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Preparation method of Beta-type molecular sieve resistant to propylene poisoning

A beta type, molecular sieve technology, applied in the field of composite catalyst synthesis and performance research, can solve the problems of catalyst carbon deposition and deactivation, and achieve the effect of wide reaction temperature window and excellent low temperature activity.

Active Publication Date: 2018-12-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that the inevitable hydrocarbon emissions in the exhaust gas will cause different degrees of catalyst carbon deposition and deactivation

Method used

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  • Preparation method of Beta-type molecular sieve resistant to propylene poisoning
  • Preparation method of Beta-type molecular sieve resistant to propylene poisoning
  • Preparation method of Beta-type molecular sieve resistant to propylene poisoning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Fe-Beta+MnO x (FM) preparation and activity evaluation

[0027] 1) Preparation of Fe-Beta:

[0028] A series of Fe-Beta catalysts were prepared by equal-volume impregnation method with ferrocene toluene solution using template-free Beta molecular sieves (Si / Al≈9) as supports. The specific steps are as follows: first, put Na-Beta molecular sieves in 0.5mol / L ammonium nitrate solution, stir vigorously at 80°C for 4h, then suction filter, wash, and dry at 120°C for 8-12h, and the obtained sample is used again with the same After exchange of concentrated ammonium nitrate solution, NH 4 -Beta molecular sieve; then, accurate measurement of NH 4 -Toluene saturated adsorption capacity of Beta molecular sieve, add the required amount of ferrocene to the corresponding toluene to make a solution, and then slowly add the ferrocene toluene solution to the NH 4 -Beta molecular sieve, stir evenly, stand at room temperature for more than 50h; finally calcinate the obtaine...

Embodiment 2

[0034] Example 2 Fe-Beta+CeO 2 Preparation and Activity Evaluation of (FC)

[0035] The steps and process conditions of this embodiment are all the same as in Example 1, the difference is that the CeO 2 (Tianjin Huahong New Material Co., Ltd.) to replace MnO x , thus preparing Fe-Beta+CeO 2 (FC) catalyst.

[0036] With CeO 2 The activity of the catalyst FC as an auxiliary agent increases slightly between 200 and 300°C, but the range is not obvious. However, the catalyst has better activity at high temperature, and the activity between 300 and 450°C is above 90%.

Embodiment 3

[0041] Example 3 Fe-Beta+MnO x / CeO 2 (FMC3) preparation and activity evaluation

[0042] The steps and process conditions of this embodiment are all the same as in Example 1, the difference is that the MnO x / CeO 2 replace MnO x (wherein, MnO x / CeO 2 The preparation method is the same as that of Comparative Example 1), thereby preparing Fe-Beta+MnO x / CeO 2 (FMC3) catalyst.

[0043] When the MnO x / CeO 2 When used as an auxiliary agent, the activity of the catalyst at 150°C is increased from 19% to 35%, and it can maintain a conversion rate of more than 90% between 200 and 400°C. Compared with pure Fe-Beta or MnO x / CeO 2 The activity of the catalyst is much higher than that of the catalyst, which shows that the catalyst prepared by the mechanical mixing method can obtain the ideal result and effectively increase the NH content of propylene in the atmosphere. 3 - Activity of molecular sieves in SCR reactions.

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Abstract

The invention discloses a preparation method of a Beta-type molecular sieve resistant to propylene poisoning. The preparation method comprises the following steps: taking a Fe-supported Beta-type molecular sieve with the pore diameter of 6.3-6.8 angstrom as a substrate; adding an oxide auxiliary agent into the molecular sieve substrate, stirring uniformly, and grinding for 40-90 min; roasting a sample after the mechanical mixing and grinding for 4 h at a heating rate of 2-5 DEG C / min in the air of 500 DEG C, wherein the oxide auxiliary agent is selected from the group comprising MnOx, CeO2 orMnOx / CeO2, and the loading amount of MnOx is 50% in the MnOx / CeO2. When being applied to a propylene-containing NH3-SCR reaction in the atmosphere, the prepared catalyst has the characteristics of high activity and high resistance to sulfur-poisoning property, and makes up for the defects that the conventional catalyst is poor in resistance to propylene poisoning performance or poor in resistanceto sulfur-poisoning property.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide control in environmental protection, and specifically relates to the synthesis and performance research of a composite catalyst based on molecular sieves and oxides. Background technique [0002] NO x Emission sources include stationary sources (production, combustion of fossil fuels such as coal and oil in daily life, and exhaust from factories using nitric acid in production) and mobile sources (motor vehicle exhaust). In recent years, people's calls for environmental protection are getting higher and higher. Industrial developed countries such as the United States, Japan, South Korea and Europe have successively formulated and implemented new emission standards in recent years, and the restrictions on NO emission have become increasingly strict. Therefore, how to control nitrogen oxides has become a research hotspot at home and abroad. NH 3 Selective Catalytic Reduction of NO x (NH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01D53/86B01D53/56
CPCB01D53/8628B01J29/7815B01J2229/18Y02T10/12
Inventor 石川赵琦白志凤陈冰冰
Owner DALIAN UNIV OF TECH
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