Heavy oil catalytic cracking catalyst and preparation method thereof

Abstract

The invention relates to a heavy oil catalytic cracking catalyst and preparation method thereof, which is characterized by that a microporous molecular sieve is taken as a main active component, modified dielectric-microporous molecular sieve is taken as an assistant active component, the microporous molecular sieve content is between 10 and 40%, the modified dielectric-microporous molecular sieve content is between 1-40%, the binder content is between 1 and 30% and the clay content is between 30 and 80%. Compared with a single USY molecular sieve catalyst, the catalyst of the invention enables reduced heavy oil yield, increased light oil yield and decreased coke yield, the catalyst has a practical industrial application prospect. Compared with a catalyst prepared by the dielectric-microporous molecular sieve-substituted USY molecular sieve, the heavy oil yield is reduced, the light oil yield is increased and the coke yield is decreased.

Description

technical field [0001] The invention relates to a heavy oil catalytic cracking catalyst and a preparation method, in particular to a catalyst containing mesoporous molecular sieves and a preparation method. Background technique [0002] Feedstocks for catalytic cracking (FCC) are becoming increasingly heavy. Heavy oil is characterized by large molecules and complex molecular structures. Therefore, catalysts are required to have a gradient distribution of pore structures so that heavy oil macromolecules can be cracked in a "relay race". [0003] At present, FCC catalysts are mostly composed of Y-type molecular sieves and kaolin. Y-type molecular sieves have strong acidity and a supercage structure with large cavities, which play an important role in catalytic cracking. However, due to the limitation of pore size, Y-type molecular sieves are not ideal for the conversion of heavy oil macromolecules. Adding molecular sieves with macropores and mesoporous structures to Y-type mol...

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Problems solved by technology

[0006] CN1354224A has prepared a kind of catalyst that improves olefin productive rate, and the composition of catalyst is 0~70% clay, the mixture of 5~90% inorganic oxide and 1~50% beta molecular sieve or mordenite, the shortcoming of this catalyst is a low liquid yield

[0013] CN1211608A discloses a layered clay microsphere heavy oil cracking catalyst used for prolific diesel and gasoline, the catalyst consists of 20-90% layered clay, 10-40% binder, 0-40% Y-type Molecular sieve and 0-70% kaolin clay, when the catalyst is used for heavy oil cracking, the total yield of gasoline, diesel and liquefied gas is not high

The catalyst has poor anti-heavy metal pollution performance

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