Integral catalyst for NOx selective catalytic reduction and preparation method thereof

A monolithic catalyst and catalyst technology, applied in the field of environmental pollution control, can solve the problems of narrow operating window, health and toxicity of alum compounds, etc., and achieve the effects of low load shedding rate, simple preparation method and high loading rate

Active Publication Date: 2011-03-09
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, due to its inevitable disadvantages in practical applications, narrow operating window, and the toxicity of alum c

Method used

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  • Integral catalyst for NOx selective catalytic reduction and preparation method thereof
  • Integral catalyst for NOx selective catalytic reduction and preparation method thereof

Examples

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Embodiment Construction

[0021] Implementation example 1:

[0022] 12g Mn(NO 3 ) 2 , 55g Al 2 o 3 , 100g deionized water, under the condition of mechanical stirring, add 5mL concentrated nitric acid, adjust the pH to 3-4, stir for 0.5-2 hours, after the slurry is stable. Under vacuum conditions, the slurry is coated on the cordierite ceramic carrier, soaked for 15-30min, and excess slurry is removed with compressed air. Then dry at room temperature for 12 hours, and calcined at 500-800°C for 2 hours to obtain the desired catalyst.

[0023] Implementation example 2:

[0024] 12g Mn(NO 3 ) 2 , 13 g H 3 o 40 PW 12 ·xH 2 O, 55g Al 2 o 3 , 100g deionized water, under the condition of mechanical stirring, add 5mL concentrated nitric acid, adjust the pH to 3-4, stir for 0.5-2 hours, after the slurry is stable. Under vacuum conditions, the slurry is coated on the cordierite ceramic carrier, soaked for 15-30min, and excess slurry is removed with compressed air. Then dry at room temperature for 1...

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Abstract

The invention relates to an integral catalyst for NOx selective catalytic reduction and a preparation method thereof, which are mainly applied in tail gas purification of motor vehicles and the tail gas purification of plant flues and belong to the field of environmental pollution control. The integral catalyst consists of two parts of a dichroite honeycomb ceramic carrier and a coating loaded with a catalytic active component, wherein the coating consists of active aluminum oxide and a transition metal oxide. The aluminum oxide coating loaded with the active component is coated on the dichroite honeycomb ceramic carrier by adopting the coating method, and the prepared catalyst has good reaction activity and stability. The 50% conversion temperature of NOx is 100-160 DEG C, the 100% conversion temperature of the NOx is 180 DEG C, and the temperature range of complete conversion is 180-320 DEG C.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental pollution control, and relates to an integral catalyst for selective catalytic reduction of NOx and a preparation method thereof. 2. Technical Background [0002] Nitrogen oxide (NOx) is one of the main air pollutants, mainly from power plant flue gas and motor vehicle exhaust, which is very harmful to the atmospheric environment and human activities, and has attracted widespread attention from all over the world. At present, the most researched NOx elimination catalyst is mainly the selective catalytic reduction (SCR) of NOx under the condition of low temperature and rich oxygen, in which V 2 o 5 -WO 3 / TiO 2 Catalysts have been used practically in the elimination of NOx. However, due to its inevitable disadvantages in practical applications, narrow operating window, and the toxicity of alum compounds to the natural environment and human health, more and more research has focused on ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/34B01D53/90B01D53/56
Inventor 张志刚杨青山卢冠忠郭耘詹望成郭杨龙王筠松蔡丽莉
Owner EAST CHINA UNIV OF SCI & TECH
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