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Catalyst for selectively reducing NOx by ammonia with high thermal stability and preparation method thereof

A technology for nitrogen oxides and catalysts, applied in the field of environmental pollution control, can solve the problems of reducing the activity of catalysts for selective reduction of nitrogen oxides by ammonia, flue gas and diesel vehicle exhaust temperature fluctuations, poor thermal stability of catalysts, etc. Chemical application prospect, good anti-sulfur and water resistance, good low temperature activity effect

Active Publication Date: 2018-09-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN10449245A reports a kind of MnO X and different contents of rare earth oxides, although the catalyst exhibits good low-temperature activity and water and sulfur resistance, but the thermal stability is poor. -1 Under the condition of space velocity, the temperature window where the NOx conversion rate is higher than 80% is only 180-280°C
[0005] Although the catalysts listed above have good low-temperature catalytic activity, the ammonia-selective nitrogen oxide reduction activity of the catalyst will be significantly reduced after the catalyst is roasted at high temperature during the preparation process, resulting in narrowing of the temperature window. Poor stability
In the actual application process, due to the instability of the actual working conditions, there are certain fluctuations in the temperature of flue gas and diesel vehicle exhaust, which will generate instantaneous high temperature, so the catalyst is required to have a certain high temperature stability

Method used

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Effect test

Embodiment 1

[0021] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:

[0022] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 2.4gTi 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.05. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally ro...

Embodiment 2

[0026] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:

[0027] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 14.4g Ti 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.3. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally r...

Embodiment 3

[0030] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:

[0031] Weigh 9g Sm(NO 3 ) 3 ·6H 2 O, 30g MnSO 4 and 33.6g Ti 2 (SO 4 ) 3 Dissolved in deionized water to make a mixed solution, the Sm / Mn / Ti metal molar ratio is 0.1 / 1 / 0.7. Preset 100mL deionized water in the beaker, slowly add 0.2M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 hours, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was dried in an oven at 110°C, and finally r...

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PUM

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Abstract

The invention relates to a manganese-based composite oxide catalyst for selectively reducing NOx by ammonia with high thermal stability and high low-temperature activity and a preparation method thereof. The catalyst can be applied to purification of NOx in flue gas from factories and vehicle tail gas. The catalyst is prepared with manganese oxide as an active component and samarium and other transit metals as cocatalysts, thus forming the ternary metal composite oxide catalyst. The catalyst is used for a reaction of selectively catalytically reducing NOx by ammonia and has very wide temperature window at a low temperature. After being roasted at 500-650 DEG C, the catalyst can reach more than 80% in NOx removal rate in a temperature range of 50 to 300 DEG C. The catalyst also has strong anti-water and anti-sulfur-poisoning capability. The preparation method is simple and low-cost, and has excellent application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of an ammonia selective catalytic reduction catalyst used for removing nitrogen oxides in power plant boilers, various industrial furnaces and motor vehicle tail gases, and belongs to the field of environmental pollution control. Background technique [0002] At present, my country's energy structure is dominated by coal. According to statistics, thermal power installed capacity accounts for more than 74% of my country's installed power generation capacity. pollute. Among various flue gas denitrification technologies such as selective catalytic reduction, selective non-catalytic reduction, and nitrogen oxide storage and reduction, the most widely used and most mature technology is the selective catalytic reduction method, which has high efficiency and great impact on boilers. The advantages of little modification of the original equipment, etc., the technology has achieved large-scale indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01D2258/01B01D2258/0283B01J23/002B01J23/34B01J2523/00B01J2523/3737B01J2523/47B01J2523/72B01J2523/48
Inventor 詹望成陈艺元方知临郭杨龙郭耘王丽王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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