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Denitrification copper radical molecular sieve catalyst as well as preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of nitrogen oxide reduction catalyst preparation in environmental protection, can solve problems such as poor hydrothermal stability, achieve high water stability, and improve the effect of hydrothermal stability

Inactive Publication Date: 2014-09-03
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the poor hydrothermal stability of Cu-based zeolites is also attributed to the easy formation of copper-aluminum compounds
[0006] So far, although the hydrothermal stability of zeolite-based catalysts is an urgent problem to be solved for their application in diesel vehicle exhaust treatment, there are few reports on the solution to this problem.

Method used

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  • Denitrification copper radical molecular sieve catalyst as well as preparation method and application thereof
  • Denitrification copper radical molecular sieve catalyst as well as preparation method and application thereof
  • Denitrification copper radical molecular sieve catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation of embodiment 1 Cu-ZSM-5-CLD sample

[0057] Add ZSM-5 to ammonium nitrate solution, stir at 80 °C for 1 h, then filter and wash with deionized water to obtain NH 4+ form, and then the resulting NH at 100 °C 4+ / ZSM-5 was dried for 16 hours, and finally the above steps were repeated twice to make the ammonia exchange fully. NH 4+ / ZSM-5 added to Cu(CH 3 COO) 2 The solution was stirred for 8h, in which Cu(CH 3 COO) 2The concentration of Cu should be small to avoid Cu accumulating on the surface and pores of molecular sieves. The resulting samples were then filtered and rinsed with deionized water, then dried at 100 °C for 16 h, and finally calcined at 550 °C for 5 h in an air atmosphere.

[0058] The surface modification of the Cu-ZSM-5 molecular sieve catalyst prepared above was carried out by using the liquid phase deposition method. The specific process was as follows: 1g of the catalyst was added to 25mL of n-hexane, and then 0.15mL of tetraeth...

Embodiment 2

[0061] The preparation of embodiment 2Cu-MOR sample

[0062] MOR was added to the ammonium nitrate solution, stirred at 80 °C for 1 h, then filtered and washed with deionized water to obtain NH 4+ form, and then the resulting NH at 100 °C 4+ / MOR drying for 16 hours, and finally repeat the above steps twice to make ammonia exchange sufficient. NH 4+ / MOR added to Cu(NO 3 ) 2 The solution was stirred for 8h, in which Cu(NO 3 ) 2 The concentration of Cu should be small to avoid Cu accumulating on the surface and pores of molecular sieves. The resulting samples were then filtered and rinsed with deionized water, then dried at 100 °C for 16 h, and finally calcined at 550 °C for 5 h in an air atmosphere.

[0063] The Cu-MOR molecular sieve catalyst prepared above was surface-modified by the liquid phase deposition method, and the specific process was as follows: 1 g of the catalyst was added to 30 mL of isohexane, and then 0.15 mL of tetraethylorthosilicate was added thereto...

Embodiment 3

[0064] The preparation of embodiment 3Cu-BEA sample

[0065] BEA was added to the ammonium nitrate solution, stirred at 80 °C for 1 h, then filtered and washed with deionized water to obtain NH 4+ form, and then the resulting NH at 100 °C 4+ / BEA was dried for 16 hours, and finally the above steps were repeated twice to make the ammonia exchange sufficient. NH 4+ / BEA added to CuSO 4 The solution was stirred for 8h, in which CuSO 4 The concentration of Cu should be small to avoid Cu accumulating on the surface and pores of molecular sieves. The resulting samples were then filtered and rinsed with deionized water, then dried at 100 °C for 16 h, and finally calcined at 500 °C for 4 h in an air atmosphere.

[0066] The surface of Cu-BEA molecular sieve catalyst prepared above was modified by liquid phase deposition method. The specific process was as follows: 1 g of catalyst was added to 25 mL of n-pentane, and then 0.20 mL of tetraethylorthosilicate was added thereto. Then...

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Abstract

The invention discloses a denitrification copper radical molecular sieve catalyst as well as a preparation method and an application thereof and relates to the technical field of NOx reduction catalysts. The catalyst is a molecular catalyst which has high hydrothermal stability and is used for selective copper radical reduction of diesel engine car exhaust NOx. The preparation method comprises the following steps: with a commercial molecular sieve as a carrier, preparing a copper radical molecular sieve catalyst through an ion exchange method; coating a layer of inert silicon dioxide thin film on the surface of the catalyst through a chemical liquid phase deposition method, and finally drying and calcining the obtained sample to obtain the copper radical sieve catalyst with high hydrothermal stability. Compared with a copper radical sieve catalyst before treatment, through the prepared reduction catalyst, a relatively high NOx catalytic conversion efficiency and a relatively wide active temperature window can still be obtained after the prepared reduction catalyst is hydrothermally aged at the temperature of 750 DEG for 13 hours, the problem that the copper radical sieve catalyst is poor in hydrothermal stability is solved, the purpose of controlling emission of nitric oxide in diesel engine car exhaust is realized and good environment effect is achieved.

Description

technical field [0001] The invention relates to a denitrification copper-based molecular sieve catalyst, a preparation method and its use, in particular to a highly hydrothermally stable diesel vehicle exhaust nitrogen oxide selective reduction copper-based molecular sieve catalyst, a preparation method and its use, belonging to the environmental protection industry The technical field of nitrogen oxide reduction catalyst preparation. Background technique [0002] Diesel engines have low fuel consumption, high efficiency and good reliability, and are widely used in agriculture and transportation. The diesel engine belongs to the compression ignition engine, which injects the diesel oil into the air that has been compressed to a very high temperature by high pressure, mixes it with the high temperature air to form a combustible mixture, and automatically ignites and burns. Therefore, the mixture of oil and gas cannot be as uniform as that of a gasoline engine. Despite the e...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J29/14B01J29/76B01J29/24B01D53/94B01D53/56
Inventor 刘坚赵震张涛于富红韦岳长
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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