Flue gas denitrification catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of small active temperature range, high catalyst cost, and human health hazards, and achieve high water and sulfur resistance. Effect of improving oxygen storage capacity and redox capacity and improving dispersibility

Inactive Publication Date: 2015-03-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are still some problems in the application of these catalysts: 1) the active temperature range is small; 2) the vanadium component in the catalyst has certain hazards to human health; 3) the formation of N 2 High activity of O, N 2 The emission of O will pollute the atmosphere; 4) it is easy to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix nitric acid, cerium nitrate, ammonium molybdate, deionized water and absolute ethanol in a mass ratio of 9.45:4.01:1.949:54~180:46.0~230.0, stir for 0.5~1 hour to obtain a transparent solution; butyl titanate Mix with absolute ethanol at a mass ratio of 34.04:92.0 to 230.0, stir for 0.5 to 1 hour to obtain a light yellow solution, then gradually add to the transparent solution prepared in the previous step, and stir for 2 to 10 hours to obtain a transparent sol. Dry the obtained transparent sol at 80°C for 24 hours to obtain a xerogel, grind and sieve the obtained xerogel, and then calcinate it in an air atmosphere at 500°C for 5 hours to obtain CeO 2 : MoO 3 :TiO 2 A catalyst with a mass ratio of 20:20:100. Get this catalyst 0.333ml, carry out nitrogen oxide reduction treatment to the simulated flue gas that is made up of nitrogen monoxide (1000ppm), ammonia (1000ppm), oxygen (3%) and nitrogen, the total flow rate of mixed gas is 500ml / min, reaction The airspeed...

Embodiment 2

[0016] Mix nitric acid, cerium nitrate, ammonium molybdate, deionized water and absolute ethanol in a mass ratio of 9.45:4.01:1.462:54~180:46.0~230.0, and stir for 0.5~1 hour to obtain a transparent solution; butyl titanate Mix with absolute ethanol at a mass ratio of 34.04:92.0 to 230.0, stir for 0.5 to 1 hour to obtain a light yellow solution, then gradually add to the transparent solution prepared in the previous step, and stir for 2 to 10 hours to obtain a transparent sol. Dry the obtained transparent sol at 80°C for 24 hours to obtain a xerogel, grind and sieve the obtained xerogel, and then calcinate it in an air atmosphere at 500°C for 5 hours to obtain CeO 2 : MoO 3 :TiO 2 A catalyst with a mass ratio of 20:15:100. Get this catalyst 0.333ml, carry out nitrogen oxide reduction treatment to the simulated flue gas that is made up of nitrogen monoxide (1000ppm), ammonia (1000ppm), oxygen (3%) and nitrogen, the total flow rate of mixed gas is 500ml / min, reaction The airs...

Embodiment 3

[0018] Mix nitric acid, cerium nitrate, ammonium molybdate, deionized water and absolute ethanol in a mass ratio of 9.45:4.01:0.975:54~180:46.0~230.0, stir for 0.5~1 hour to obtain a transparent solution; butyl titanate Mix with absolute ethanol at a mass ratio of 34.04:92.0 to 230.0, stir for 0.5 to 1 hour to obtain a light yellow solution, then gradually add it to the transparent solution prepared in the previous step, and stir for 2 to 10 hours to obtain a transparent sol; The sol was dried at 80°C for 24 hours to obtain a xerogel, which was ground and sieved and then calcined in an air atmosphere at 500°C for 5 hours to obtain CeO 2 : MoO 3 :TiO 2 A catalyst with a mass ratio of 20:10:100. Get 0.333ml of this catalyst, carry out nitrogen oxide reduction treatment to the simulated flue gas that is made up of nitric oxide (1000ppm), ammonia (1000ppm), oxygen (3%) and nitrogen, the total flow rate of mixed gas is 500ml / min, the reaction The airspeed is 90000h -1 , in the ...

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Abstract

The invention discloses a flue gas denitrification catalyst and a preparation method thereof. The flue gas denitrification catalyst comprises a carrier component TiO2, an active component CeO2 and an assistant MoO3, wherein the mass of the CeO2 accounts for 5-20wt percent of that of the TiO2, and the mass of the MoO3 accounts for 1-20wt percent of that of the TiO2. According to the flue gas denitrification catalyst, anatase type titanium dioxide is used as a carrier, and by adopting a sol-gel method, the active component cerium oxide and a cocatalyst molybdenum trioxide are loaded on the carrier. The catalyst is a selective reduction denitrification catalyst with the good activity, in a range of 300-450 DEG C, the NO conversion rate of more than 90 percent can be maintained and relatively high water-resisting and sulphur-resisting performances are obtained; at a temperature of 350 DEG C, after sulfur dioxide and water vapor are introduced for 7.5h, the NO conversion rate can be kept more than 80 percent, and after the introduction of the sulfur dioxide and the water vapor is stopped, the NO conversion rate is recovered to be 97 percent.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a TiO 2 A flue gas denitrification catalyst loaded with cerium and molybdenum and a preparation method thereof. Background technique [0002] At present, the air pollution situation in our country is very serious. While the traditional soot-type pollution has not been controlled, the regional composite air pollution characterized by ozone, fine particulate matter (PM2.5) and acid rain is becoming more and more prominent, seriously restricting the social economy. sustainable development, threatening the health of the people. Nitrogen oxides (NO x ) is one of the important causes of air pollution such as ozone, fine particulate matter, and acid rain. How to effectively control the emission of nitrogen oxides has become one of the important topics in the field of air pollution control in my country. On July 29, 2011, my country issued the newly revised "Emission Sta...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01D53/90B01D53/56
Inventor 姜烨黄善波林日亿冯洪庆邢志敏王雪冲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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