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
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[0021] Example 1
[0022] Take commercial NH 4 -Y(Si / Al=5.3) zeolite 10g, placed in a tube furnace at 700℃ under water vapor for 4h dealumination, then this dealuminated Y-type molecular sieve is treated in a sulfuric acid solution with a concentration of 0.74M at 75℃ for 4h , USY molecular sieve was obtained as the aluminum source and silicon source for the synthesis of Cu-SSZ-39. Mix 20g of tetraethylphosphonium bromide with 100g of deionized water, then add 10g of hydroxide ion exchange resin, stir in a water bath at 30℃ for 3h, and filter to obtain the template tetraethylhydrogen required for the synthesis of Cu-SSZ-39 Phosphorus oxide. The raw materials of each reaction, namely silica, alumina, copper sulfate-tetraethylenepentamine, organic mold, sodium oxide, water and template agent, are added in a molar ratio of 1.0:0.04:0.025:0.6:0.3:30. , Wherein the organic template is tetraethyl phosphine hydroxide, and the silicon source and aluminum source are USY molecular sieves...
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[0023] Example 2
[0024] The raw materials of each reaction, namely silica, alumina, organic mold, sodium oxide, water and template agent, are fed in a molar ratio of 1.0:0.04:0.6:0.3:30, wherein the organic template is tetraethyl Phosphine hydroxide, silicon source and aluminum source are USY molecular sieves. The completely stirred gel is placed in a hydrothermal reaction kettle for reaction. After the reaction is completed, it is cooled to room temperature, filtered by centrifugation, 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 1.0M ammonium nitrate solution. After 12h in 80℃ oil bath, wash and filter with distilled water, dry at 110℃ 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, then rotary evaporate the exce...
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[0025] Example 3
[0026] The raw materials of each reaction, namely silica, alumina, organic mold, sodium oxide, water and template agent, are fed in a molar ratio of 1.0:0.04:0.6:0.3:30, wherein the organic template is tetraethyl Phosphine hydroxide, silicon source and aluminum source are USY molecular sieves. The completely stirred gel is placed in a hydrothermal reaction kettle for reaction. After the reaction is completed, it is cooled to room temperature, filtered by centrifugation, 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 1.0M ammonium nitrate solution. After 12h in 80℃ oil bath, wash and filter with distilled water, dry at 110℃ for 12h, repeat the above steps to obtain NH 4 -SSZ-39 molecular sieve. 5g NH 4 -SSZ-39 molecular sieve is placed in Cu(CH3COO) with a concentration of 0.15M 2 In the aqueous solution, after 12h in an oil bath at 80℃, was...
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