Preparation method and application of manganese-rich Mn-SAPO-18 molecular sieve catalyst

A mn-sapo-18, molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, separation methods, etc., can solve the problems of narrow catalyst activity temperature range, low preparation yield, etc., and achieve high solid raw powder yield, Wide temperature window and excellent SCR activity

Active Publication Date: 2021-08-31
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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  • Preparation method and application of manganese-rich Mn-SAPO-18 molecular sieve catalyst
  • Preparation method and application of manganese-rich Mn-SAPO-18 molecular sieve catalyst
  • 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 crystalline 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 (DI...

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, and then roasted in air at 550°C for 6h, with a heating rate of 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 t...

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Abstract

The invention relates to a preparation method and application of a manganese-rich Mn-SAPO-18 molecular sieve catalyst, and belongs to the technical field of SCR catalyst preparation. The preparation method of the manganese-rich Mn-SAPO-18 molecular sieve catalyst comprises the following steps: mixing orthophosphoric acid, water, pseudo-boehmite, silica sol and manganese acetate as raw materials, adding N,N-diisopropylethylamine as a template agent, carrying out hydrothermal crystallization, collecting a solid crystallization product, conducting washing to a neutral state, and conducting roasting to obtain the manganese-rich Mn-SAPO-18 molecular sieve catalyst. In the method, the molar ratio of the raw materials, namely Al2O3, P2O5, H2O, SiO2, manganese acetate and N,N-diisopropylethylamine, is 1:(0.8-1):(65-70):(0.2-1.2):(0.05-0.6):(1.0-4.0). The catalyst obtained by the preparation method has excellent catalytic activity, wider temperature window and hydrothermal stability when being applied to NH3-SCR catalytic reaction.

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 Applications(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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