SCR deNOx catalyst added with attapulgite and preparation method thereof

A denitrification catalyst and attapulgite technology, which is applied in the field of SCR denitrification catalyst and its preparation, can solve the performance problems of SCR catalysts that have not yet been added with attapulgite

Inactive Publication Date: 2010-10-20
石磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no research and literature report on adding attapulgite to improve the performance of SCR catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The high-viscosity attapulgite is purified to 70% by dry method and ground to 400 mesh. Attapulgite, titanium dioxide, active components and forming aids are mixed with water at a mass ratio of 15:72:9:4 for high-speed stirring, filtered after homogenization, and then fully mixed with a mixer. The slurry after mixing is formed by an extruder, and the number of holes is 18×18, the section is 150mm×150mm, the wall thickness is 1.2mm, and the pitch is 8.2mm. Dry at 50% humidity and 43°C to obtain a catalyst blank. The blank is sent to the sintering furnace for sintering, the temperature is programmed to rise from 120°C, the heating rate is controlled at 1°C / min, and the temperature is kept at 450°C for 0.5-4 hours. The cooling rate is controlled to be less than 5°C / min, and when the temperature is less than 50°C, the finished product is obtained. The finished product has a porosity rate of 82.1%, and a specific surface area of ​​504m 2 / m 3 , Mechanical strength 213N / c...

Embodiment 2

[0032] The high-viscosity attapulgite is purified to 90% by wet method and ground to 400 mesh. Attapulgite, titanium dioxide, active components and forming aids are mixed with water at a mass ratio of 15:72:9:4 for high-speed stirring, filtered after homogenization, and then fully mixed with a mixer. The slurry after mixing is formed by an extruder, and the number of holes is 18×18, the section is 150mm×150mm, the wall thickness is 1.2mm, and the pitch is 8.2mm. Dry at 50% humidity and 43°C to obtain a catalyst blank. The blank is sent to the sintering furnace for sintering, the temperature is programmed to rise from 120°C, the heating rate is controlled at 1°C / min, and the temperature is kept at 450°C for 0.5-4 hours. The cooling rate is controlled to be less than 5°C / min, and when the temperature is less than 50°C, the finished product is obtained. The finished product has a porosity rate of 87.9% and a specific surface area of ​​524m 2 / m 3 , mechanical strength 243N / cm...

Embodiment 3

[0035]The adsorption type attapulgite is purified to 60% by dry method and ground to 400 mesh. Attapulgite, titanium dioxide, active components and forming aids are mixed with water at a mass ratio of 15:72:9:4 for high-speed stirring, filtered after homogenization, and then fully mixed with a mixer. The slurry after mixing is formed by an extruder, and the number of holes is 18×18, the section is 150mm×150mm, the wall thickness is 1.2mm, and the pitch is 8.2mm. Dry at 50% humidity and 40°C to obtain a catalyst blank. The blank is sent to the sintering furnace for sintering, the temperature is programmed to rise from 120°C, the heating rate is controlled at 1°C / min, and the temperature is kept at 450°C for 0.5-4 hours. The cooling rate is controlled to be less than 5°C / min, and when the temperature is less than 50°C, the finished product is obtained. The finished product has a porosity rate of 68.1%, and a specific surface area of ​​423m 2 / m 3 , Mechanical strength 167N / c...

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Abstract

The invention relates to a method for preparing an SCR deNOx catalyst added with attapulgite, which comprises the following steps of: (1) purifying the attapulgite by adopting a dry or wet method to make the purity of the attapulgite reach over 60 percent, and dispersing attapulgite crystal fibers; (2) adding water to the purified attapulgite, titanium dioxide, active ingredients and a forming aid in a certain ratio, performing high-speed stirring, homogenizing, filtering, and fully mixing the raw materials by using a mixing mill; (3) forming the mixed slurry by using an extruder according to engineering requirement; and (4) drying at certain humidity and temperature to obtain a catalyst blank, and sintering the blank in a sintering furnace to obtain the finished product. The invention also relates to the SCR deNOx catalyst prepared by the method. The attapulgite is added to form a pore structure in the SCR deNOx catalyst, so that the catalyst has elasticity and thermal stress resistance, and can be used for removing NOx from flue gas of heat-engine plants and industrial stoves.

Description

technical field [0001] The invention relates to a catalyst, in particular to an SCR denitrification catalyst used in thermal power plants and industrial kiln flue gas and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants except smoke and sulfur dioxide, and their discharge will cause danger to the natural environment and human health. The technology and policy research on nitrogen oxide emission reduction in foreign countries has a history of about 30 years. During the "Eleventh Five-Year Plan" period, my country began to reduce nitrogen oxide emissions, especially for the Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta regions where nitrogen oxide pollution is serious. Since the nitrogen oxides emitted by the thermal power generation industry account for about 40% of my country's total emissions, the "2009-2010 National Pollution Prevention and Control Work Key Points" requires that after 2...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J37/00B01D53/86B01D53/56
Inventor 石磊
Owner 石磊
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