Catalytic cracking catalyst and preparation method thereof

Abstract

The invention provides a catalytic cracking catalyst and a preparation method thereof. The method comprises the steps of: (1) mixing a porous material with a water solution of an organic film forming matter at a first temperature, and then drying; and (2) mixing a molecular sieve, clay and binders with the mixture prepared in the step (1) at a second temperature, pulping the mixture, and then carrying out spray drying, washing and drying in sequence, wherein washing is carried out at the first temperature; the organic film forming matter is a film forming matter with solubility in water at the first temperature higher than that at the second temperature; and the porous material is porous alumina and / a porous silicon-aluminum material. The catalytic cracking catalyst not only has bigger mesopore volume but also maintains higher strength.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst, a preparation method of the catalytic cracking catalyst, and a catalytic cracking catalyst prepared by the method. Background technique [0002] Catalytic cracking is the core process device of gasoline and diesel production in my country. At present, more than 70% of gasoline and more than 30% of diesel in China come from catalytic cracking. Crude oil with carbon residue less than 10% by weight accounts for less than 30% of the world's crude oil reserves, and most of the world's oil reserves are low-quality crude oil with high carbon residue and heavy metal content. As my country's dependence on foreign oil continues to increase, the catalytic cracking process needs to further improve the cracking capacity of low-quality crude oil with high carbon residue and high heavy metal content. [0003] FCC catalysts include micropores, mesopores and macropores, among which, micropores are the pores in t...

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Problems solved by technology

[0009] In above-mentioned several methods, the problem that method (1) exists is: the pore diameter of the macroporous material that introduces is all greater than 3nm, and the particle (such as aluminum sol colloid) of the binder that uses in the catalyst preparation process is usually less than 3nm, thus The binder will be filled into the pores of the macroporous material, on the one hand, it will reduce the macropores, and on the other hand, the binder filled in the macropores will lose the ability to bind molecular sieves and other matrix materials, resulting in lower catalyst strength , so this method is difficult to industrialize; the problem that method (2) exists is: nanometer polymer is expensive, and its incineration can produce environmental protection problem; For method (3), although it can take into account mesopore volume and catalyst strength, However, it is difficult to control the process in the preparation process, and the adjustment range of the mesopore volume is limited, usually the total pore volume is between 0.20-0.26ml / g