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Low temperature denitration catalyst for anti-SO2 and H2O poisoning and preparation method of same

A low-temperature denitrification and catalyst technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as narrow temperature range and application limitations, and achieve improved dispersion, promotion of adsorption and activation, and enhanced surface Acid effect

Active Publication Date: 2015-10-28
COAL IND JINAN DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned catalysts have a narrow temperature range when the denitration rate is greater than 90%, which limits their application.

Method used

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  • Low temperature denitration catalyst for anti-SO2 and H2O poisoning and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1)Al 2 o 3 Sol preparation

[0034] Take 25 grams of pseudo-boehmite and add it to 200 g of deionized water, and add 10 g of concentrated nitric acid dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until complete peptization, control the pH value of the solution at 3, and age for 24 hours to obtain a transparent aluminum sol.

[0035] (2) TiO 2 - Preparation of molecular sieve composite slurry

[0036] 26 g TiO 2 , 15 grams of molecular sieve and 3 grams of urea are mixed evenly, and 10 grams of Al 2 o 3 Sol, 200 grams of deionized water, and a concentration of 0.5mol L -1 Adjust the pH to 2 with nitric acid solution, stir vigorously for 2 hours, and age at room temperature for 12 hours to obtain TiO 2 - Composite slurry of molecular sieves.

[0037] (3) TiO 2 - Preparation of molecular sieve composite coating

[0038] Immerse the cordierite honeycomb carrier into the TiO prepared in step (3) 2 - ...

Embodiment 2

[0043] (1)Al 2 o 3 Sol preparation

[0044] Get 60 grams of pseudo-boehmite and add it to 200 g of deionized water, and add 16 g of concentrated nitric acid dropwise while stirring. After stirring for a certain period of time, heat to 60°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 5, and age for 24 hours to obtain a transparent aluminum sol.

[0045] (2) TiO 2 - Preparation of molecular sieve composite slurry

[0046] 56 g TiO 2 , 20 grams of molecular sieve and 8 grams of urea are mixed evenly, and 15 grams of Al 2 o 3 Sol, 200 grams of deionized water, and a concentration of 0.5mol L -1 Adjust the pH to 4, stir vigorously for 2 hours, and age at room temperature for 12 hours to obtain TiO 2 - Composite slurry of molecular sieves.

[0047] (3) TiO 2 - Preparation of molecular sieve composite coating

[0048] Immerse the cordierite honeycomb carrier into the TiO prepared in step (3) 2 - In the molecular sieve compo...

Embodiment 3

[0053] (1)Al 2 o 3 Sol preparation

[0054] Take 40 grams of pseudo-boehmite and add it to 200 grams of deionized water, and add 20 grams of concentrated nitric acid dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until complete peptization, control the pH value of the solution at 4, and age for 24 hours to obtain a transparent aluminum sol.

[0055] (2) TiO 2 - Preparation of molecular sieve composite slurry

[0056] 35 g TiO 2 , 20 grams of molecular sieve and 4 grams of urea are mixed evenly, and 12 grams of Al 2 o 3 Sol, 200 grams of deionized water, and a concentration of 0.5mol L -1 Adjust the pH to 4 with nitric acid solution, stir vigorously for 2 hours, and age at room temperature for 12 hours to obtain TiO 2 - Composite slurry of molecular sieves.

[0057] (3) TiO 2 - Preparation of molecular sieve composite coating

[0058] will be coated with Al 2 o 3 The coated carrier is immersed in the TiO...

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Abstract

The present invention relates to the technical field of low temperature denitration catalysts, and in particular discloses a low temperature denitration catalyst for anti SO2 and H2O poisoning and a preparation method of the same. According to the preparation method of the low temperature denitration catalyst for anti-SO2 and H2O poisoning, a horeycomb ceramic matrix is chosen, and firstly a TiO2-molecular sieve is dipped, the TiO2-molecular sieve coating is coated by composite sol, and finally loaded active components Mn, Fe, Ce, and Sn are dipped. Furthermore, a certain amount of SO42- can be doped into the dipped active components, and a carrier can be loaded with the SO42-. The preparation method is simple in operation and low in costs, and the prepared catalyst is high in low-temperature activity and wide in high-activity temperature window, and can maintain a good nitrogen oxide removal rate and water and sulfur tolerance at 120-300 DEG C, and is suitable to be used behind a precipitator of a thermal power plant and in the field in which flue gas temperature is 120-300 DEG C, such as an industrial kiln.

Description

(1) Technical field [0001] The invention relates to the technical field of low-temperature denitrification catalysts, in particular to an anti-SO 2 and H 2 O-poisoned low-temperature denitrification catalyst and preparation method thereof. (2) Background technology [0002] During the "Twelfth Five-Year Plan" period, the country's control over nitrogen oxide emissions has become more and more stringent, and the pure low-nitrogen combustion technology has been unable to meet the current emission standards. At present, the most effective control measure for stationary source NOx is to use NH 3 The selective catalytic reduction technology (SCR) is the reducing agent, and the catalyst is the core of the technology. At present, the large-scale application of SCR catalysts is based on V 2 o 5 As an active component, TiO 2 As a carrier, add WO 3 or MoO 3 As a co-catalyst, the medium-high temperature catalyst has high activity only when the temperature is higher than 300...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J35/04B01D53/90B01D53/56
Inventor 宋磊
Owner COAL IND JINAN DESIGN & RES
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