Catalytic cracking catalyst, preparation method and applications thereof
A catalytic cracking and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of small unit cell constant, poor accessibility of active centers, low activity, etc.
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[0085] The preparation method of the catalyst described in the present disclosure can refer to existing methods, for example, according to the methods disclosed in patents CN1098130A and CN1362472A. Typically comprising the steps of forming a slurry comprising modified Y molecular sieve, binder, clay and water, spray drying, optionally washing and drying. Spray drying, washing, and drying are prior art, and there is no special requirement in this disclosure.
[0086] The second aspect of the present disclosure provides a method for preparing the catalytic cracking catalyst described in the first aspect of the present disclosure. The method includes: preparing a modified Y-type molecular sieve, forming a modified Y-type molecular sieve comprising the modified Y-type molecular sieve, alumina binder, clay and water slurry, and spray drying to obtain the catalytic cracking catalyst;
[0087] Wherein, the preparation of modified Y-type molecular sieve comprises the following steps...
Embodiment approach
[0106] In one embodiment, the phosphorus modification treatment conditions are as follows: adding the acid-treated molecular sieve sample into the exchange solution containing phosphorus compounds, performing exchange reaction at 15-100°C for 10-100 minutes, filtering and washing 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 (0.001-0.06):1.
[0107] In the preparation method of catalytic cracking catalyst provided by the present disclosure, the phosphorus-modified molecular sieve can be contacted with a solution containing active elements, and then exchanged and / or impregnated to load the active elements on the modified Y-type molecular sieve. In order to improve the effect of exchange and / or immersion treatment, the solution containing active elements is preferably an aqueous solution of gallium salt or boron compound or a...
specific Embodiment approach
[0128] In a third specific embodiment of the present disclosure, the method for preparing a modified Y-type molecular sieve comprises the following steps:
[0129] (1) Perform ion exchange reaction between NaY molecular sieve (also known as NaY zeolite) and rare earth solution, filter and wash to obtain ion exchanged molecular sieve, which has reduced sodium oxide content, contains rare earth elements and has conventional crystal cell size; the ion exchange is usually exchanged for 30 to 120 minutes under conditions of stirring and a temperature of 15 to 95° C., preferably 65 to 95° C.;
[0130] (2) Calcining the ion-exchanged molecular sieve at a temperature of 350 to 480°C in an atmosphere containing 30 to 90% by volume of water vapor for 4.5 to 7 hours, and drying to obtain a mild hydrothermal superstable product with a water content of less than 1% by weight. Modified molecular sieve; the unit cell constant of the mildly hydrothermally ultrastable modified molecular sieve ...
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