Process for preparing SCR denitration catalyst and SCR denitration catalyst prepared by the method

A denitrification catalyst, a certain amount of technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the catalyst does not have resistance to sulfur dioxide oxidation

Inactive Publication Date: 2009-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, catalysts obtained from iron nitrate and chloride do not have the ability to simultaneously resist arsenic poisoning and sulfur dioxide oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 10 grams of ferrous ammonium sulfate in 100 grams of water, add 50 grams of nano TiO under stirring 2 After stirring evenly, add 50 grams of A-type molecular sieve, stir until dry under heating, and dry at 100° C. for 5 hours. Then at 200°C, calcine with oxygen for 1 hour, and then calcined at 400°C for 10 hours under nitrogen to obtain the required catalyst. The denitrification efficiency is 91%, the sulfur dioxide oxidation rate is <1%, and the denitrification rate remains at the original 99% after 300 hours. %, sulfur dioxide oxidation rate <1%.

Embodiment 2

[0023] Dissolve 10 grams of ferrous ammonium sulfate in 100 grams of water, add 50 grams of nano TiO under stirring 2 , and then add 50 grams of X-type molecular sieves, stir until dry under heating, and dry at 100° C. for 5 hours. Then at 300°C, calcine with oxygen for 2 hours, and then calcined at 450°C for 5 hours under nitrogen to obtain the required catalyst. The denitrification efficiency is 92%, the sulfur dioxide oxidation rate is <1%, and the denitration rate remains at the original 98% after 300 hours. %, sulfur dioxide oxidation rate <1%.

Embodiment 3

[0025] Dissolve 8 grams of ferrous ammonium sulfate in 100 grams of water, add 70 grams of nano TiO under stirring 2 , and then add 30 grams of X-type molecular sieves, stir until dry under heating, and dry at 100° C. for 5 hours. Then at 350°C, calcine with oxygen for 3 hours, and then calcined at 350°C for 5 hours under nitrogen to obtain the required catalyst. The denitrification efficiency is 90%, the sulfur dioxide oxidation rate is <1%, and the denitrification rate remains at the original 96% after 300 hours. %, sulfur dioxide oxidation rate <1%.

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Abstract

The invention relates to a method for preparing an SCR deNOx catalyst. The method comprises: 1. dissolving a certain amount of ferrous sulfate in water; 2. adding anatase type nanometer TiO2, wherein the mass ratio of ferrous sulfate to the TiO2 is 1: (2-30); 3. adding a silicate nanoporous material, wherein the mass ratio of the silicate nanometer material to the TiO2 is 1 : (0.5-2) to stir evenly; 4. heating and stirring the obtained solution until the solution is dried, and drying the solution for 1 to 10 hours at a temperature of between 60 and 160 DEG C; and 5. burning the dried solution in the step 4 by oxygen for 0.5 to 5 hours at a temperature of between 200 and 350 DEG C, and calcining the dried solution in the presence of nitrogen at a temperature of between 350 and 450 DEG C for 4 to 48 hours to obtain the catalyst. Furthermore, the invention also relates to the SCR deNOx catalyst prepared by the method for preparing the SCR deNOx catalyst. The catalyst has arsenic poisoning resistance and sulfur oxidizing resistance, can be formed through various processes, and is applicable to electrical power and related enterprises in flue gas selective catalytic denitration and other energy environment-friendly industrial fields.

Description

technical field [0001] The invention relates to a preparation method of an SCR denitration catalyst and an SCR denitration catalyst prepared by the method. Background technique [0002] Nitrogen oxides (NOx) are one of the harmful substances in the exhaust gases of boilers and internal combustion engines. NOx has many hazards to environmental problems and human health. It is toxic to the human body. It is the main pollutant that forms acid rain and acid fog. It forms photochemical smog with hydrocarbons, which can destroy the ozone layer. It is also one of the greenhouse gases. Facing the severe environmental protection situation, in 2003, my country promulgated the new "Emission Standards of Air Pollutants for Thermal Power Plants", and the highest concentration of NOx emissions allowed by the state (standard state) is 450mg / m 3 (Vdaf>20%), and since July 2004, NOx sewage charges have been levied, the standard is 0.63 yuan / kg. Due to the limitations of the low-nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/064B01D53/56
Inventor 孙克宁尹肖菊邵延斌
Owner HARBIN INST OF TECH
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