Low-temperature SCR denitration catalyst and preparation method thereof

A technology for denitration catalyst and waste catalyst, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high preparation cost, inability to fully utilize solid waste resources, and poor low-temperature denitration efficiency, and achieve large The effect of specific surface area, high-value recycling, and excellent denitration performance

Inactive Publication Date: 2021-07-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a low-temperature SCR denitrification catalyst and its preparation method for the problems of poor low-temperature denitrification efficiency, high preparation cost and inability to fully utilize solid waste resources of existing SCR denitrification catalysts

Method used

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  • Low-temperature SCR denitration catalyst and preparation method thereof
  • Low-temperature SCR denitration catalyst and preparation method thereof
  • Low-temperature SCR denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The modified biochar and the spent FCC catalyst were weighed at a ratio of 2:1, and the catalyst carrier was prepared after mechanical blending. The modified biochar was ultrasonically impregnated with a phosphoric acid solution with a concentration of 70 wt% for 1 hour, and then dried at 105°C for 24 hours. Prepared by pyrolysis at 600°C for one hour. Using manganese nitrate as the Mn source, the Mn element load is 15%, add deionized water to prepare the manganese nitrate solution, impregnate the weighed modified biochar and FCC waste catalyst in the manganese nitrate solution, stir evenly with a glass rod and ultrasonically impregnate After 2 hours of treatment, take it out and dry it at 105°C for 12 hours. The dried sample was calcined at 500°C for 2 hours in a nitrogen atmosphere, and after the furnace temperature was cooled, it was taken out and ground to 40-60 meshes to obtain the MnOx / (SFCC+PCB) SCR catalyst of this example. The SEM, EDS and FTIR images were resp...

Embodiment 2

[0066] The preparation method is the same as that of Example 1, the difference is that in this example, the loading of Mn element is 10wt%, and the obtained catalyst is placed in figure 1 The flue gas denitrification performance test is carried out in the fixed bed flow reaction device shown, and the simulated flue gas is composed of NO, NH 3 , O 2 , N 2 Composition of four gases, of which NO is 400ppm, NH 3 400ppm, O 2 The volume fraction is 5%, N 2 As a balance gas, the space velocity ratio is 5800h -1 , the experimental temperature range is 100℃~280℃, the experimental results are as follows Figure 4 shown. It can be seen from the figure that the denitrification efficiency of the catalyst obtained in this example is lower than that of Example 1 in the temperature range of 100°C to 160°C, and higher than that of Example 1 in the temperature range of 160°C to 280°C, because With the reduction of Mn loading, the content of MnOx on the surface of the catalyst also decrea...

Embodiment 3

[0068] The preparation method is the same as that of Example 1, the difference is that in this example, the loading of Mn element is 5wt%, and the obtained catalyst is placed in figure 1 The flue gas denitrification performance test is carried out in the fixed bed flow reaction device shown, and the simulated flue gas is composed of NO, NH 3 , O 2 , N 2 Composition of four gases, of which NO is 400ppm, NH 3 400ppm, O 2 The volume fraction is 5%, N 2 As a balance gas, the space velocity ratio is 5800h -1 , the experimental temperature range is 100℃~280℃, the experimental results are as follows Figure 4 As shown, it can be seen from the figure that the denitration efficiency of the catalyst obtained in this example is lower than that of Example 2 between 100°C and 280°C, and the further reduction of MnOx content on the catalyst surface leads to too few active sites, which limits the denitration efficiency.

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Abstract

The invention discloses a low-temperature SCR denitration catalyst and a preparation method thereof, and belongs to the technical field of low-temperature SCR denitration. According to the method, an FCC waste catalyst and modified biochar are used as supporting carriers, transition metal oxides are used as active components, the loading amount of transition metal elements in the components is 5-20% of the weight of the carriers, the active components are loaded on the carriers by adopting an impregnation method, then drying treatment is performed, and finally roasting is performed in a nitrogen atmosphere, and the low-temperature SCR denitration catalyst disclosed by the invention is obtained. The problems of low low-temperature denitration activity and high cost of a vanadium-titanium catalyst are solved, resource comprehensive utilization of the FCC waste catalyst is achieved, damage of industrial solid waste to the environment is reduced, and the prepared SCR catalyst has excellent denitration performance under the low-temperature condition and has good application prospects and market prospects for low-temperature denitration of industrial flue gas.

Description

technical field [0001] The invention belongs to the technical fields of air pollution control technology, solid waste resource recycling and low-temperature SCR catalyst preparation, and in particular relates to a low-temperature SCR denitrification catalyst and a preparation method thereof. Background technique [0002] NOx is a major air pollutant, and it is also the focus and difficulty of air pollutant control. Its emissions have remained high in recent years. A large amount of NOx emissions lead to frequent natural disasters such as smog, acid rain, and photochemical smog, which have a serious impact on people's daily life and life safety. Therefore, it is imperative to strengthen the control of NOx. Selective catalytic reduction technology (SCR) is the most widely used due to its mature technology, high denitrification efficiency and good economy. The core of this technology lies in the SCR catalyst. The performance of the catalyst is the key to determine the denitrifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/8892B01D53/8628
Inventor 邱冰冰陶雪东楚化强李文科
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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