Super-stable Y-type molecular sieve containing phosphorus and rare earth, and preparation method thereof
A molecular sieve and rare earth technology, applied in molecular sieve catalysts, chemical instruments and methods, processing hydrocarbon oil, etc., can solve the problems of low crystallinity retention rate and specific surface area retention rate, low catalyst cracking activity, and low heavy oil cracking activity, etc. Achieve the effect of low coke selectivity, high stability and low content
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[0041] In one embodiment, the phosphorus modification treatment conditions are as follows: adding the Y-type molecular sieve powder sample with reduced unit cell constant to the exchange solution containing phosphorus compounds, and performing an exchange reaction at 15-100°C for 10-100 °C. Minutes, filter, wash; Wherein, the weight ratio of the water in the exchange liquid and molecular sieve is 2~5, preferably 3~4, phosphorus (in P 2 o 5 The weight ratio of the molecular sieve to the molecular sieve is: 0.0005~0.10, preferably 0.001~0.05.
[0042] In step (3), the calcined molecular sieve is also dried, so that the water content in the Y-type molecular sieve with reduced unit cell constant is preferably not more than 1% by weight. The drying can adopt existing methods, such as airflow drying, oven drying, and flash drying.
[0043] In the preparation method of modified Y-type molecular sieve provided by the present invention, in step (4), SiCl 4 : the weight ratio of Y ty...
Embodiment 1
[0056] Get 2000 grams of NaY molecular sieves (calculated on a dry basis) and add them to 20 liters of decationized aqueous solution and stir to make them evenly mixed. Add 600ml of RE(NO 3 ) 3 Solution (rare earth solution concentration is RE 2 o 3 Calculated as 319g / L), stirred, heated to 90-95°C and kept for 1 hour, then filtered, washed, and the filter cake was dried at 120°C to obtain a unit cell constant of 2.471nm and a sodium oxide content of 7.0% by weight. 2 o 3 A Y-type molecular sieve with a total rare earth content of 8.8% by weight is then calcined for 6 hours at a temperature of 390°C in an atmosphere containing 50% by volume of water vapor and 50% by volume of air to obtain a Y-type molecular sieve with a unit cell constant of 2.455nm. After cooling, Add molecular sieves to 6 liters of aqueous solution containing 35 grams of phosphoric acid, raise the temperature to 90°C, and perform phosphorus modification treatment for 30 minutes. After that, filter and wa...
Embodiment 2
[0059] Get 2000 grams of NaY molecular sieves (on a dry basis) and add them to 25 liters of decationized aqueous solution and stir to make them evenly mixed. Add 800 ml of RECl 3 solution (in RE 2 o 3 The calculated solution concentration is: 319g / L), stirred, heated up to 90-95°C for 1 hour, then filtered, washed, and the filter cake was dried at 120°C to obtain a unit cell constant of 2.471nm and a sodium oxide content of 5.5% by weight , with RE 2 o 3 A Y-type molecular sieve with a total rare earth content of 11.3% by weight was then calcined at a temperature of 450° C. under 80% water vapor for 5.5 hours to obtain a Y-type molecular sieve with a unit cell constant of 2.461 nm. After cooling, the molecular sieve was added to a solution containing 268 grams of In 6 liters of ammonium phosphate aqueous solution, the temperature was raised to 60°C, and the phosphorus modification treatment was carried out for 50 minutes. After that, the molecular sieve was filtered and was...
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