Modified Y-type molecular sieve and preparation method thereof
A molecular sieve and modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low catalyst cracking activity, reduced zeolite selectivity, poor thermal and hydrothermal stability, etc., to achieve The effects of high LCO conversion efficiency, low coke selectivity, and high hydrothermal stability
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[0070] The preparation method of the present disclosure can prepare a high-silicon Y-type molecular sieve containing phosphorus, rare earth, gallium and zirconium with a certain secondary pore structure with high crystallinity, high thermal stability and high hydrothermal stability. The aluminum in the molecular sieve is evenly distributed, With less non-skeleton aluminum content, the modified Y-type molecular sieve is used for processing hydrogenated LCO and has high LCO conversion efficiency, low coke selectivity, higher gasoline yield rich in BTX aromatics, and high propylene yield.
[0071] In the preparation method of the modified Y-type molecular sieve provided by the present disclosure, in step (1), the NaY molecular sieve and the rare earth solution are subjected to an ion exchange reaction to obtain a Y-type molecular sieve with a conventional unit cell size containing rare earths with reduced sodium oxide content, and ion exchange The method of reaction can be known ...
Embodiment approach
[0079] 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 exchange reaction at 15-100°C for 10-100 minutes , filter, wash; Wherein, the weight ratio of the water in the exchange liquid and the molecular sieve is (2~5): 1, preferably (3~4): 1, phosphorus (in P 2 o 5 weight) to molecular sieve is (0.0005-0.10):1, preferably (0.001-0.05):1.
[0080] Further, in order to ensure the effect of gas phase ultrastable modification, molecular sieves can be dried before step (3), to reduce the water content in molecular sieves, so that in step (3) for use with SiCl 4 The moisture content of the contacted molecular sieves does not exceed 1% by weight. For example, in the embodiment where the phosphorus modification treatment is carried out before the gas phase ultrastable modification step, the phosphoru...
Embodiment 1
[0098] Get 2000gNaY molecular sieve (on a dry basis) and join in 20L decationized aqueous solution and stir to make it mix evenly, 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 1h, 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, expressed as RE 2 o 3 A Y-type molecular sieve with a rare earth content of 8.8% by weight is then calcined at a temperature of 390° C. in an atmosphere containing 50 volume percent water vapor and 50 volume percent air for 6 hours to obtain a Y-type molecular sieve with a unit cell constant of 2.455 nm. After cooling, the Molecular sieves were added to 6L solution in which 35g of phosphoric acid was dissolved, the temperature was raised to 90°C, and phosphorus modification treatment was carried out for 30 minutes. After that, the molecular sieves were ...
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