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Catalyst for selective reduction of No by propylene in oxygen-rich condition and preparation method thereof

A catalyst and condition technology, which is applied in the preparation field of the above-mentioned catalyst, can solve the problems of low activity of the supported copper catalyst and the like

Inactive Publication Date: 2006-04-26
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Al obtained so far 2 o 3 The activity of supported copper catalysts is still low. According to literature reports, Cu / Al prepared by impregnation method is currently 2 o 3 The maximum conversion rate of NO on the catalyst is only about 40%, which has not been practically applied

Method used

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  • Catalyst for selective reduction of No by propylene in oxygen-rich condition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1: Cu / Al 2 o 3 The catalytic effect of the catalyst

[0026] Al 2 o 3 Preparation of supported copper catalyst:

[0027] 1. Al(NO 3 ) 3 9H 2 O was made into a 0.5 mol / L solution with deionized water, placed in a 50°C water bath and continued to stir, slowly dripped ammonia water until the solution pH ≈ 9, continued to stir at constant temperature for 2 hours, and aged at room temperature for 12 hours. Then suction filter, dry, and bake at 600°C for 4 hours to obtain Al 2 o 3 .

[0028] 2. The Al prepared above 2 o 3 With 0.62mol / L Cu(NO 3 ) 2 solution immersion for 24 hours, so that the Cu 2+ The loading amount is 3%, dried at 80°C for 6 hours, and then calcined at 500°C for 2 hours to obtain Al 2 o 3 Supported copper catalyst (abbreviated as Cu / Al 2 o 3 ).

[0029] The Cu / Al containing copper 3% prepared by the above-mentioned method 2 o 3 Catalyst, the reaction temperature is 100-600°C, the space velocity is 20000h -1 , The reaction was c...

example 2

[0032] Example 2: Cu / ZrO 2 -Al 2 o 3 The catalytic effect of the catalyst

[0033] Al(NO 3 ) 3 9H 2 O is made into a 0.5mol / L solution with deionized water, and then 0.2mol / L of ZrOCl is added 2 ·8H 2 O solution, stirred evenly, placed in a 50°C water bath and continued to stir, slowly dripped ammonia water to the solution pH≈9, then put the prepared sol in an autoclave, kept the temperature at 115°C for 24 hours, took it out and put It is steamed in a water bath at 60°C until it becomes viscous, dried at 115°C, and then calcined at 600°C for 4 hours to obtain ZrO 2 (10%)-Al 2 o 3 , and then loaded with 3% Cu according to the method of Example 1 2+ and make ZrO 2 -Al 2 o 3 Supported copper catalyst (abbreviated as Cu / ZrO 2 -Al 2 o 3 ).

[0034] The reaction conditions of propylene selective reduction NO under oxygen-enriched conditions are the same as example 1, and the conversion rate of NO is as table 2 under each reaction temperature

[0035] Reac...

example 3

[0037] Example 3: Cu / La 2 o 3 -ZrO 2 -Al 2 o 3 The catalytic effect of the catalyst

[0038] Al(NO 3 ) 3 9H 2 O was made into a 0.5mol / L solution with deionized water, and then 0.2mol / L of ZrOCl was added 2 ·8H 2 O solution and 0.1mol / L La(NO 3 ) 3 ·6H 2 O solution, stir well. Place in a water bath at 50°C and continue to stir continuously, slowly drop ammonia water until the solution pH is 9, then put the prepared sol in an autoclave, keep the temperature at 115°C for 24 hours, take it out and evaporate it in a water bath at 60°C until viscous, dried at 115°C, and then roasted at 600°C for 4 hours to obtain La 2 o 3 (4%)-ZrO 2 (10%)-Al 2 o 3 (86%) composite carrier, then by the method loading of example 1 on 3% Cu 2+ , and make La 2 o 3 -ZrO 2 -Al 2 o 3 Supported copper catalyst (abbreviated as Cu / La 2 o 3 -ZrO 2 -Al 2 o 3 ).

[0039] The reaction conditions for the selective reduction of NO by propylene under oxygen-enriched conditions are the sa...

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Abstract

The invention provides a catalyst for propylene to selective reduce NO on oxygen-enriched condition, which comprises: the La2O3-ZrO2-Al2O3 as complex carrier composed of 9-11% ZrO2, 3-5% La2O3 and 84-88% Al2O3; and 1-5wt% Cu2+ as active constituent. Wherein, the carrier is prepared by: synthesizing by hydrothermal method, dipping to modify by SO42-, drying, baking, dipping with Cu2+ solution, drying, and baking. This invention has NO conversion more than 84%, well moisture-proof and heat-proof properties and wide temperature operation range, and provides a practical approach to tail gas decontamination facility.

Description

Technical field [0001] The invention relates to a catalyst for selectively reducing NO (nitrogen monoxide) by propylene, in particular to a catalyst for selectively reducing NO by propylene under oxygen-enriched conditions. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. Background technique [0003] Since the lean-burn technology can significantly improve the utilization rate of fuel and save energy on the one hand, and can greatly reduce the emission of harmful substances such as CO and HC in the exhaust of motor vehicles on the other hand, since the 1990s, the world's lean-burn gasoline engines, diesel engines, etc. Engine designs and applications are on the rise. However, the lean burn process will inevitably produce more nitrogen oxides (NO x , of which NO accounts for more than 90%), resulting in NO x Air pollution is becoming more and more serious, directly endangering people's health and ecological environment. ...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01D53/56B01D53/86B01D53/94B01J23/72B01J23/83
Inventor 郭锡坤陈庆生
Owner SHANTOU UNIV
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