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Diesel vehicle tail gas purifying catalyst and preparation method thereof

An exhaust gas purification and catalyst technology, which is applied in the field of catalyst preparation and vanadium-based SCR catalyst preparation, can solve the problems of high production cost and poor high temperature aging resistance, and achieve the effects of improving performance, enhancing anti-aging performance and good removal rate.

Active Publication Date: 2013-08-28
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the practical application of this technology, such as high manufacturing cost and poor high temperature aging resistance

Method used

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  • Diesel vehicle tail gas purifying catalyst and preparation method thereof
  • Diesel vehicle tail gas purifying catalyst and preparation method thereof
  • Diesel vehicle tail gas purifying catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 3%V 2 o 5 -2%CeO 2 / TiO 2 -SiO 2 -WO 3 Catalyst preparation

[0027] ①Dissolve 13.03g of oxalic acid in 80g of deionized water, add 7.712g of ammonium metavanadate after the oxalic acid is completely dissolved, heat and stir in a water bath at 40-50°C for 1-2 hours, and form a blue solution.

[0028] ②Dissolve 7.305g of cerium nitrate in 17.816g of deionized water to form a 41% cerium nitrate solution, then add it to the solution prepared in step ①, heat and stir in a water bath at 40-50°C for 1-2 hours.

[0029] ③Adjust the volume of the solution in ②to make the total volume 171ml, then add 190g of titanium silicon tungsten powder to the solution obtained in step ②, stir for 1-3 hours to obtain dark blue fine powder.

[0030] ④Put the powder obtained in step ③ into an oven, stay at 60-80°C for 2 hours, and then dry at 120°C for 24 hours.

[0031] ⑤Put the dried powder in step ④ into the muffle furnace and bake at 500-600°C for 3-4 hours to obtain 3% V 2 o 5 -2%C...

Embodiment 2

[0034] 3%V 2 o 5 -5%CeO 2 / TiO 2 -SiO 2 -WO 3 Catalyst preparation

[0035] ① Dissolve 13.03g of oxalic acid in 80g of deionized water, add 7.712g of ammonium metavanadate after the oxalic acid is completely dissolved, heat and stir in a water bath at 40-50°C for 1-2 hours, and form a blue solution.

[0036] ②Dissolve 18.263g of cerium nitrate in 44.54g of deionized water to form a 41% cerium nitrate solution, then add it to the solution prepared in step ①, heat and stir in a water bath at 40-50°C for 1-2 hours.

[0037] ③ Adjust the volume of the solution in ② to make the total volume 165.6ml, then add 184g of titanium silicon tungsten powder to the solution obtained in step ②, stir for 1-3 hours to obtain a dark blue fine powder.

[0038] ④Put the powder obtained in step ③ into an oven, stay at 60-80°C for 2 hours, and then dry at 120°C for 24 hours.

[0039] ⑤Put the dried powder in step ④ into the muffle furnace and bake at 500-600°C for 3-4 hours to obtain 3% V 2 ...

Embodiment 3

[0042] 3%V 2 o 5 -8%CeO 2 / TiO 2 -SiO 2 -WO 3 Catalyst preparation

[0043] ① Dissolve 13.03g of oxalic acid in 80g of deionized water, add 7.712g of ammonium metavanadate after the oxalic acid is completely dissolved, heat and stir in a water bath at 40-50°C for 1-2 hours, and form a blue solution.

[0044] ②Dissolve 29.22g of cerium nitrate in 71.264g of deionized water to form a 41% cerium nitrate solution, then add it to the solution prepared in step ①, heat and stir in a water bath at 40-50°C for 1-2 hours.

[0045] ③Adjust the volume of the solution in ②to make the total volume 160.2ml, then add 178g of titanium silicon tungsten powder to the solution obtained in step ②, stir for 1-3 hours to obtain dark blue fine powder.

[0046] ④Put the powder obtained in step ③ into an oven, stay at 60-80°C for 2 hours, and then dry at 120°C for 24 hours.

[0047] ⑤Put the dried powder in step ④ into the muffle furnace and bake at 500-600°C for 3-4 hours to obtain 3% V 2 o 5...

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Abstract

The invention discloses a diesel vehicle tail gas purifying catalyst and a preparation method thereof. The catalyst is shown as follows: V2O5-CeO2 / TiO2-SiO2-WO3, wherein TiO2-SiO2-WO3 is a titanium-silicon-tungsten composite oxide carrier; V2O5 is 3% (in percentage by weight) of the carrier in weight and CeO2 is 2%-8% of the carrier in weight. The preparation method of the diesel vehicle tail gas purifying catalyst comprises the following steps of: dipping and loading the active ingredients on the carrier by using the titanium-silicon-tungsten composite oxide as the catalyst carrier material, drying and roasting to form catalyst powder; and preparing the catalyst powder into slurry for coating on a ceramic base body to form an integral catalyst. According to the diesel vehicle tail gas purifying catalyst and the preparation method thereof disclosed by the invention, precursor cerium nitrate of the second active ingredient cerium dioxide is added for bringing the concerted catalysis effects of the active ingredients into play by optimizing primary and secondary active ingredients of the catalyst. The catalyst disclosed by the invention can be used for effectively improving the performances of the catalyst, lowering the initiation temperature of NOx to 180 DEG C, expanding a full conversion window and strengthening anti-ageing performances of the catalyst. Meanwhile, the catalyst has a good removing rate to NOx under a high-sulfur high-humidity environment.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to the technical field of vanadium-based SCR catalyst preparation. Background technique [0002] Diesel vehicles are more and more widely used due to their low fuel consumption and high power. However, due to the high temperature and high pressure in the diesel engine cylinder, the nitrogen oxides NO x caused serious environmental problems. The existing three-way catalyst used to treat nitrogen oxides in gasoline vehicle exhaust loses the effect of purifying exhaust gas because the catalytic reduction ability of the catalyst to nitrogen oxides decreases sharply under the condition of high air-fuel ratio. However, my country has raised the emission standards for diesel vehicles, and it is even more necessary to use diesel engine technology to control nitrogen oxides NO. x emissions. Therefore, how to effectively purify NO in diesel vehicle exhaust x It has become an ...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/94
Inventor 廖传文
Owner SINOCAT ENVIRONMENTAL TECH
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