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A kind of 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, deactivation, etc., and achieve the effect of wide reaction temperature window and excellent low-temperature activity

Active Publication Date: 2022-07-08
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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  • A kind of preparation method of beta-type molecular sieve resistant to propylene poisoning
  • A kind of preparation method of beta-type molecular sieve resistant to propylene poisoning
  • A kind of 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 Preparation and activity evaluation of (FM)

[0027] 1) The preparation of Fe-Beta:

[0028] A series of Fe-Beta catalysts were prepared by isovolumetric impregnation method with ferrocene toluene solution using template-free synthesized Beta molecular sieve (Si / Al≈9) as support. The specific steps are: firstly put Na-Beta molecular sieve 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, the obtained sample is again with the same After the concentration of ammonium nitrate solution exchange, NH is obtained 4 - Beta molecular sieve; then, accurate measurement of NH 4 -Toluene saturation adsorption capacity of Beta molecular sieve, add the calculated amount of ferrocene to the corresponding toluene to make a solution, and then slowly add the ferrocene toluene solution dropwise to NH 4 - Beta molecular sieve, stir evenly, and stand at room temperature for more than 50 ho...

Embodiment 2

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

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

[0036] with CeO 2 The activity of catalyst FC, which is used as an auxiliary agent, is slightly improved between 200 and 300 °C, but the magnitude is not obvious. However, the catalyst has good 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 Preparation and activity evaluation of (FMC3)

[0042] The steps and process conditions of this example are the same as those of Example 1, the difference is that MnO is used x / CeO 2 Replacing MnO x (among them, 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 MnO x / CeO 2 When used as a promoter, the activity of the catalyst at 150°C is increased from 19% to 35%, and the conversion rate can be maintained above 90% between 200 and 400°C, which is comparable to that of pure Fe-Beta or MnO. x / CeO 2 The activity of the propylene-containing NH in the atmosphere has been greatly improved, indicating that the catalyst prepared by the mechanical mixing method can obtain ideal results and effectively improve the NH of propylene in the atmosphere. 3 - Activity of molecular sieves in the SCR reaction.

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Abstract

The invention discloses a preparation method of Beta-type molecular sieve resistant to propylene poisoning. The Beta-type molecular sieve with Fe-loaded pore diameter of 6.3-6.8 is used as the base; oxide additives are added to the molecular sieve base, stirred evenly, and ground for 40-90 minutes ; The sample after mechanical mixing and grinding is calcined in air at 500°C for 4 hours at a heating rate of 2 to 5°C / min; wherein, the oxide auxiliary is selected from MnO x , CeO 2 or MnO x / CeO 2 , the MnO x / CeO 2 In, MnO x The load is 50%. Application of the prepared catalyst to propylene-containing NH in atmosphere 3 In the SCR reaction, it has the characteristics of high activity and high anti-sulfur poisoning performance, which makes up for the shortcomings of the existing catalysts that have poor anti-propylene poisoning performance or poor anti-sulfur poisoning performance.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide control in environmental protection, and particularly relates to the synthesis and performance research of a composite catalyst based on molecular sieve and oxide. Background technique [0002] NO x Emission sources include stationary sources (production, combustion of fossil fuels such as coal and petroleum in daily life, and exhaust from factories that use nitric acid) and mobile sources (vehicle exhaust). In recent years, people's voices for environmental protection are getting louder and louder. 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 emission restrictions on NO 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 3 -SCR) is c...

Claims

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Application Information

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Patent Type & Authority Patents(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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