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Cu-AEI molecular sieve catalyst containing rare earth and preparation method thereof

A molecular sieve and catalyst technology, which is applied in the rare earth-containing Cu-AEI molecular sieve catalyst and its preparation field, can solve the problems of unsatisfactory dispersion uniformity of rare earth elements and difficulty of rare earth elements, so as to improve SCR catalytic activity, reduce production cost, reduce The effect of emissions

Inactive Publication Date: 2018-11-13
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Molecular sieves doped with rare earth elements are mostly prepared by traditional ion exchange methods, but due to the large hydration ion radius of rare earth elements, it is difficult to introduce rare earth elements through ion exchange, and the dispersion uniformity of rare earth elements is not ideal.

Method used

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  • Cu-AEI molecular sieve catalyst containing rare earth and preparation method thereof
  • Cu-AEI molecular sieve catalyst containing rare earth and preparation method thereof
  • Cu-AEI molecular sieve catalyst containing rare earth and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A Cu-AEI molecular sieve catalyst containing rare earth elements is prepared by the following method:

[0034] (1) Synthesis of AEI molecular sieves containing rare earth elements

[0035] 38.4380g water glass (Na 2 O: 7.39wt%, SiO 2 : 23.9wt%) and 0.4763gLa (NO 3 ) 3 ·6H 2 O was added to 19.08 g of 1,1-dimethyl-3,5-dimethylpiperidinium aqueous solution with a concentration of 25 wt%, and after stirring evenly, 4.8898 g of HY molecular sieve (Si / Al=5.2), 0.7919 g of NaOH Granules and 36.4273g deionized water, continue to stir until all raw materials are mixed evenly, finally the composition of the sol is: Na 2 O: SiO 2 :Al 2 o 3 :RE 2 o 3 :OSDA:H 2 O=0.26:1.0:0.055:0.005:0.14:20. The obtained sol was transferred to a polytetrafluoroethylene-lined hydrothermal crystallization kettle, and was dynamically crystallized at 160° C. for 5 days at 20 rpm. Subsequently, the obtained solid product was successively filtered, washed, dried at 110°C for 6 hours, and cal...

Embodiment 2

[0039] A Cu-AEI molecular sieve catalyst containing rare earth elements is prepared by the following method:

[0040] (1) Synthesis of AEI molecular sieves containing rare earth elements

[0041] 35.6827g silica sol (Na 2 O: 0.1wt%, SiO 2 : 26.84wt%) and 0.6377g LaCl 3 Add to 31.80g 1,1-dimethyl-2,6-dimethylpiperidinium aqueous solution with a concentration of 25wt%, stir evenly, then add 3.2323g HY molecular sieve (Si / Al=5.2), 3.1997g NaOH particles And 14.8802g deionized water, continue to stir until all raw materials are mixed evenly, finally obtain the composition of sol and be: Na 2 O: SiO 2 :Al 2 o 3 :RE 2 o 3 :OSDA:H 2 O=0.20:1.0:0.039:0.013:0.25:18. The obtained sol was transferred to a polytetrafluoroethylene-lined hydrothermal crystallization kettle, and was dynamically crystallized at 170° C. for 5 days at 20 rpm. Subsequently, the obtained solid product was successively filtered, washed, dried at 110° C. for 6 hours, and calcined at 550° C. for 6 hours t...

Embodiment 3

[0045] A Cu-AEI molecular sieve catalyst containing rare earth elements is prepared by the following method:

[0046] (1) Synthesis of AEI molecular sieves containing rare earth elements

[0047] Add 81.9606g of deionized water to 19.22g of 25wt% 1,1-diethyl-3,5-dimethylpiperidinium aqueous solution, then add 11.8724g of white carbon black and 1.8667g of Ce(NO 3 ) 3 ·6H 2 O, after stirring evenly, add 1.3261gHY molecular sieve (Si / Al=5.2) and 4.2795gNaOH particles successively, and continue to stir until all raw materials are mixed evenly, and finally the composition of the sol obtained is: NaOH 2 O: SiO 2 :Al 2 o 3 :RE 2 o 3 :OSDA:H 2 O=0.25:1.0:0.015:0.02:0.12:25. The obtained sol was transferred to a polytetrafluoroethylene-lined hydrothermal crystallization kettle, and was dynamically crystallized at 160° C. for 6 days at 20 rpm. Subsequently, the obtained solid product was successively filtered, washed, dried at 110° C. for 6 hours, and calcined at 550° C. for 6...

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Abstract

The invention discloses a Cu-AEI molecular sieve catalyst containing rare earth and a preparation method thereof. The preparation method comprises the following steps: mixing and stirring an FAU typesilicon-aluminum molecular sieve as an initial reaction material, other silicon sources and alkali sources, salts of rare earth elements and an alkyl pyridinium type organic template agent in proportion to form sol and dynamically crystallizing and synthesizing the AEI molecular sieve containing the rare earth elements at a temperature of 140-200 DEG C; performing ion exchange on the AEI molecularsieve containing the rare earth elements and a salt solution of Cu to obtain the Cu-AEI molecular sieve catalyst containing the rare earth elements. The rare earth elements are introduced into the molecular sieve in situ in the synthesis process, so that not only is the preparation process is simplified, but also the stability of the molecular sieve can be improved. The catalyst disclosed by theinvention is used for treating nitrogen oxides contained in an automobile exhaust gas treatment system, shows excellent selective reduction performance and has good sulfur resistance and hydrothermalstability.

Description

technical field [0001] The invention relates to a rare earth-containing Cu-AEI molecular sieve catalyst and a preparation method thereof, in particular to a rare earth-containing Cu-AEI molecular sieve catalyst used for purification treatment of nitrogen oxide-containing automobile tail gas. Background technique [0002] Nitrogen oxide (NOx) is one of the main pollutants in the atmosphere. It not only causes the formation of photochemical smog and acid rain, destroys the ecological environment, but also causes diseases such as emphysema and bronchus in humans, and even endangers human life. Therefore, The elimination of nitrogen oxides is imminent. Regarding the elimination technology of nitrogen oxides, the catalyst is the core of its technology and the key to the success or failure of the entire catalytic reaction system. Denitration catalysts based on molecular sieve systems have received extensive attention and have been deeply researched and developed. [0003] In rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/30C01B39/04C01B39/06B01D53/86B01D53/94B01D53/56
CPCB01D53/8628B01D53/9418B01J29/76B01J37/30B01J2229/183B01J2229/186C01B39/04C01B39/06
Inventor 史丽华李进王炳春
Owner CHINA CATALYST HLDG CO LTD