Low-green-coke catalytic cracking catalyst and preparation method thereof
A catalytic cracking and catalyst technology, which is applied in the direction of catalyst activation/preparation, catalytic cracking, physical/chemical process catalysts, etc., can solve the problem of high coke formation of catalytic cracking catalysts, and achieve high propylene selectivity, high yield, and high propylene concentration Effect
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[0046] According to the preparation method of catalytic cracking catalyst provided by the present invention, the NSY molecular sieve synthesized by the in-situ crystallization of kaolin is a Y-type molecular sieve composite material, and a preparation method thereof comprises the following steps: (1) mixing kaolin at 500-900 ℃ Roasting and dehydration into metakaolin, crushing to make metakaolin powder with a particle size of less than 10 microns; (2) adding sodium silicate, guiding agent, sodium hydroxide solution and water to the metakaolin powder to make a molar ratio (1-2.5)Na 2 O: Al 2 o 3 : (4-9) SiO 2 : (40-100)H 2 The reaction raw material A of O, wherein the mass ratio of directing agent to metakaolin is 0.01-1.0; (3) The reaction raw material A is crystallized under stirring at 88-98°C, and the second silicon is added after the crystallization time reaches 1-70h source to obtain the reaction raw material B, wherein, in terms of silicon oxide, the second silicon s...
preparation Embodiment 1
[0075] (1) 100 kilograms of pulverized metakaolin powders are added with 400 kilograms of sodium silicate solution (containing 20.05% by weight of SiO2) under stirring. 2 , 6.41 wt% Na 2 (0), 60 kilograms of directing agent and 100 kilograms of concentrations are 5% by weight of sodium hydroxide solution. Raise the temperature to 95°C and stir at a constant temperature. After 8 hours, add 10 kg of solid silica gel (Qingdao Ocean Chemical Group Special Silica Gel Factory, Type A), and recrystallize for 12 hours. The stirring speed is 400 rpm during addition and crystallization. After the crystallization was completed, the crystallization tank was rapidly cooled, filtered, and washed with water until the pH value of the washing solution was less than 10. Drying at 120° C. for 2 hours obtained the zeolite material Y-1. Measure Y-1 by X-ray diffraction method, crystallinity of peak height method, K1 value of ratio of crystallinity of peak height method to crystallinity of peak ar...
preparation Embodiment 2
[0079] (1) According to the method of molecular sieve preparation embodiment 1 step (1), 100 kilograms of pulverized metakaolin powders were added with 380 kilograms of sodium silicate solution (containing 20.05% by weight of SiO 2 , 6.41 wt% Na 2 (0), 60 kilograms of directing agent, 100 kilograms of concentration is the sodium hydroxide solution of 5% by weight. Raise the temperature to 93°C and stir at a constant temperature. After 8 hours, add 15 kg of solid silica gel (Qingdao Ocean Chemical Group Special Silica Gel Factory, Type A), and recrystallize for 14 hours. The stirring speed is 400 rpm during addition and crystallization. After the crystallization is completed, the crystallization tank is rapidly cooled, filtered, and washed with water until the pH value of the washing liquid is less than 10. Drying at 120° C. for 2 hours yields the zeolite material Y-2. Measure Y-2 by X-ray diffraction method, crystallinity of peak height method, K1 value of the ratio of crysta...
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