Catalytic cracking catalyst and preparation method thereof

Abstract

The invention provides a catalytic cracking catalyst and a preparation method thereof, wherein the catalyst comprises 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y type molecular sieve and a phosphorus-containing and supported-metal-containing MFI-structure molecular sieve, wherein the n(SiO2) / n(Al2O3) of the phosphorus-containing and supported-metal-containing MFI-structure molecular sieve is more than 18 and less than 70, the Al distribution parameter D is more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores accounts for 50-80% of the total pore volume, the volume of the mesopores with the pore size of 2-20 nm accounts for more than 85% of the total mesopore volume, the amount of the strong acid accounts for 50-80% of the total acidamount, a ratio of the acid B to the acid L is 7-30, the phosphorus content is 1-15 wt%, and the supported metal content is 0.1-5 wt%. The preparation method comprises: carrying out mixing beating onthe phosphorus-containing and supported-metal-containing MFI-structure molecular sieve, the Y type molecular sieve, the natural minerals and an inorganic oxide binder, and carrying out spray drying.According to the present invention, the catalytic cracking catalyst has the high low-carbon olefin yield in the catalytic cracking of petroleum hydrocarbons.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst and a preparation method thereof Background technique [0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resin, synthetic fiber and synthetic rubber, among which propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking to produce ethylene. Liquid-based ethylene plants usually produce about 15% of propylene, providing about 70% of the propylene consumed by the petrochemical industry, while the second largest source of propylene is almost all from FCC units, providing about 30% of demand, In the United States, FCC units provide about half of petrochemicals' propylene demand. [0003] Due to the rapidly growing demand for polypropylene, the demand for propylene in the petrochemical ...

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Problems solved by technology

Therefore, it has limited effect on maintaining good shape selectivity after ZSM-5 molecular sieve expansion.

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