Preparing method and product of hydrophobic sulfur-resistant low-temperature denitration catalyst

A low-temperature denitrification and catalyst technology, which is applied in the field of denitrification catalysts, can solve the problem that the denitrification catalysts of power plants cannot meet the requirements of industrial kiln (boiler) furnace denitrification purification, the decomposition temperature of ammonium sulfate or ammonium bisulfate is not reached, ammonium sulfate or ammonium bisulfate Poisoning inactivation and other problems, to achieve the effect of slowing down the rate of poisoning inactivation, low equipment requirements, and reducing deposition

Inactive Publication Date: 2019-04-19
CHONGQING YUANDA CATALYST MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the flue gas emission temperature of industrial kilns (boilers) is mostly in the range of 170°C to 300°C, while the current mainstream SCR denitrification catalysts in thermal power plants work at temperatures of 305°C to 420°C, power plant denitrification catalysts cannot meet the requirements of industrial kilns (boilers). Furnace denitrification purification requirements
However, the main problem faced by the existing low-temperature denitration catalysts is the poisoning and deactivation of ammonium sulfate or ammonium bisulfate, and the denitration rate drops significantly.
Catalyst deactivation due to ammonium sulfate or ammonium bisulfate poisoning is due to NH in flue gas at low temperature 3 、H 2 O, SO 2 It is easy to form ammonium sulfate or ammonium bisulfate when adsorbed on the surface of the catalyst, but the temperature of the flue gas is too low to reach the decomposition temperature of ammonium sulfate or ammonium bisulfate in the pores of the catalyst (above 300°C). A lot of ammonium sulfate or ammonium bisulfate will accumulate on the surface, so that the denitrification rate of the catalyst will drop sharply, leading to catalyst deactivation

Method used

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  • Preparing method and product of hydrophobic sulfur-resistant low-temperature denitration catalyst
  • Preparing method and product of hydrophobic sulfur-resistant low-temperature denitration catalyst
  • Preparing method and product of hydrophobic sulfur-resistant low-temperature denitration catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of hydrophobic sulfur-resistant low-temperature denitrification catalyst

[0028] (1) Preparation of TiO 2 -SiO 2 Composite carrier

[0029] Add 15L of tetra-n-butyl titanate into a mixture of 4.5L of acetylacetone and 8.82L of absolute ethanol, and stir for 4 hours to obtain solution A;

[0030] Add 2.43L tetraethyl orthosilicate, 26.40g lauryl ammonium sulfate, 66g P127, 65L ethanol and 26.88L ammonia water into 11.65L water, and stir for 4 hours to obtain solution B;

[0031] Add solution B into solution A, mix well to obtain colloid, place the colloid for 2 days, calcinate at 450°C for 4 hours, and cool to room temperature to obtain TiO 2 -SiO 2 Composite carrier, TiO in the composite carrier 2 and SiO 2 The mass ratio is 5:1;

[0032] (2) Preparation of precursor solution

[0033] Add 0.23L of monoethanolammonium, 0.26kg of ammonium metavanadate and 0.61kg of ammonium heptamolybdate into water at 80°C, mix well to prepare the precursor solution;...

Embodiment 2

[0037] Preparation of hydrophobic sulfur-resistant low-temperature denitrification catalyst

[0038] (1) Preparation of TiO 2 -SiO 2 Composite carrier

[0039] Add 14.4L of tetra-n-butyl titanate into a mixture of 4.32L of acetylacetone and 8.47L of absolute ethanol, and stir for 3 hours to obtain solution A;

[0040] Add 2.92L tetraethyl orthosilicate, 32.3g lauryl ammonium sulfate, 78g P127, 25.95L ethanol and 32.2L ammonia water into 14L water, and stir for 3 hours to obtain solution B;

[0041]Add solution B into solution A, mix well to obtain colloid, place the colloid for 1 day, calcinate at 400°C for 5 hours, and cool to room temperature to obtain TiO 2 -SiO 2 Composite carrier, TiO in the composite carrier 2 and SiO 2 The mass ratio is 4:1;

[0042] (2) Preparation of precursor solution

[0043] Add 0.23L of monoethanolammonium, 0.26kg of ammonium metavanadate and 0.61kg of ammonium heptamolybdate into water at 90°C, mix well to prepare the precursor solution; ...

Embodiment 3

[0047] Preparation of hydrophobic sulfur-resistant low-temperature denitrification catalyst

[0048] (1) Preparation of TiO 2 -SiO 2 Composite carrier

[0049] Add 13.5L of tetra-n-butyl titanate into a mixture of 4.05L of acetylacetone and 7.94L of absolute ethanol, and stir for 4 hours to obtain solution A;

[0050] Add 3.65L tetraethyl orthosilicate, 39.63g ammonium lauryl sulfate, 96g P127, 32.44L ethanol and 40.25L ammonia water into 17.50L water, and stir for 4 hours to obtain solution B;

[0051] Add solution B to solution A, mix well to obtain colloid, place the colloid for 3 days, calcinate at 450°C for 4 hours, and cool to room temperature to obtain TiO 2 -SiO 2 Composite carrier, TiO in the composite carrier 2 and SiO 2 The mass ratio is 3:1;

[0052] (2) Preparation of precursor solution

[0053] Add 0.23L of monoethanolammonium, 0.26kg of ammonium metavanadate and 0.61kg of ammonium heptamolybdate into water at 80°C, mix well to prepare the precursor solut...

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Abstract

The invention relates to a preparing method and product of a hydrophobic sulfur-resistant low-temperature denitration catalyst, and belongs to the technical field of denitration catalysts. In the method, by adding a hydrophobic modifier, introducing hydrophobic groups into the catalyst and changing the hydrophobicity of the surface of the catalyst, the vapor in smoke can be less adsorbed to the surface of the catalyst in the use process, and the competitive adsorption between the vapor and NH3 is reduced; in addition, with a TiO2-SiO2 compound as the carrier, the SO2 oxidization rate can be reduced, the deposition of ammonium sulfate salt on the surface of the catalyst or in pores is reduced, the denitration rate of the catalyst can be ensured, and the service life of the catalyst can be prolonged. In addition, a template agent is added in the preparing process, mesopores of the catalyst are increased, the specific surface area and pore volume of the catalyst are improved, the catalystcan contain more ammonium sulfate salt, the toxin inactivation rate of the ammonium sulfate salt is reduced, and the catalyst can be better applied industrially. The catalyst is simple in preparing process, not high in device requirement and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a preparation method and a product of a hydrophobic sulfur-resistant low-temperature denitration catalyst. Background technique [0002] Nitrogen oxides are one of the main pollutants that pollute the atmospheric environment. Thermal power plants, automobile exhaust and industrial kilns (boilers) are the main sources of nitrogen oxide emissions, of which industrial kilns (boilers) account for 38% of the total nitrogen oxide emissions, and thermal power plant flue gas and automobiles The nitrogen oxides in the tail gas have been basically controlled, but the smoke emitted by industrial kilns (boilers) (such as: industrial boilers, glass ceramic furnaces, cement furnaces, iron and steel metallurgical sintering furnaces, cracking equipment in coking and petrochemical systems, etc.) The concentration of nitrogen oxides in the air is higher than the emission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01J23/30B01J2523/00B01J2523/41B01J2523/47B01J2523/55B01J2523/68B01J2523/69
Inventor 周林刘显彬唐清段明华杨欢邓雷段言康张河坤
Owner CHONGQING YUANDA CATALYST MFG
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