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Preparation method of oxide modified MCM-48 molecular sieve, and applications of oxide modified MCM-48 molecular sieve in denitration synergistic mercury removal

A MCM-48, molecular sieve technology, applied in the field of molecular sieve, can solve the problems of lack of system, in-depth understanding of reaction mechanism, difference in flue gas composition, poor poisoning performance, etc., and achieve good mercury removal performance, simple method and large pore size effect.

Active Publication Date: 2019-10-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The catalyst alone is resistant to SO 2 Poor poisoning performance, SO 2 It cannot be recovered after poisoning; strong acid and strong alkali are required in the preparation, and the pH must be adjusted during filtration and washing, and the operation is more complicated
[0013] Due to the different reaction temperature windows of low-temperature denitrification and high-temperature denitrification, the composition of flue gas is also quite different. There is a lack of systematic and in-depth understanding of the catalytic reaction mechanism of low-temperature (100-280°C) denitrification and mercury removal.

Method used

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  • Preparation method of oxide modified MCM-48 molecular sieve, and applications of oxide modified MCM-48 molecular sieve in denitration synergistic mercury removal
  • Preparation method of oxide modified MCM-48 molecular sieve, and applications of oxide modified MCM-48 molecular sieve in denitration synergistic mercury removal
  • Preparation method of oxide modified MCM-48 molecular sieve, and applications of oxide modified MCM-48 molecular sieve in denitration synergistic mercury removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In the first step, first dissolve MCM-48 molecular sieve in ethanol and reflux, wash and dry and repeat twice, then dissolve it in n-hexane and ultrasonically disperse, and add 3-aminopropyltriethoxysilane (APTES) dropwise. ) Continue to sonicate for 30 minutes; finally, move the treated MCM-48 molecular sieve into a water bath to reflux for 12 hours, filter, wash and dry for subsequent experiments.

[0062] The second step, pretreatment of manganese-based and lanthanum-based materials: weigh 2.5g 50% Mn(NO 3 ) 2 Solution, configure 50mL solution in a beaker; weigh 1.02g La(NO 3 ) 2 ·6H 2 O, configure 50mL solution in a beaker; mix the two solutions and mix well, indicating MnLa 0.5 Solution

[0063] The third step, weigh 5g of the treated MCM-48 molecular sieve, add Mn 2 In the beaker of La solution, mix well;

[0064] The fourth step, put the mixed solution in a magnetic stirrer, stir at a uniform speed for 12 hours at room temperature, and then put the mixed solution in an ...

Embodiment 2

[0068] The difference from Example 1 is that

[0069] In the second step, the mixed solution is Mn 2 Co solution.

[0070] Select the simulated flue gas NO content of 0.1%, NH 3 Content 0.12%, O 2 The content is 5%, the rest is N 2 Perform balance gas, and at the same time, obtain a certain concentration of Hg in the mercury permeation tube by changing the temperature of the water bath 0 Steam, Hg 0 The flow rate of the carrier gas is 90mL / min, the total gas flow rate is 667mL / min, and the space velocity is 10000h -1 , Carry out denitration and mercury removal experiments in the temperature range of 100-260℃. The experimental results show that the denitration efficiency is about 95% at 160-240°C, and the mercury removal efficiency is about 94%.

Embodiment 3

[0072] The difference from Example 1 is that

[0073] In the second step, the mixed solution is Mn 2 Ce solution.

[0074] Select the simulated flue gas NO content of 0.1%, NH 3 Content 0.12%, O 2 The content is 5%, the rest is N 2 Perform balance gas, and at the same time, obtain a certain concentration of Hg in the mercury permeation tube by changing the temperature of the water bath 0 Steam, Hg 0 The flow rate of the carrier gas is 90mL / min, the total gas flow rate is 667mL / min, and the space velocity is 10000h -1 , Carry out denitration and mercury removal experiments in the temperature range of 100-260℃. The experimental results show that the denitration efficiency is about 95% at 160-240°C, and the mercury removal efficiency is about 92%.

[0075] From the foregoing Examples 1 to 3, it can be seen that the temperature range for denitration and mercury removal of the present invention should be controlled at 160-240°C, and the manganese lanthanum oxide modified MCM-48 catalyst h...

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Abstract

The invention discloses a preparation method of an oxide modified MCM-48 molecular sieve, and applications of the oxide modified MCM-48 molecular sieve in denitration synergistic mercury removal, andrelates to the technical field of molecular sieves. The method comprises: pre-treating a MCM-48 molecular sieve with no templating agent removal; synthesizing a MnN mixed solution by using a manganeseoxide as an active material and using a N oxide as an auxiliary agent; adding the MnN mixed solution to the molecular sieve, carrying out impregnation treatment, and drying; calcining the dried molecular sieve in air; and finally obtaining the oxide modified MCM-48 molecular sieve. According to the present invention, NOx and Hg0 removal experiments are performed on the prepared oxide modified MCM-48 molecular sieve, and denitration and mercury removal efficiency experiments are performed on the prepared oxide modified MCM-48 molecular sieve having different manganese-to-lanthanum molar ratiosby using different molar ratios, wherein the experiment results prove that the oxide modified MCM-48 molecular sieve has good mercury removal performance while can efficiently remove NOx at a low temperature.

Description

Technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a method for preparing molecular sieves for denitration and mercury removal. Background technique [0002] MCM-48 molecular sieve is a uniform pore size of about 2.6nm, two sets of mutually independent three-dimensional spiral tunnel structure, with good long-range periodicity and structural characteristics of stable framework, with good hydrothermal and thermal stability Therefore, it is particularly suitable for high-temperature processes and is likely to be developed as an excellent industrial catalyst. It has very attractive application prospects in selective catalysis, adsorption and separation of macromolecules, etc., and can be used as an adsorbent and catalytic material in industry. And because of its large pore size, it can well adsorb heavy metal ions that have a large Hg plasma radius and are not easily adsorbed by the microporous molecular sieve from wastewater. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/04B01J37/10B01J37/34B01D53/86B01D53/64B01D53/56
CPCB01J29/0341B01J29/045B01J37/10B01J37/343B01D53/8665B01D53/8628B01J2229/18
Inventor 张华伟张明珠梁鹏焦甜甜张亚青张文睿
Owner SHANDONG UNIV OF SCI & TECH
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