Foam-like low-temperature SCR catalyst and preparation method thereof

An SCR catalyst and foam-like technology, which is applied in the field of foam-like low-temperature SCR catalyst and its preparation, can solve the problems of difficult mixing of flue gas and reducing agent, lower utilization rate of catalyst and low utilization rate of reducing agent, etc. Effects of denitration efficiency, good thermal stability and anti-sulfur and water resistance, excellent low temperature activity and denitration efficiency

Active Publication Date: 2016-02-03
展宗城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SCR catalysts published in patents CN1777477, CN103464194 and CN1457920 are all honeycomb-shaped, and the flue gas moves along a straight line in the channel, so it is difficult to fully mix the...

Method used

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  • Foam-like low-temperature SCR catalyst and preparation method thereof
  • Foam-like low-temperature SCR catalyst and preparation method thereof
  • Foam-like low-temperature SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of active coating powder:

Embodiment 1-1

[0038] Add 7.5Kg of deionized water to the reaction kettle and heat it to 50°C, add 1.35Kg of oxalic acid and stir until dissolved, slowly add 0.24Kg of ammonium metavanadate, add 0.45Kg of ammonium heptamolybdate after 1-10min, and add 0.45Kg of ammonium heptamolybdate after stirring for 20min and 0.08Kg manganese nitrate, stirring for 1.5h, adding 0.03Kg ammonium sulfate, stirring for 30min, to obtain an impregnation solution of active components.

[0039] Add 6Kg TiO to the active ingredient impregnation solution 2 The powder was stirred to a slurry state, and ultrasonically dispersed for 1.5 hours under stirring conditions to obtain a low-temperature SCR catalyst slurry; the low-temperature SCR catalyst slurry was dried at 250 °C for 3.0 hours, then crushed, and then calcined at 450 °C in an air flow for 3.5 hours. , pulverized to 300 mesh to obtain active coating powder 1-1, where V 2 O 5 , MoO 3 , MnO 2 and SO 2 The loadings relative to the substrate were 3%, 6%, 0....

Embodiment 1-2

[0041] Compared with Example 1-1: the mass of oxalic acid was changed from 1.35Kg to 0.9Kg, the mass of ammonium metavanadate was changed from 0.24Kg to 0.16Kg, and the rest of the process was the same as that of Example 1-1, to obtain active coating powder 1-2 , where V 2 O 5 , MoO 3 , MnO 2 and SO 2 The loadings relative to the substrate were 2%, 6%, 0.5% and 0.25%, respectively.

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PUM

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Abstract

The invention relates to a foam-like low-temperature SCR catalyst and a preparation method thereof. The catalyst is composed of a framework carrier and an active coating carried by the framework carrier. Foam ceramic of a 3D porous structure serves as the framework carrier. The active coating is composed of active components, auxiliaries and base materials. The inner portion of the foam-like low-temperature SCR catalyst is of a staggered 3D porous structure, smoke moves in ducts in a curve mode, the mixing effect of smoke and reducing agents is optimized, the utilization rate of reducing agents is increased, and ammonia escape is reduced. The catalyst has excellent low-temperature activity for NOx reduction, the removal efficiency for NOx under the condition that the smoke temperature is 170-180 DEG C is kept at 90% or above, and the catalyst has high thermal stability and sulfur-resistant capacity.

Description

technical field [0001] The invention relates to a foamy low-temperature SCR catalyst and a preparation method thereof, belonging to the fields of air pollution control and environmental catalytic materials. Background technique [0002] Nitrogen oxides (NOx) discharged into the atmosphere include NO, NO 2 , N 2 O, etc., mainly from coal-fired power stations, motor vehicle exhaust, and industrial boilers, process, and chemical industries in non-power industries. The huge discharge of NOx has seriously threatened people's life and health, and affected the sustainable development of the national economy. The type of acid rain in my country is changing from sulfuric acid to sulfuric acid-nitric acid compound, which will cause greater damage. In addition, NOx is also highly toxic, which can participate in photochemical reactions and destroy the ozone layer, while forming secondary pollutants with higher toxicity and longer duration. Therefore, NOx emission reduction and total ...

Claims

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Application Information

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IPC IPC(8): B01J27/224B01J27/051B01J35/10B01D53/86B01D53/56
Inventor 展宗城杨艳林展宗刚贾海建杨峰
Owner 展宗城
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