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Cu-SSY-39 molecular sieve, and preparation method and application thereof

A cu-ssz-39, molecular sieve technology, applied in the direction of molecular sieves and base exchange compounds, separation methods, chemical instruments and methods, etc., can solve the problems of complicated process, high time, high economic cost, economic and environmental benefits, etc. , to achieve the effects of simplified preparation method, excellent nitrogen selectivity, and wide temperature window

Active Publication Date: 2019-11-19
合肥中科弘逸环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses the method of obtaining Na-SSZ-39 first, and then preparing Cu-SSZ-39 through two-step exchange of ammonium nitrate and copper nitrate. The process is complicated, and the time and economic costs are high.
At the same time, in the process of preparing Na-SSZ-39, the patent uses high-silicon Y molecular sieve as the raw material for crystal transformation, and the synthesis process of high-silicon Y molecular sieve needs complex post-treatment processes such as dealumination and silicon supplementation, and its economic benefits and Environmental benefits need to be improved

Method used

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  • Cu-SSY-39 molecular sieve, and preparation method and application thereof
  • Cu-SSY-39 molecular sieve, and preparation method and application thereof
  • Cu-SSY-39 molecular sieve, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The nitrogen-containing organic template used in this example is N,N-diethyl-2,6-dimethylpiperidine, and its preparation method includes the following steps:

[0087] (a) Mix 35g of cis-2,6-dimethylpiperidine, 180g of iodoethane, 70g of potassium bicarbonate and 120g of methanol, and carry out stirring and reflux reaction at 50°C for 4 days;

[0088] (b) Rotating the product of the reflux reaction of step (a) to remove the liquid, then adding chloroform for dissolution, and suction filtering to remove the solid to obtain a mixed solution;

[0089] (c) Rotate the mixed solution obtained in step (b) to remove chloroform, then add ethanol and ether for recrystallization to obtain N,N-diethyl-cis-2,6-dimethylpiperidinium iodide powder ;

[0090] (d) dissolving the recrystallized product of step (c) in water and performing ion exchange with a hydroxide type cation resin to obtain the nitrogen-containing organic template, which is N,N-diethyl- 2,6-Dimethylpiperidine.

[00...

Embodiment 2

[0101] The difference between this example and Example 1 is that the raw materials in step (a) are replaced by 40g cis-2,6-dimethylpiperidine, 200g ethyl iodide, 80g potassium bicarbonate and 150g methanol, other conditions and implementation Exactly the same as compared to Example 1.

[0102] The mass percent content of Cu element in the Cu-SSZ-39 molecular sieve obtained in this example is 2.1%.

[0103] Cu-SSZ-39 molecular sieve was prepared in this example, and under the test conditions of the present invention, the removal rate of nitrogen oxides in the temperature range of 250°C-500°C was maintained above 75%, and the nitrogen selectivity was 150%. ℃-550 ℃ temperature range are maintained at more than 95%. It can be seen that the Cu-SSZ-39 molecular sieve catalyst synthesized in this example has excellent NH 3 - SCR activity and nitrogen selectivity.

Embodiment 3

[0105] The difference between this example and Example 1 is that in step (a), the mass of cis-2,6-dimethylpiperidine is replaced by cis-3,5-dimethylpiperidine, and the ZSM-5 The silicon-aluminum ratio of the molecular sieve is 12, and other conditions are exactly the same as those in Example 1.

[0106] The mass percent content of Cu element in the Cu-SSZ-39 molecular sieve obtained in this example is 2.1%.

[0107] This example prepares Cu-SSZ-39 molecular sieve, under the test conditions of the present invention, its removal rate of nitrogen oxides in the temperature range of 250°C-550°C is maintained above 80%, and the nitrogen selectivity is between The temperature range of 150°C-550°C is maintained above 95%. It can be seen that the Cu-SSZ-39 molecular sieve catalyst synthesized by this example has excellent NH 3 - SCR activity and nitrogen selectivity.

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Abstract

The invention relates to a Cu-SSZ-39 molecular sieve, and a preparation method and application thereof. The preparation method for the Cu-SSZ-39 molecular sieve comprises the following steps: with a ZSM-5 molecular sieve as a silicon source and an aluminum source, mixing the ZSM-5 molecular sieve with a nitrogen-containing organic template agent, water, a copper source, tetraethylenepentamine andan alkali source, and then carrying out a reaction, crystallization and roasting successively to obtain the Cu-SSZ-39 molecular sieve. According to the method of the invention, the above raw materialsare subjected to the one-step hydrothermal reaction so as to prepare the Cu-SSZ-39 molecular sieve which has good NH3-SCR catalytic activity, nitrogen selectivity, hydrothermal stability and resistance to high space velocities; and the raw material ZSM-5 molecular sieve used in the preparation process is widely available and low in cost, so the prepared Cu-SSZ-39 molecular sieve has certain economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a Cu-SSZ-39 molecular sieve and its preparation method and application. Background technique [0002] Nitrogen oxides are an important pollutant in the atmosphere and play an important role in the formation of air pollution phenomena such as haze and photochemical smog. The sources of nitrogen oxides are divided into natural sources and man-made sources. Man-made emissions are mainly divided into stationary sources and mobile sources. The latter is more difficult to control because of its large and scattered emissions. Among the stationary source and mobile source denitrification technologies, ammonia selective catalytic reduction technology plays a dominant role. [0003] in NH 3 -SCR technology, WO 3 or MoO 3 load V 2 o 5 -TiO 2 Catalysts have been used as the main catalysts for stationary source and mobile source denitrification. With the increasingly stringent emiss...

Claims

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Application Information

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IPC IPC(8): C01B39/48C01B39/04B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062C01B39/04C01B39/48C01P2002/72
Inventor 贺泓杜金鹏单玉龙余运波石晓燕
Owner 合肥中科弘逸环保科技有限责任公司
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