Modified siliceous mesoporous material, preparation method and application thereof, and catalyst for preparing propylene by propane dehydrogenation, preparation method and application thereof
A mesoporous material, a technology for propane dehydrogenation, which is applied in the related fields, can solve the problems of low propane conversion rate and propylene selectivity, unfavorable active component dispersion, influence on catalytic effect, etc., and achieves good catalyst stability, good catalytic performance, The effect of high propylene selectivity
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[0054] According to a preferred embodiment of the present invention, the modification method of the siliceous mesoporous material includes:
[0055] (1) At 20-60°C and pH 8-12, first mix and stir the template agent hexadecyltrimethylammonium bromide, ammonia solution and deionized water for a period of time, for example, 20-40min, and then Add tetraethyl orthosilicate to the above mixture, continue to stir for a period of time, for example, 40-80min, to obtain a hydrolyzate; wherein, relative to 1mol of tetraethyl orthosilicate, the dosage of the template is 35-365g , the amount of deionized water is 1275-3600g;
[0056] Crystallize the hydrolyzate at 30-140° C. for 5-120 hours to obtain a crystallized product, and sequentially perform solid-liquid separation and drying on the crystallized product to obtain a high specific surface area siliceous mesoporous material raw powder, and heat-treating the raw powder of the high specific surface area siliceous mesoporous material at ...
Embodiment 1
[0095] This example is used to illustrate the preparation method of the propane dehydrogenation to propylene catalyst and its application in the propane dehydrogenation reaction.
[0096] (1) Preparation of high specific surface area siliceous mesoporous materials
[0097] At a temperature of 40°C, according to the dosage in Table 1, the templating agent hexadecyltrimethylammonium bromide, ammonia solution (25% by weight of ammonia concentration) and deionized water were mixed and stirred for 30 minutes, and ethyl orthosilicate The ester was slowly added to the above mixture, and the stirring was continued for 60 min. The mixture was transferred to a hydrothermal reaction kettle with a polytetrafluoroethylene liner, crystallized at 100°C for 48h, and then the solid product was separated from the mother liquor by filtration, washed 5 times with deionized water, and filtered at 120 Drying at ℃ for 6 hours to obtain high specific surface area siliceous mesoporous material raw po...
Embodiment 2-4
[0110] It is used to illustrate the preparation method of propane dehydrogenation to propylene catalyst and its application in propane dehydrogenation reaction.
[0111] Carry out the preparation method of propane dehydrogenation propylene catalyst and its application in propane dehydrogenation reaction according to the method of embodiment 1, difference is, change the preparation process and propane dehydrogenation of the high specific surface area siliceous mesoporous material in embodiment 1 In the preparation process of the hydrogen-to-propylene catalyst, the amount of each raw material used and the parameters of the high-temperature calcination process and the parameters of the ball milling conditions were changed, and Examples 2-4 were carried out to obtain high specific surface area siliceous mesoporous materials A2-A4, modified high specific surface area Silicon mesoporous materials C2-C4, and propane dehydrogenation to propylene catalysts Cat-2~Cat-4.
[0112] Table 1...
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Abstract
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