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Efficient denitration catalyst and preparation method thereof

A denitrification catalyst and high-efficiency technology, applied in the field of catalysis, can solve the problems of narrow reaction temperature window and poor low-temperature activity, and achieve the effects of uniform dispersion of acid sites, inhibition of sulfation, and improvement of anti-poisoning performance

Active Publication Date: 2018-09-04
ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commercially available V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Although the catalyst is very mature, it still has a narrow reaction temperature window, poor activity at low temperature, and easy formation of N at high temperature. 2 O by-products and main active components V 2 o 5 Biological toxicity and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of Sn-modified MCM-48 molecular sieve carrier:

[0026] The template agent used in the preparation process is CTAB; SnCl 4 As the Sn source, TEOS as the Si source; according to the molar ratio n SiO2 :n SnCl4 :n KOH :n CTAB :n H2O :n 乙醇 =1.0:0.1:0.24:0.1:30:30, weigh a certain amount of TEOS and dissolve it in aqueous ethanol, and mix it with CTAB and SnCl 4 The aqueous solution was mixed and stirred, and potassium hydroxide was added after 30 minutes to continue stirring for 20 minutes, and finally the mixture was packed into a hydrothermal reaction kettle at 150 o C crystallization treatment 36h, take out and cool, then place it in 30%H 2 o 2 Stand in the middle for 12h, then filter with suction, wash until neutral, and then put o C treatment for 12h, finally at 550 o C roasting treatment 5h obtains the MCM-48 molecular sieve carrier of Sn modification;

[0027] 2) Preparation of PO 4 3- -SO 4 2- / Sn-MCM-48

[0028]Weigh 5g of Sn-modifie...

Embodiment 2

[0032] 1) Preparation of Sn-modified MCM-48 molecular sieve carrier:

[0033] The template agent used in the preparation process is CTAB; SnCl 4 As the Sn source, TEOS as the Si source; according to the molar ratio n SiO2 :n SnCl4 :n KOH :n CTAB :n H2O :n 乙醇 =1.0:0.3:0.24:0.2:30:30, weigh a certain amount of TEOS and dissolve it in aqueous ethanol, and mix it with CTAB and SnCl 4 The aqueous solution was mixed and stirred, and potassium hydroxide was added after 30 minutes to continue stirring for 20 minutes, and finally the mixture was put into a hydrothermal reaction kettle at 180 o C crystallization treatment for 24 hours, take it out and cool it, then place it in 30% H 2 o 2 Stand in the middle for 12h, then filter with suction, wash until neutral, and then put o C treatment for 12h, finally at 550 o C roasting treatment 5h obtains the MCM-48 molecular sieve carrier of Sn modification;

[0034] 2) Preparation of PO 4 3- -SO 4 2- / Sn-MCM-48

[0035] Weigh 5g...

Embodiment 3

[0039] 1) Preparation of Sn-modified MCM-48 molecular sieve carrier:

[0040] The template agent used in the preparation process is CTAB; SnCl 4 As the Sn source, TEOS as the Si source; according to the molar ratio n SiO2 :n SnCl4 :n KOH :n CTAB :n H2O :n 乙醇 =1.0:0.2:0.24:0.15:30:30, weigh a certain amount of TEOS and dissolve it in aqueous ethanol, and mix it with CTAB and SnCl 4 The aqueous solution was mixed and stirred, and potassium hydroxide was added after 30 minutes to continue stirring for 20 minutes, and finally the mixture was put into a hydrothermal reaction kettle at 165 o C crystallization treatment 30h, take out and cool, then place it in 30%H 2 o 2 Stand in the middle for 12h, then filter with suction, wash until neutral, and then put o C treatment for 12h, finally at 550 o C roasting treatment 5h obtains the MCM-48 molecular sieve carrier of Sn modification;

[0041] 2) Preparation of PO 4 3- -SO 4 2- / Sn-MCM-48

[0042] Weigh 5g of Sn-modified...

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PUM

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Abstract

The invention discloses an efficient denitration catalyst and a preparation method thereof. A hydrothermal method and a sol impregnation method are adopted for combined treatment; an Sn-containing MCM-48 molecular sieve in a skeleton serves as a carrier; the Sn-containing MCM-48 molecular sieve is subjected to SO4<2-> and PO4<3-> modification by a mixed solution which is obtained by mixing deionized water, sulfuric acid with the mass concentration of 98 percent and phosphoric acid with the mass concentration of 85 percent by weight, thereby obtaining the novel denitration catalyst taking Fe asan active component. The denitration catalyst prepared with the preparation method has relatively high specific surface area, and can have high catalytic activity and SO2 poisoning resistance withinthe range of 200 to 450 DEG C.

Description

technical field [0001] The technical field of catalysis of the present invention relates to a denitration catalyst, in particular to a high-efficiency denitration catalyst and a preparation method thereof. Background technique [0002] In recent years, with the continuous advancement of my country's industrialization and urbanization process, the use of fossil energy and resource consumption have continued to increase, the situation of air pollution has further deteriorated, regional air pollution continues to intensify, and the emission of multiple pollutants ranks among the top in the world. Among many pollutants, nitrogen oxides (NO x ) is one of the typical air pollutants in my country, and a large amount of NO is emitted into the atmosphere x It will lead to a series of air pollution problems, such as acid rain formed by gas phase reaction, greenhouse effect caused by hydrocarbons, photochemical smog and smog caused by light; at the same time, it also endangers human h...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J33/00B01J37/02B01J37/10B01D53/86B01D53/56
CPCB01D53/8628B01J29/0333B01J33/00B01J37/0201B01J37/10B01D2255/50B01D2255/2094B01J2229/18B01J2229/183B01J35/396
Inventor 李俊霞
Owner ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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