Propane dehydrogenation catalyst and preparation method thereof and method for preparing propylene by propane dehydrogenation
A propane dehydrogenation and catalyst technology, applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as easy deactivation, low propane conversion rate, low propylene selectivity, and unstable mesopore structure. Achieve the effect of appropriate pore size, uniform distribution of pore structure and good structural stability
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Embodiment 1
[0063] This example is used to illustrate the propane dehydrogenation catalyst and its preparation method.
[0064] (1) Preparation of the carrier
[0065] Cetyltrimethylammonium bromide and tetraethyl orthosilicate are added in the ammonia solution that the concentration is 25% by weight, wherein, the add-on of tetraethylorthosilicate is 1g, and the molar feeding ratio is ethyl orthosilicate. Ester: cetyl trimethyl ammonium bromide: ammonia water (25%): deionized water = 1: 0.37: 2.8: 142, stirred at 80 °C until dissolved, the solution was suction filtered and the mesoporous material was filtered. The filter cake is washed to pH 7 to obtain a mesoporous molecular sieve filter cake A1 with a two-dimensional hexagonal pore structure;
[0066] The water glass with a concentration of 15% by weight and the sulfuric acid solution with a concentration of 12% by weight and n-butanol are fully reacted at 30 ° C for 1.5 hours according to the weight ratio of water glass: sulfuric acid...
Embodiment 2
[0094] This example is used to illustrate the propane dehydrogenation catalyst and its preparation method.
[0095] (1) Preparation of the carrier
[0096] Cetyltrimethylammonium bromide and tetraethyl orthosilicate are added in the ammonia solution that the concentration is 25% by weight, wherein, the add-on of tetraethylorthosilicate is 1g, and the molar feeding ratio is ethyl orthosilicate. Ester: cetyl trimethyl ammonium bromide: ammonia water (25%): deionized water = 1: 0.5: 3.5: 150, stirred at 80 °C until dissolved, the solution was suction filtered and the mesoporous material was filtered. The filter cake was washed to a pH of 7 to obtain a mesoporous molecular sieve filter cake A2 with a two-dimensional hexagonal pore structure;
[0097] The water glass with a concentration of 15% by weight, a sulfuric acid solution with a concentration of 12% by weight and n-butanol, and the water glass: sulfuric acid: n-butanol weight ratio = 6: 1: 1 were fully reacted at 60 ° C fo...
Embodiment 3
[0108] This example is used to illustrate the propane dehydrogenation catalyst and its preparation method.
[0109] Cetyltrimethylammonium bromide and tetraethyl orthosilicate are added in the ammonia solution that the concentration is 25% by weight, wherein, the add-on of tetraethylorthosilicate is 1g, and the molar feeding ratio is ethyl orthosilicate. Ester: cetyl trimethyl ammonium bromide: ammonia water (25%): deionized water = 1: 0.4: 3: 130, stirred at 60 °C until dissolved, the solution was suction filtered and the mesoporous material was filtered. The filter cake is washed to a pH of 7 to obtain a mesoporous molecular sieve filter cake A3 with a two-dimensional hexagonal pore structure;
[0110] Water glass with a concentration of 15 wt %, sulfuric acid solution with a concentration of 12 wt % and n-butanol, and the water glass: sulfuric acid: n-butanol weight ratio = 3: 1: 1 were fully reacted at 10 ° C for 5 h, The pH of sulfuric acid with a concentration of 98% by...
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