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Selective catalytic reduction catalyst for diesel vehicle exhaust purification and preparation method thereof

An exhaust gas purification and selectivity technology, applied in the field of selective catalytic reduction catalyst for diesel vehicle exhaust gas purification and its preparation, can solve problems such as poor catalytic activity, reduce production cost, improve catalyst activity and high activity Effect of window, high active temperature window

Inactive Publication Date: 2015-01-21
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst has poor catalytic activity at low temperatures below 200 °C

Method used

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  • Selective catalytic reduction catalyst for diesel vehicle exhaust purification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A cordierite honeycomb ceramic carrier with a diameter of 76.2mm and a height of 50mm and a cell density of 400cpsi was placed in a drying oven at 110°C to dry, and then purged. Weigh 300g of deionized water, add 60g of γ-Al to the aqueous solution 2 o 3 , 140gTiO 2 powder, and adjust the pH value to 4 under stirring at room temperature to prepare coating slurry. Then upload and purge on the automatic coating machine, and finally dry at 110°C for 8 hours, and bake at 500°C for 4 hours.

[0023] Weigh 1.32g of ammonium metavanadate and dissolve it in 52g of oxalic acid, impregnate the active component on the coated carrier by equal volume impregnation method, dry at 110°C for 8 hours, bake at 500°C for 4 hours, then weigh 3.3 Dissolve g ammonium molybdate in 52g water, impregnate by equal volume impregnation method, dry at 110°C for 8 hours, roast at 500°C for 4 hours, finally weigh 7.03g manganese nitrate and dissolve in 45g water, impregnate by equal volume impregna...

Embodiment 2

[0025] The preparation method is the same as that of Example 1, except that the addition of manganese nitrate is 11.25g to obtain catalyst 2# of the present invention.

Embodiment 3

[0027] Preparation method is the same as embodiment 1, and difference is that the add-on of ammonium metavanadate is 2.2g, makes catalyst 3# of the present invention

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Abstract

The invention relates to an integrated selective catalytic reduction catalyst for diesel vehicle exhaust purification and a preparation method thereof. The catalyst consists of a carrier, a coating coated on the carrier and catalytic active ingredients loaded on the coating. Cordierite honeycomb ceramic is used as the carrier; double oxides of gamma-Al2O3 and TiO2 are used as coating materials; and V2O5, MnO2 and MoO3 are used as the active ingredients. Compared with the prior art, the activity and the chemical stability of the catalyst are improved, the catalytic activity temperature window is broadened, the load amount of the active ingredients is reduced, and the cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to an SCR catalyst used for exhaust purification of diesel vehicles in the field of environmental protection and a preparation method thereof, specifically using γ-Al 2 o 3 and TiO 2 The double oxide is the coating material, and the coating is loaded on the cordierite honeycomb ceramic carrier, and then V is loaded on the coating 2 o 5 , MnO 2 and MoO 3 The active component is used to prepare a V-Mo-Mn based SCR catalyst, which has high activity for selective catalytic reduction of nitrogen oxides at low temperature and has a wide activity temperature window. Background technique [0002] Nitrogen oxides (NO x ) mainly comes from the combustion process of vehicle exhaust, thermal power plants and other industrial fossil fuels. With the rapid development of the motor vehicle industry and the huge consumption of electricity and industrial fossil fuels in recent years, NO x Emissions are becoming more and more serious, and env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J37/025B01D53/94B01D53/56
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 卢冠忠朱增赞周坚刚张蓓郭耘郭杨龙张志刚
Owner EAST CHINA UNIV OF SCI & TECH