Cracking catalyst capable of increasing octane number of catalytic cracking gasoline

Abstract

The invention discloses a cracking catalyst capable of increasing the octane number of catalytic cracking gasoline. The cracking catalyst is characterized by comprising, by dry weight, taking the catalyst as 100%: 10-50% of rare-earth ultrastable Y-type molecular sieves, 20-50% of clay, 5-35% of a binder, 0-10% of shape-selective molecular sieves with an MFI structure, and 0-20% of REY and / or other REUSY molecular sieves. The content of rare earth in the catalyst is 1.0-4.0% by weight. The rare-earth ultrastable Y-type molecular sieves are obtained by the steps that: a fresh NaY molecular sieve crystallization slurry is subjected to filtration and separation, and a molecular sieve filter cake is washed with lye; the molecular sieve filter cake is subjected to beating; and through ion exchange of rare earth and ion exchange of ammonium salts, the rare-earth ultrastable Y-type molecular sieves are obtained. The catalyst is capable of significantly increasing the octane number of gasoline, and has good coke selectivity and excellent heavy oil conversion capability.

Description

technical field [0001] The present invention relates to a catalytic cracking catalyst, more specifically to a catalytic cracking catalyst for increasing the octane number of catalytic cracking gasoline. Background technique [0002] The octane number is an important indicator of the anti-knock performance of carburetor engine fuel, and it is listed as the first item in the specifications of motor gasoline. The higher the octane number of gasoline, the better the anti-knock performance, and the engine can use a higher compression ratio. The compression ratio of a car engine is directly related to gasoline consumption and fuel economy. Increasing the compression ratio by one unit can improve fuel economy by 4% to 12%; increasing the octane number of gasoline by one unit can reduce fuel consumption by 0.7% to 3.1%. . For the normal operation of high compression ratio automobile engines and the increasingly stringent environmental protection regulations, gasoline with high oct...

AI Technical Summary

Problems solved by technology

[0011] From the perspective of the prior art, since the NaY molecular sieve crystallization slurry prepared by the hydrothermal method contains a large amount of unreacted amorphous colloids, the colloids cannot be effectively removed in the subsequent separation process, resulting in low crystallinity of the prepared NaY molecular sieves. Poor stability and dispersibility

In the existing molecular sieve exchange process, there is a competitive exchange between rare earth ions and ammonium ions, the utilization efficiency of rare earth ions is low, the crystallinity of molecular sieves is low, and the retention rate is poor

At the same time, the existing Y-type molecular sieves are complex in preparation process and high in cost, and are mostly synthesized from environmentally polluting raw materials, which have adverse effects on the environment and human body, and the existing methods do not have the function of improving the dispersion of molecular sieves

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