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Preparation method for synthesizing Cu-SSZ-39 molecular sieve based catalyst by using one-step method and application

A molecular sieve and catalyst technology, which is applied in the field of preparing Cu-SSZ-39 catalysts by double-template one-step method, can solve the problems of high industrial application cost, long catalyst preparation period, complicated steps, etc., achieve high crystallinity and avoid ion exchange. And calcination process, the effect of simple process

Inactive Publication Date: 2017-06-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the template used in this two-step method for preparing Cu-SSZ-39 is relatively cheap, the subsequent process requires ammonium exchange and copper exchange. The process is more complicated than the one-step method, the catalyst preparation cycle is long, and the cost of industrial application is high.

Method used

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  • Preparation method for synthesizing Cu-SSZ-39 molecular sieve based catalyst by using one-step method and application
  • Preparation method for synthesizing Cu-SSZ-39 molecular sieve based catalyst by using one-step method and application
  • Preparation method for synthesizing Cu-SSZ-39 molecular sieve based catalyst by using one-step method and application

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Embodiment 1

[0022] Take Commercial NH 4- Y (Si / Al=5.3) zeolite 10g, placed in a tube furnace and dealuminated under steam at 700°C for 4h, and then treated the dealuminated Y-type molecular sieve in a sulfuric acid solution with a concentration of 0.74M at 75°C for 4h , USY molecular sieves were obtained as aluminum and silicon sources for the synthesis of Cu-SSZ-39. Mix 20g of tetraethylphosphine bromide and 100g of deionized water evenly, then add 10g of hydroxide ion exchange resin, stir in a water bath at 30°C for 3 hours, and then filter to obtain the tetraethylhydrogen template required for the synthesis of Cu-SSZ-39 Phosphorus oxide. The raw materials for each reaction, namely silicon dioxide, aluminum oxide, copper sulfate-tetraethylenepentamine, organic mold, sodium oxide, water and templating agent, are fed according to the molar ratio of 1.0:0.04:0.025:0.6:0.3:30 , wherein the organic template is tetraethylphosphine hydroxide, the silicon source and the aluminum source are US...

Embodiment 2

[0024] The amount of each reaction raw material, namely silica, alumina, organic mold, sodium oxide, water and templating agent, is fed according to the molar ratio of 1.0:0.04:0.6:0.3:30, wherein the organic template is tetraethyl The base phosphine hydroxide, silicon source and aluminum source are USY molecular sieves. The fully stirred gel was placed in a hydrothermal reactor for reaction, cooled to room temperature after the reaction was completed, centrifugally filtered, washed with deionized water, dried, and calcined at 550°C to obtain Na-SSZ-39 molecular sieve catalyst. Take 10g of Na-SSZ-39 molecular sieve and place it in 500ml of ammonium nitrate solution with a concentration of 1.0M. After 12h in an oil bath at 80°C, wash and filter with distilled water, and dry at 110°C for 12h. Repeat the above steps to obtain NH 4 - SSZ-39 molecular sieve. 5g NH 4 -Add 5ml of SSZ-39 molecular sieve to dissolve 0.625g Cu(CH3COO) 2 In the aqueous solution, ultrasonic for 2h, the...

Embodiment 3

[0026] The amount of each reaction raw material, namely silica, alumina, organic mold, sodium oxide, water and templating agent, is fed according to the molar ratio of 1.0:0.04:0.6:0.3:30, wherein the organic template is tetraethyl The base phosphine hydroxide, silicon source and aluminum source are USY molecular sieves. The fully stirred gel was placed in a hydrothermal reactor for reaction, cooled to room temperature after the reaction was completed, centrifugally filtered, washed with deionized water, dried, and calcined at 550°C to obtain Na-SSZ-39 molecular sieve catalyst. Take 10g of Na-SSZ-39 molecular sieve and place it in 500ml of ammonium nitrate solution with a concentration of 1.0M. After 12h in an oil bath at 80°C, wash and filter with distilled water, and dry at 110°C for 12h. Repeat the above steps to obtain NH 4 - SSZ-39 molecular sieve. 5g NH 4 -SSZ-39 molecular sieve placed in Cu(CH3COO) at a concentration of 0.15M 2 In the aqueous solution, after 12 hours...

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Abstract

The invention provides a preparation method for synthesizing a Cu-SSZ-39 molecular sieve based catalyst by using a one-step method and application. By using the one-step method, the Cu-SSZ-39 molecular sieve based catalyst is synthesized through a double template; the copper load is controlled at 2.00-5.00 wt.% by controlling the input ratio of copper sulfate-tetraethylenepentamine to the organic template; and meanwhile, the silica-alumina ratio of USY is controlled to reach the silica-alumina ratio of 4.5-16.4 in the controlled product so that the Cu-SSZ-39 molecular sieve based catalyst with higher degree of crystallization, excellent catalytic activity and hydrothermal stability; and the Cu-SSZ-39 molecular sieve based catalyst is suitable for the nitrogen oxide purification processes in diesel vehicle aftertreatment Urea-SCR system catalysts and fixed sources NH3-SCR. Compared with the existing synthetic method, the preparation method for synthesizing the Cu-SSZ-39 molecular sieve based catalyst by using the one-step method, provided by the invention, has the advantages that the process is simple, repeated uses of an ammonium nitrate and copper salt solution ion exchanging and calcining process are avoided, and a defect that the traditional one-step synthetic method can only load an active component through the later ion exchanging process is overcome. By using the cheap template, the preparation method for synthesizing the Cu-SSZ-39 molecular sieve based catalyst by using the one-step method greatly reduces the production cost and is beneficial for industrial amplification applications.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and relates to the preparation of Cu-SSZ-39 molecular sieve catalysts, in particular to a method for preparing Cu-SSZ-39 catalysts in one step with double templates, and the catalyst prepared by the method is used for diesel vehicles Selective catalytic reduction (NH3-SCR) process of nitrogen oxides in exhaust gas. Background technique [0002] As a major air pollutant, nitrogen oxides mainly come from factory exhaust and motor vehicle exhaust. Among them, diesel vehicle exhaust nitrogen oxides (NO x ) pollution has become one of the most prominent problems in my country's air pollution. With the increasingly prominent environmental problems and the increasing requirements of environmental protection laws and regulations on diesel vehicle exhaust emissions, the treatment of nitrogen oxides in diesel vehicle exhaust has become a hot issue in today's society. Select...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/94B01D53/56
CPCB01D53/9418B01D2257/404B01D2258/012B01J29/76Y02A50/20Y02T10/12
Inventor 李涛范驰陈真
Owner HUAZHONG UNIV OF SCI & TECH
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