate to the solution, and after stirring for 20 hours, transfer the obtained microemulsion to an autoclave, put it in an oven at 100°C for 48 hours to stand for crystallization, After cooling to room temperature, adjust the pH of the solution to 5 with ammonia water, then transfer the mixed solution to an autoclave, put it in an oven at 100°C for crystallization for 48 hours, filter it after cooling to room temperature, wash it, and place it in a vacuum drying oven at 70°C After drying for 12 hours, the Ag / SBA-15 catalyst can be obtained by calcining at 540°C for 10 hours in a muffle furnace under an air atmosphere.

Embodiment 2

[0022] According to the preparation method of the present invention in Example 1, the two steps of alkali adjustment of pH and recrystallization were omitted to prepare the Ag / SBA-15 catalyst.

Embodiment 3

[0024] According to the preparation method of the present invention in Example 1, 4gP123 was added to the pre-prepared 1mol / L nitric acid solution, stirred at 35°C in a water bath, and the hydrothermal reaction was left to crystallize at 80°C for 24h to obtain Ag / SBA- 15 catalysts.

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Abstract

The invention discloses an in-site composite method for Ag / SBA-15 catalyzer, which comprises the following steps: taking silver nitrate as silver source, introducing silver nitrate into microemulsioncomprising silicon source, template agent, nitric acid and distilled water to be reacted, being crystallized for 24h-48h in the temperature of 80-120 DEG C in a high pressure reactor, adjusting pH value with alkali, and then being put into the high pressure reactor to be crystallized for 24h-48h in the temperature of 80-120 DEG C, filtering, washing and drying, and finally burning for 10h in a muffle in the temperature of 540 DEG C, thus obtaining Ag / SBA-15 catalyzer. The preparation method provided by the invention can prepare Ag / SBA-15 catalyzer with regular pore paths and high specific surface area and increases the silver content loaded by the Ag / SBA-15 catalyzer by adjusting the solution pH value.

Description

technical field [0001] The invention relates to an in-situ synthesis method of an Ag / SBA-15 catalyst, in particular to a preparation method of a silver-containing catalyst with a regular hexagonal pore structure. Background technique [0002] Since Prof. Stucky and his collaborators synthesized the mesoporous material SBA-15 by using a triblock polymer as a template, it has hexagonal channels and regular pore size distribution. The templating agent has higher thermal and hydrothermal stability afterwards. Its appearance can carry out many processes such as catalysis, adsorption and separation of macromolecules that are difficult to complete in zeolite molecular sieves. Although SBA-15 has hexagonal channels, its framework is mainly composed of amorphous silica, which is difficult to be used in catalytic reactions. This requires the introduction of catalytic active centers in the pore walls or channels of SBA-15 through various ways. At present, the synthesis of Ag / SBA-15 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J35/10
Inventor 曲振平张晓东李新勇
Owner DALIAN UNIV OF TECH
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