Low temperature wide-active temperature window SCR denitration catalyst and preparation method thereof

An active temperature window, denitration catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of high catalyst cost, increased denitration cost, catalyst deactivation and wear The problem is that the preparation method is simple and easy to operate, the resource utilization rate is improved, and the denitration activity is good.

Inactive Publication Date: 2016-08-31
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of catalyst is expensive, the temperature window is narrow (300°C-400°C), and the optimal reaction temperature is about 350°C. The higher operating temperature makes the SCR denitrification device generally placed before the dust removal and desulfurization device, so the catalyst is easily deactivated and wear, reduced life
When the denitrification device is placed after the dust removal and desulfurization device, it is necessary to install a flue gas preheating device to meet the requirements of catalytic activity, which will greatly increase the cost of denitrification, increase system energy consumption and operating costs

Method used

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  • Low temperature wide-active temperature window SCR denitration catalyst and preparation method thereof
  • Low temperature wide-active temperature window SCR denitration catalyst and preparation method thereof
  • Low temperature wide-active temperature window SCR denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The present embodiment provides a method for preparing an SCR denitration catalyst with a low temperature and wide active temperature window. The preparation method includes the following steps:

[0028] (1) Add 20 g of purified attapulgite into 100 mL of distilled water, add 20 mL of manganese nitrate solution with a mass fraction of 50% and a certain amount of cerium nitrate hexahydrate and copper nitrate trihydrate in turn, and continue stirring for 1 h to obtain a catalyst suspension. liquid;

[0029] Attapulgite was purchased from Xuyi Meirui Attapulgite Processing Co., Ltd. (our products are refined through the processes of beneficiation, purification, drying, activation, grinding, etc.; brand: Meirui attapulgite Rongxi brand, item number: 00006, color classification: light grey);

[0030] (2) let the catalyst suspension stand for 4h;

[0031] (3) drying the obtained in step (2) at 80°C for 12h;

[0032] (4) The dried precipitate was placed in a muffle furnace,...

Embodiment 2

[0038] Add 20 g of purified attapulgite into 100 mL of distilled water, and then add 20 mL of manganese nitrate solution with a mass fraction of 50%, 2.15×10 -3 mol cerium nitrate hexahydrate, the molar ratio of cerium to copper between cerium nitrate hexahydrate and copper nitrate trihydrate is 1:40, keep stirring for 1h, then stand for 4h, dry at 80℃ for 12h, and then roast at 500℃ in air atmosphere 5h; finally grind and sieve, and take the part of 40-60 mesh as catalyst.

[0039] The catalyst was evaluated for SCR catalytic activity in a specified temperature window (120°C-300°C). The catalyst evaluation conditions are: the catalyst dosage is about 1.6g, the flue gas concentration is 500 ppm NO, 500 ppm NH 3 , 5% O 2 , N 2 It is an equilibrium gas, the total gas flow is 305 mL / min, and the reaction space velocity is 10000 h -1 . like figure 1 As shown, under the temperature conditions of 120 °C - 300 °C, the denitration rate of the catalyst can reach more than 88%. ...

Embodiment 3

[0041] Add 20 g of purified attapulgite into 100 mL of distilled water, and then add 20 mL of manganese nitrate solution with a mass fraction of 50%, 2.15×10 -3 mol cerium nitrate hexahydrate, the molar ratio of cerium and copper between cerium nitrate hexahydrate and copper nitrate trihydrate is 1:20, stirring continuously for 1h, then standing for 4h, drying at 80℃ for 12h, and then calcining at 500℃ in air atmosphere 5h; finally grind and sieve, and take the part of 40-60 mesh as catalyst.

[0042] The catalyst was evaluated for SCR catalytic activity in a specified temperature window (120°C-300°C). The catalyst evaluation conditions are: catalyst dosage is 1.6g, flue gas concentration is 500 ppm NO, 500 ppm NH 3 , 5% O 2 , N 2 It is an equilibrium gas, the total gas flow is 305 mL / min, and the reaction space velocity is 10000 h -1 . like figure 2 As shown, at the reaction temperature of 120 °C, the denitration rate of the catalyst reached more than 92%, and at the r...

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Abstract

The invention relates to a low temperature wide-active temperature window SCR denitration catalyst. The catalyst comprises a carrier and an active component, wherein the carrier is attapulgite, and the active component is a composition comprising manganese-containing oxide, cerium-containing oxide and copper-containing oxide. The use amount of attapulgite meets a ratio of metal elements to attapulgite of 0.03-0.06mol/20g, the mole percentage of the manganese element in the active component is 50-80%, and a molar ratio of the cerium element to the copper element is 1:10 ~ 1:40. The invention also relates to a preparation method of the catalyst. The preparation method comprises the following steps: adding 20g of purified attapulgite to 100mL of distilled water, sequentially adding 20mL of a manganese nitrate solution with the mass fraction of 50% and certain amounts of cerium nitrate hexahydrate and copper nitrate trihydrate, continuously stirring above added materials for 1h, standing the obtained solution for 4h, drying the obtained material at 80DEG C for 12h, and roasting the dried material in air atmosphere at 500DEG C for 5h; and grinding the roasted material, and sieving the ground material to obtain a 40-60 mesh material used as the catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an SCR denitration catalyst with a low temperature and wide active temperature window and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main harmful substances that pollute the atmosphere, and it is also a major factor that directly leads to hazy days, ozone destruction, and air pollution in various parts of our country. Atmospheric NO x Mainly from thermal power generation, followed by industry and transportation sectors. Therefore, coal-fired power plants NO x Emission reduction has become a hot spot in air pollution control. in various NO x Among emission reduction technologies, selective catalytic reduction (SCR) technology is the most widely used. It uses ammonia water or urea as a reducing agent, and under the action of a denitrification catalyst, NO x Reduced to nitrogen and water. [0003] The core of SCR technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/8892B01D53/8628B01D2258/0283B01J23/002B01J2523/00B01J2523/17B01J2523/3712B01J2523/72
Inventor 徐东耀马妍左海清但海均白艳英林爽刘伟刘向辉董彬彬陈家琪
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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