Preparation method of SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of diesel vehicle

A catalyst, diesel vehicle technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problems such as poor performance, to achieve the effects of easy operation, improved distribution, and wide temperature window

Inactive Publication Date: 2012-04-18
广州市威格林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the noble metal system, Pt-based catalysts are generally used. This type of catalyst is characterized by good low-temperature activity, but poor selectivity and high price; molecular sieve catalysts are mainly represented by Cu / ZSM-5, and this type of catalyst is at (300-400 o C) The interval has excellent NOx removal efficiency, but its hydrothermal stability is relatively poor; the oxide catalyst is mainly a vanadium series catalyst, this type of catalyst (300-400 o C) The interval has high NOx removal efficiency and has excellent stability
Considering the various performances and production costs of catalysts, vanadium series catalysts are widely used in the industry at present. However, the low-temperature activity of these catalysts is not high enough. Optimize or find a new catalyst to replace to improve the low-temperature activity of the catalyst and meet the emission requirements of diesel vehicles

Method used

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  • Preparation method of SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of diesel vehicle
  • Preparation method of SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of diesel vehicle
  • Preparation method of SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of diesel vehicle

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation V 2 o 5 / WO 3 / TiO 2 : First, put 0.03-0.06mol titanium dioxide carrier 300-400 o C roasting for 2-5 hours, then dissolve 0.001-0.004 mol ammonium metavanadate and 0.0001-0.0003 mol ammonium metatungstate in deionized water, and add 0.003-0.008 mol oxalic acid, stir and mix evenly to obtain the active component solution, the concentration of ammonium metavanadate in the active component solution is 0.2-0.5mol / L, the concentration of ammonium metatungstate is 0.01-0.02mol / L, and the concentration of oxalic acid is 0.3-0.8mol / L; Titanium dioxide was added to the above active component solution, and after natural drying, it was heated at 80-120 o C drying 8-12 hours, 300~600 o C roasting for 2~5 hours, finally at 500-670 o C is calcined for 2-5 hours to obtain the target catalyst.

Embodiment 2

[0037] Prepare 1-V 2 o 5 / WO 3 / TiO 2 : First, put 0.03-0.06mol titanium dioxide carrier 300-400 oC roasting for 2-5 hours, then dissolve 0.001-0.004 mol ammonium metavanadate and 0.0001-0.0003 mol ammonium metatungstate in deionized water, and add 0.003-0.008 mol oxalic acid, stir and mix evenly to obtain the active group Separate the solution, the concentration of ammonium metavanadate in the active component solution is 0.2-0.5mol / L, the concentration of ammonium metatungstate is 0.01-0.02mol / L, and the concentration of oxalic acid is 0.3-0.8mol / L; then roast The final titanium dioxide was added to the above-mentioned active component solution, and after natural drying, it was dried at 80-120 o C drying 8-12 hours, 300~600 o C roasting for 2~5 hours, finally at 680-800 o C is calcined for 2-5 hours to obtain the target catalyst.

Embodiment 3

[0039] Prepare 2-V 2 o 5 / WO 3 / TiO 2 : First, put 0.03-0.06mol titanium dioxide carrier 300-400 o C roasting for 2-5 hours, then dissolve 0.001-0.004 mol ammonium metavanadate and 0.0001-0.0003 mol ammonium metatungstate in deionized water, and add 0.003-0.008 mol oxalic acid, stir and mix evenly to obtain the active group Separate the solution, the concentration of ammonium metavanadate in the active component solution is 0.2-0.5mol / L, the concentration of ammonium metatungstate is 0.01-0.02mol / L, and the concentration of oxalic acid is 0.3-0.8mol / L; then roast The final titanium dioxide was added to the above solution, and dried naturally at 80-120 o C drying 8-12 hours, 300~600 o C roasting for 2~5 hours, finally at 820-900 o C is calcined for 2-5 hours to obtain the target catalyst.

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Abstract

The invention discloses a preparation method of an SCR (Selective Catalytic Reduction) vanadium-series catalyst used in denitration of tail gas of a diesel vehicle. Active ingredients are introduced into the catalyst by adopting a simple soaking method, and a catalyst carrier or the catalyst is baked at different temperatures, so that the catalytic performance of the obtained SCR vanadium-series catalyst is improved remarkably, the catalytic activity is greatly increased, and the intensity of the catalyst is greatly increased. The vanadium-series denitration catalyst provided by the inventionhas high denitration efficiency and a wide temperature window, and is suitable for the field of desorption of nitrogen oxides in the tail gas of the diesel vehicle. As proved by the simulated tail gas evaluation of the diesel vehicle in a laboratory, the NOx removing rate of the SCR vanadium-series catalyst prepared with the method is over 90 percent under the condition that the space speed is 30,000 h<-1>, the NO content is 500 ppm and the H2O content is 4 percent at the temperature of 170-469 DEG C.

Description

technical field [0001] The invention belongs to the field of catalytic materials for denitrification of diesel vehicle tail gas, and in particular relates to a preparation method of an SCR vanadium series denitrification catalyst used for denitrification of diesel vehicle tail gas. [0002] Background technique [0003] The pollution of nitrogen oxides (NOx) to the atmosphere is a worldwide problem. With the development of China's automobile industry, China's nitrogen oxides continue to intensify. Studies have shown that in 2010, my country's automobile NOx emissions were about 6 million tons, of which heavy-duty diesel vehicles, which accounted for less than 5% of the total number of automobiles, emitted about 74% of NOx. The "Twelfth Five-Year Plan" requires that by the end of the "Twelfth Five-Year Plan", the total emissions of nitrogen oxides will be reduced by 10% compared with 2010. According to the forecast of relevant experts from the Ministry of Environmental Prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 赵向云萧剑鸣韩晖汪加林范群
Owner 广州市威格林环保科技有限公司
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