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A kind of preparation method and application of manganese-rich mn-sapo-18 molecular sieve catalyst

A technology of mn-sapo-18 and molecular sieve, which is applied in the direction of molecular sieve catalyst, catalyst activation/preparation, separation method, etc., can solve the problems of low preparation yield and narrow catalyst activity temperature range, and achieve wide temperature window and high solid raw material Powder yield, wide hydrothermal stability effect

Active Publication Date: 2022-05-17
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present inventor discloses a manganese-rich Mn-SAPO-34 molecular sieve catalyst and its preparation method and application in CN105964295A. The prepared manganese-rich Mn-SAPO-34 molecular sieve catalyst improves the dispersion of active components , so that the catalyst exhibits excellent low-temperature NH 3 -SCR performance, but the catalyst still has the defects of narrow active temperature range and low preparation yield

Method used

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  • A kind of preparation method and application of manganese-rich mn-sapo-18 molecular sieve catalyst
  • A kind of preparation method and application of manganese-rich mn-sapo-18 molecular sieve catalyst
  • A kind of preparation method and application of manganese-rich mn-sapo-18 molecular sieve catalyst

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Experimental program
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Embodiment 1

[0044] After mixing 12.45g orthophosphoric acid with a certain amount of deionized water, slowly add 8.88g pseudoboehmite, add 12.02g silica sol after mixing evenly, add a certain mass fraction of manganese acetate solution after mixing evenly, fully After stirring, 15.51g of N,N-diisopropylethylamine was added dropwise;

[0045] Put the fully stirred gel into the hydrothermal reactor and crystallize at 180°C for 24 hours, then cool at room temperature, separate the solid crystallized product from the mother liquor, wash until neutral, and dry at 110°C for 12 hours. Then bake in air at 550°C for 6h, with a heating rate of 1°C / min;

[0046] In this method, the amount of each reactant is controlled so that the reaction system has the following mass ratio relationship, that is, the control of Al 2 o 3 ,P 2 o 5 、H 2 O, SiO 2 , manganese acetate, N,N-diisopropylethylamine molar ratio is 1:0.9:68:1:(0.1-0.4):2.0, wherein manganese acetate and Al 2 o 3 The ratio is controlled...

Embodiment 2

[0052] After mixing 12.45g orthophosphoric acid with a certain amount of deionized water, slowly add 8.88g pseudoboehmite, add 12.02g silica sol after mixing evenly, add a certain mass fraction of manganese acetate solution after mixing evenly, fully Add 15.51g template agent dropwise after stirring;

[0053] Put the fully stirred gel into the hydrothermal reactor and crystallize at 180°C for 24 hours, then cool at room temperature, separate the solid crystallized product from the mother liquor, wash until neutral, and dry at 110°C for 12 hours. Then bake in air at 550°C for 6h, with a heating rate of 1°C / min;

[0054] In this method, the amount of each reactant is controlled so that the reaction system has the following mass ratio relationship, that is, the control of Al 2 o 3 ,P 2 o 5 、H 2 O, SiO 2 The molar ratio of manganese acetate and template agent is 1:0.9:68:1:0.2:2.0, wherein the types of template agent are N,N-diisopropylethylamine (DIPEA), diisopropylamine (D...

Embodiment 3

[0057] After mixing 12.45g orthophosphoric acid with a certain amount of deionized water, slowly add 8.88g pseudoboehmite, add 12.02g silica sol after mixing evenly, add a certain mass fraction of manganese acetate solution after mixing evenly, fully After stirring, 15.51g of N,N-diisopropylethylamine was added dropwise;

[0058] Put the fully stirred gel into the hydrothermal reactor and crystallize at 180°C for 12-72 hours, then cool at room temperature, separate the solid crystallized product from the mother liquor, wash until neutral, and dry at 110°C 12h, then roasted in air at 550°C for 6h, the heating rate is 1°C / min;

[0059] In this method, the hydrothermal crystallization time is controlled, that is, the crystallization time is 12 to 72 hours, among which 12 hours, 24 hours, and 48 hours are used.

[0060] image 3 Shown is to screen the hydrothermal crystallization time required for the preparation of molecular sieve catalysts, by image 3 It can be seen that the...

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Abstract

The invention relates to a preparation method and application of a manganese-rich Mn-SAPO-18 molecular sieve catalyst, belonging to the technical field of SCR catalyst preparation. A kind of preparation method of manganese-rich Mn-SAPO-18 molecular sieve catalyst is to use orthophosphoric acid, water, pseudo-boehmite, silica sol and manganese acetate as raw materials after mixing, and then add N,N-diisopropyl ethyl Amines are used as templates, hydrothermally crystallized, and the solid crystalline products are collected and washed to neutrality, and then roasted to obtain them; in this method, the molar ratio of each raw material is: Al 2 o 3 ,P 2 o 5 、H 2 O, SiO 2 , manganese acetate, and N,N-diisopropylethylamine in a molar ratio of 1:(0.8~1):(65~70):(0.2~1.2):(0.05~0.6):(1.0~4.0). The catalyst that above-mentioned preparation method obtains is in NH 3 ‑SCR catalytic reaction application has excellent catalytic activity, wide temperature window and hydrothermal stability.

Description

technical field [0001] The invention belongs to the technical field of SCR catalyst preparation, and in particular relates to a preparation method and application of a manganese-rich Mn-SAPO-18 molecular sieve catalyst. Background technique [0002] Nitrogen oxides (NO x =NO+NO 2 ) mainly comes from stationary sources (such as power plants) and mobile sources (automobiles), and is one of the main air pollutants. According to statistics, 66.7% of the national industrial nitrogen oxide emissions come from the power and heat production and supply industries, which are the largest emitters of nitrogen oxides in my country, among which the thermal power industry has the largest contribution to nitrogen oxides. Areas of focus for oxide emissions. Among many nitrogen oxide pollution control technologies, NH 3 Reduce NO x The Selective Catalytic Reduction (SCR) flue gas denitrification technology of the company is mature and effective, and is widely used in the purification proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J37/08B01J37/10B01D53/86B01D53/56
CPCB01J29/85B01J37/10B01J37/082B01D53/8628B01J2229/183Y02T10/12
Inventor 喻成龙
Owner JIANGXI AGRICULTURAL UNIVERSITY
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