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Preparation method and application of catalyst containing low-silicon composite metal Beta molecular sieve

A composite metal and molecular sieve technology, which is applied in the field of denitrification catalysts, can solve the problems of narrow high activity temperature range, achieve low cost, good denitrification effect, and improve denitrification performance

Active Publication Date: 2020-09-04
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a preparation method and application of a catalyst containing a low-silicon composite metal Beta molecular sieve, which solves the technical problem of ensuring the hydrothermal aging stability of the Beta molecular sieve catalyst and at the same time the narrow range of SCR high activity temperature

Method used

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  • Preparation method and application of catalyst containing low-silicon composite metal Beta molecular sieve
  • Preparation method and application of catalyst containing low-silicon composite metal Beta molecular sieve
  • Preparation method and application of catalyst containing low-silicon composite metal Beta molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0034] S1, adding the roasted Beta molecular sieve to the prepared 10% sodium hydroxide solution, the liquid-solid mass ratio of the sodium hydroxide solution to the Beta molecular sieve is 30:1, after stirring and mixing, under the airtight condition of 100°C, Process 5h, the suspension liquid product that obtains is structure directing agent;

[0035] S2. Dissolve aluminum isopropoxide and sodium hydroxide in deionized water and stir evenly, then add silicon dioxide and stir well to form a silica-alumina gel, add ferrocene to the silica-alumina gel and stir After a certain period of time, a structure-directing agent of 5% of the total mass of the silica-alumina gel is added to obtain a mixed gel; the molar composition of the above-mentioned synthetic raw materials is silicon dioxide: aluminum isopropoxide: sodium hydroxide: ferrocene: H 2 O=12:1:5:0.2:150; after aging the mixed gel prepared above at 100°C for 2h, put it into a high-pressure reactor, raise the temperature to ...

Embodiment 2

[0040] S1, adding the roasted Beta molecular sieve to the prepared 10% sodium hydroxide solution, the liquid-solid mass ratio of the sodium hydroxide solution to the Beta molecular sieve is 20:1, after stirring and mixing, under the airtight condition of 100°C, Process 5h, the suspension liquid product that obtains is structure directing agent;

[0041] S2. Dissolve sodium metaaluminate and sodium hydroxide in deionized water and stir evenly, then add silica sol and stir well to form a silica-alumina gel, add ferrocene to the silica-alumina gel and stir for a while time, then add a structure-directing agent of 5% of the total mass of the silica-alumina gel dry basis to obtain a mixed gel; the molar composition of the above-mentioned synthetic raw materials is silica sol: sodium metaaluminate: sodium hydroxide: ferrous sulfate: H 2 O=20:1:6:0.3:180; after aging the mixed gel prepared above at 100°C for 2h, put it into a high-pressure reactor, raise the temperature to 160°C for ...

Embodiment 3

[0046] S1. Add the roasted Beta molecular sieve to the prepared 10% sodium hydroxide solution. The liquid-solid mass ratio of the sodium hydroxide solution to the Beta molecular sieve is 25:1. After stirring and mixing, under the airtight condition of 100°C, Process 5h, the suspension liquid product that obtains is structure directing agent;

[0047] S2. Dissolve pseudoboehmite and sodium hydroxide in deionized water and stir evenly, then add white carbon black and stir well to form a silica-alumina gel, add ferric nitrate to the silica-alumina gel and stir After a certain period of time, a structure-directing agent of 5% of the total mass of the silica-alumina gel is added to obtain a mixed gel; the molar composition of the above-mentioned synthetic raw materials is white carbon black: pseudoboehmite: sodium hydroxide: iron nitrate: H 2 O=25:1:15:0.5:180; after aging the mixed gel prepared above at 100°C for 2h, put it into a high-pressure reactor, raise the temperature to 16...

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Abstract

The invention discloses a preparation method and application of a catalyst containing a low-silicon composite metal Beta molecular sieve. The Fe-Beta molecular sieves with different morphologies are prepared by a one-step method by controlling the composition of synthesis raw materials and a structure-directing agent under the condition of no template agent, so that the acidity and pore channels of the molecular sieves are optimized, and the purpose of optimizing the performance of the molecular sieves is achieved. Lanthanum salt is used for further modifying the Fe-Beta molecular sieve for the first time by adopting an impregnation method, so that the denitration temperature interval of the Fe-Beta molecular sieve is greatly widened, the denitration performance and hydrothermal stabilityof the Fe-Beta molecular sieve are improved, and the Fe-Beta molecular sieve is relatively good in sulfur poisoning resistance and relatively low in cost. The low-silicon composite metal Beta molecular sieve catalyst disclosed by the invention is mainly used for treating NOx-containing tail gas and flue gas, and has excellent NOx selective reduction capability, good hydrothermal stability and HC carbon deposition resistance and sulfur poisoning resistance in a low-temperature range.

Description

technical field [0001] The invention belongs to the technical field of denitrification catalysts, and in particular relates to a preparation method and application of a catalyst containing low-silicon composite metal Beta molecular sieves. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants. Atmospheric NO x It mainly comes from stationary sources such as industrial boilers and coal-fired power plants, and mobile sources such as diesel and gasoline vehicle exhaust. How to effectively remove NO produced by these two types of emission sources x has become a global issue. [0003] Ammonia selective catalytic reduction technology (NH 3 -SCR) as a relatively mature NO x Removal technology, the principle is that the reducing agent passes through the action of the catalyst to remove the NO in the flue gas or tail gas x Revert to harmless N 2 and H 2 O. Vanadium-based catalysts are currently the most widely used stationary source flue ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/30B01J37/02B01D53/86B01D53/94B01D53/56
CPCB01J29/7615B01J37/30B01J37/0201B01D53/8628B01D53/9418B01J2229/186B01J2229/20B01J2229/24B01J2229/38B01J2229/14B01J2229/40B01D2251/2062B01D2258/012B01D2258/0283Y02P20/52
Inventor 周彤程鸿魁郝伟李元东姜叶葳王闯袁龙
Owner CHIA TAI ENERGY MATERIALS DALIAN
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