Low-temperature denitration catalyst and preparation method thereof

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 the problems of application limitations and insufficient denitrification activity, and achieve increased sulfur resistance, good low-temperature denitrification activity and anti-oxidation Anti-sulfur performance of water, promote the effect of high-efficiency

Inactive Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalysts mentioned above contain SO 2 In the case of water and water, the denitrification activity is not high enough, and the low temperature range where the denitrification rate is greater than 90% is narrow, which limits its application to a certain extent.

Method used

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  • Low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1)Al 2 o 3 Sol preparation

[0033] 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.

[0034] (2)Al 2 o 3 Coating Preparation

[0035] Immerse the cordierite honeycomb ceramic matrix into the prepared Al 2 o 3 In the sol, take it out after immersing for 5 minutes, blow off the residual liquid, dry at 120°C for 6 hours, and bake at 500°C for 5 hours to obtain Al-coated 2 o 3 Coated carrier.

[0036] (3) TiO 2 - Preparation of molecular sieve composite slurry

[0037] 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 ...

Embodiment 2

[0044] (1)Al 2 o 3 Sol preparation

[0045] 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.

[0046] (2)Al 2 o 3 Coating Preparation

[0047] Immerse the cordierite honeycomb ceramic matrix into the prepared Al 2 o 3 In the sol, take it out after immersing for 4 minutes, blow off the residual liquid, dry at 120°C for 6 hours, and bake at 500°C for 5 hours to obtain Al-coated 2 o 3 Coated carrier.

[0048] (3) TiO 2 - Preparation of molecular sieve composite slurry

[0049] 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, s...

Embodiment 3

[0056] (1)Al 2 o 3 Sol preparation

[0057] 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.

[0058] (2)Al 2 o 3 Coating preparation

[0059] Immerse the cordierite honeycomb ceramic matrix into the prepared Al 2 o 3In the sol, take it out after immersing for 3 minutes, blow off the residual liquid, dry at 120°C for 6 hours, and bake at 500°C for 5 hours to obtain Al-coated 2 o 3 Coated carrier.

[0060] (3) TiO 2 - Preparation of molecular sieve composite slurry

[0061] 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 p...

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Abstract

The invention discloses a low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: by taking honeycombed ceramic as a substrate, firstly, coating the substrate with an Al2O3 coating in a soaking manner, secondly, coating the substrate with a TiO2-molecular sieve coating in the soaking manner, and finally loading active components of Mn, Cu, Ce and Sn in the soaking manner. According to the low-temperature denitration catalyst disclosed by the invention, based on the honeycombed ceramic substrate, the percentage of the Al2O3 coating is 1-10wt%, the percentage of the TiO2-molecular sieve coating is 1-10wt%, and the mass ratio of TiO2 to a molecular sieve ranges from (10:1) to (1:1); the percentage of the active component Mn is 1-10wt%, the percentage of Cu is 0.5-5wt%, the percentage of Sn is 0.1-1wt%, and the percentage of Ce is 1-10wt%. The preparation method disclosed by the invention is simple in preparation process, and the prepared catalyst contains fume of SO2 and H2O of high concentration, and is good in low-temperature denitration activity.

Description

technical field [0001] The invention relates to a low-temperature denitrification catalyst and a preparation method thereof, in particular to an anti-SO 2 and H 2 O-poisoned low-temperature denitrification catalyst and preparation method thereof. Background technique [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°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/00
Inventor 王宽岭王学海刘淑鹤陈高升刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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