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Low-sulfur-resistant low-temperature carbon-based denitration catalyst as well as preparation method and application thereof

A denitration catalyst and low-temperature technology, applied in the field of flue gas denitrification, can solve the problems of complex preparation process, high energy consumption, high catalyst cost, etc., and achieve the effect of simple preparation method, high efficiency, low cost of raw materials and preparation

Pending Publication Date: 2021-02-26
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon-based support of the catalyst needs to contain H 2 and N 2 In a specific atmosphere with a volume ratio of 10%-50% and at a high temperature of 600-900°C, continuous activation for 0.5-2 h, the preparation process is relatively complicated, the energy consumption is high, the active components are required, the cost of the catalyst is high, and The spent vanadium-containing catalyst is difficult to handle

Method used

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  • Low-sulfur-resistant low-temperature carbon-based denitration catalyst as well as preparation method and application thereof
  • Low-sulfur-resistant low-temperature carbon-based denitration catalyst as well as preparation method and application thereof
  • Low-sulfur-resistant low-temperature carbon-based denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, the IAC of the impregnated activated carbon sample loaded with Mn and Fe is 5%Mn0.5%Fe / HAC.

[0034] For the preparation method of the low-sulfur-resistant low-temperature carbon-based denitration catalyst, refer to figure 1 ,Specific steps are as follows:

[0035] Step 1. Crushed, ground, and sieved coconut shell activated carbon to 25-40 mesh particles, washed 3-4 times with deionized water, and dried in an oven at 105°C for 12 hours to obtain sample AC.

[0036] Step 2. Put the AC in a constant temperature water bath at 80°C with 40 wt.% HNO 3 The solution (according to 6 mL nitric acid solution / g activated carbon) was impregnated and stirred for 1 h, then washed with deionized water until neutral, and then dried in an oven at 105 °C for 12 h to prepare the sample HAC.

[0037] Step 3. Under the ultrasonic environment at room temperature, prepare the solution according to the equal volume impregnation method, take 2.47g 50 wt.% Mn(NO 3 ) 2 and 0....

Embodiment 2

[0044] Same as Example 1, the difference is that 2.47g 50 wt.% Mn(NO 3 ) 2 , 0.30g Fe(NO 3 ) 3 .9H 2 O and 11.28 g HAC, 5%Mn1%Fe / HAC was prepared, and its denitrification efficiency is shown in Table 1. It can be seen from the table that its denitrification efficiency is lower than 90% between 160-240°C, and the effect ratio is 5 %Mn0.5%Fe / HAC catalyst is poor.

Embodiment 3

[0046] Same as Example 1, the difference is that 3.46g 50 wt.% Mn(NO 3 ) 2 , 0.15g Fe(NO 3 ) 3 .9H 2 O and 11.1 g HAC were prepared to obtain 7%Mn0.5%Fe / HAC. The denitrification efficiency is shown in Table 1. It can be seen from the table that it can maintain more than 90% denitrification efficiency between 140-240°C. The SEM-Mapping characterization diagram of the carbon-based catalyst obtained in this example can be found in image 3 .

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Abstract

The invention discloses a low-sulfur-resistant low-temperature carbon-based denitration catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gasdenitration. The method comprises the steps: pretreating cocoanut active charcoal to obtain a sample AC; impregnating the sample AC in a nitric acid solution, and performing drying to obtain a sampleHAC; preparing a precursor Mn(NO3)2 solution and Fe(NO3)3.9H2O powder into a Mn / Fe-containing precursor mixed solution by adopting an isopyknic impregnation method, putting HAC into the solution, performing magnetic stirring, and performing drying to obtain a sample IAC; and carrying out medium-low temperature segmented calcination on the treated sample IAC to finally obtain the low-sulfur-resistant low-temperature carbon-based denitration catalyst sample. The preparation method is simple in process, low in preparation cost and energy consumption and environmentally friendly, the prepared catalyst has the advantages that the specific surface area of the carbon-based carrier is large, the pore structure is good, oxygen-containing functional groups are rich, and the reduction performance ofthe Mn / Fe active component NOx is excellent, and the low-temperature efficient flue gas denitrification performance of the composite carbon-based catalyst can be achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a low-sulfur-resistant low-temperature carbon-based denitrification catalyst and its preparation method and application. Background technique [0002] NO x It is the main air pollutant, an important precursor of chemical smog, acid rain, and ozone layer destruction, and one of the main pollution sources that cause human respiratory problems and endanger human health. In recent years, national standards have proposed more stringent NO x Emission limit value, that is, the requirement to discharge NO in the flue gas x The concentration is not more than 50 mg / m 3 , therefore, controlling the NO x Emissions are an important part of current air pollution control. [0003] At present, domestic and foreign control combustion flue gas NO x The mainstream emission technology is the SCR denitrification process, which uses V 2 o 5 / TiO 2 , V 2 o 5 -WO 3 / TiO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/8892B01D53/8628B01D2258/0283B01D2251/2062
Inventor 卢平潘磊黄震宋涛徐贵玲陈丹丹
Owner NANJING NORMAL UNIVERSITY
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