Catalytic cracking catalyst and preparation method thereof
A catalytic cracking and catalyst technology, applied in catalytic cracking, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of rare earth loss and rare earth utilization rate reduction, and achieve high crystallization retention, high rare earth utilization rate, and precise control Effect
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Embodiment 5、6 and 8
[0029] The second Y-type molecular sieve is a gas-phase ultra-stable Y-type molecular sieve containing rare earths, and its preparation method includes: contacting the Y-type molecular sieves containing rare earths with silicon tetrachloride under stirring, and the contact temperature is 100-500 ° C, The contact time is 0.1-10 hours, and the weight ratio of the rare earth-containing Y-type molecular sieve to silicon tetrachloride is 1:0.05-0.5. The specific preparation method of the second gas-phase ultra-stable Y-type molecular sieve can refer to the patent application CN1683244A, especially the examples 5, 6 and 8;
[0030] In the present invention, the third Y-type molecular sieve is a rare earth-containing DASY molecular sieve, and the rare earth-containing DASY molecular sieve is a rare earth-containing hydrothermal ultrastable molecular sieve, wherein RE 2 o 3 The rare earth content in terms of (rare earth oxide) is preferably 1.5 to 3.0% by weight. The rare earth-cont...
Embodiment 1
[0054](1) Preparation of rare earth Y-type molecular sieve
[0055] Take 2.6 kg of NaY molecular sieve (Qilu Catalyst Factory, ignited 22.5% by weight, silicon-aluminum ratio 2.7, crystallinity 88%, the same below) and 15 kg of deionized water to mix and beat, add 1.0 liter concentration of 160gRE 2 o 3 / L of rare earth chloride solution and 0.24 kg of ammonium chloride solid, stir well, raise the temperature to 70°C and adjust the pH of the slurry to 4.0 with dilute hydrochloric acid, continue to exchange for 1.5 hours, filter, wash with water, and dry, under the condition of 100% water vapor Calcined at 550°C for 2 hours to obtain cross-calcined rare earth sodium Y molecular sieve Y-A1. The chemical composition of Y-A1 is 5.1% by weight of sodium oxide and 7.8% by weight of rare earth oxide. Then by molecular sieve: NH 4 Cl:H 2 The ratio of O=1:0.2:10 is beaten and exchanged at 70°C for 1 hour. After filtering and washing, re-beating and adding 0.27 liters of concentratio...
Embodiment 2
[0060] The pseudo-boehmite of 20 weight parts on a dry basis is mixed with deionized water for beating, and adding concentration to the obtained slurry is 36% by weight hydrochloric acid peptization, the acid-aluminum ratio (the 36% by weight hydrochloric acid and The weight ratio of pseudo-boehmite on a dry basis) is 0.20, the temperature is raised to 65°C for acidification for 1 hour, and 39 parts by weight of kaolin slurry on a dry basis and 9 parts by weight of aluminum sol on a dry basis are added , stirred for 20 minutes, then added 15 parts by weight of rare earth Y-type molecular sieve Y-A in dry basis and the second Y-type molecular sieve of 15 parts by weight in dry basis and DASY2.0 in 2 parts by weight in dry basis The slurry was mixed with molecular sieves, stirred for 30 minutes to obtain a slurry with a solid content of 30% by weight, and spray-dried to make a microsphere catalyst. The microsphere catalyst was calcined at 500°C for 1 hour, and then heated at 60°...
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