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Method for preparing Ga*O*-Al*O* catalyst for reduction of nitrogen oxide

A ga2o3-al2o3, nitrogen oxide technology, applied in the field of nitrogen oxide reduction catalyst preparation

Inactive Publication Date: 2004-01-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, this method has not been used to prepare Ga at home and abroad. 2 o 3 -Al 2 o 3 Catalyst, and research papers and patent literature reports on the selective reduction of NOx by high hydrocarbons on this catalyst

Method used

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  • Method for preparing Ga*O*-Al*O* catalyst for reduction of nitrogen oxide
  • Method for preparing Ga*O*-Al*O* catalyst for reduction of nitrogen oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Preparation of gallium nitrate: Take 0.01 moles of gallium oxide and add it to 0.09 moles of concentrated nitric acid, stir and place it on the heating mantle for a few minutes, then add deionized water to start heating and evaporating, concentrate, add water, and concentrate again. Process 15 hours, until the solution has no obvious irritating smell,

[0020] b. After the solution is cooled, add 0.20 moles of ethylene glycol to the solution;

[0021] c. Preparation of boehmite: Add 20.423g of aluminum isopropoxide to 160ml of deionized water at a temperature of 92°C, stir and hydrolyze for 1 hour, then add 18ml of dilute nitric acid (the molar ratio of nitric acid to aluminum isopropoxide 0.3:1) aqueous solution, then vigorously stirred at 92°C for 1 hour to form a transparent sol,

[0022] d. Then, add the mixed solution of gallium nitrate and ethylene glycol obtained in b into the boehmite sol dropwise, then stir at room temperature for 24 hours,

[0023] e. Aft...

Embodiment 2

[0027] a. Preparation of gallium nitrate: Take 0.01 moles of gallium oxide and add it to 0.12 moles of concentrated nitric acid, stir and place it on the heating mantle for a few minutes, then add deionized water to start heating and evaporating, concentrate, add water, and concentrate again. Process 12 hours, until the solution has no obvious irritating smell,

[0028] b. After the solution is cooled, add 0.26 moles of ethylene glycol in the solution;

[0029] c. Preparation of boehmite: Add 20.423g of aluminum isopropoxide to 170ml of deionized water at a temperature of 90°C, stir and hydrolyze for 1 hour, then add 18ml of dilute nitric acid (the molar ratio of nitric acid to aluminum isopropoxide 0.25:1) aqueous solution, then vigorously stirred at 90°C for 1 hour to form a transparent sol,

[0030] d. Then, add the mixed solution of gallium nitrate and ethylene glycol prepared in a dropwise into the boehmite sol, and then stir at room temperature for 12 hours,

[0031] e...

Embodiment 3

[0034] a. Preparation of gallium nitrate: Take 0.01 moles of gallium oxide and add it to 0.15 moles of concentrated nitric acid, stir and place it on the heating mantle for a few minutes, then add deionized water to start heating and evaporating, concentrate, add water, and concentrate again. Process 10 hours, until the solution has no obvious irritating smell,

[0035] b. After the solution is cooled, add 0.28 moles of ethylene glycol in the solution;

[0036] c. Preparation of boehmite: Add 20.423g of aluminum isopropoxide to 175ml of deionized water at a temperature of 88°C, stir and hydrolyze for 1 hour, then add 18ml of dilute nitric acid dropwise (the molar ratio of nitric acid to aluminum isopropoxide 0.20:1) aqueous solution, then vigorously stirred at 90°C for 1 hour to form a transparent sol,

[0037] d. Then, the mixed solution of gallium nitrate and ethylene glycol prepared in (1) was added dropwise into the boehmite sol, and then stirred at room temperature for 1...

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Abstract

A process for preparing the Ga2O3-Al2O3 catalyst used in reduction of Nox includes such steps as preparing gallium nitrate from gallium oxide, preparing monohydrated bohmite by sol-gel method, mixing gallium nitrate with ethanediol, adding the mixture to monohydrated bohmite, vacuum distilling, drying and calcining. Its advantages are low cost, high specific surface area and activity, and high reducing rate as high as to 70-85%.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen oxide reduction catalyst, in particular to a preparation method of a nitrogen oxide reduction catalyst produced under lean combustion conditions with high-efficiency catalytic reduction, and belongs to the technical field of preparation of nitrogen oxide reduction catalysts. Background technique [0002] With the development of the economy and the acceleration of urbanization, automobiles have become the primary source of air pollution in cities at home and abroad. The energy crisis and the aggravation of the greenhouse effect make how to improve fuel economy and reduce carbon dioxide (CO 2 ) and other greenhouse gas emissions have become the focus of global attention. The use of lean-burn gasoline vehicles and diesel vehicles is an important way to improve fuel economy and reduce CO 2 It is an important means to wait for greenhouse gases. Although lean-burn gasoline vehicles and diesel vehi...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01J23/08
Inventor 郝吉明罗永明傅立新朱天乐
Owner TSINGHUA UNIV
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