Modification method for improving catalytic activity of Y-type molecular sieve

Abstract

The invention provides a modification method for improving the catalytic activity of a Y-type molecular sieve. The modification method comprises the following steps: adding a phosphorus-containing compound into Y-type molecular sieve slurry and mixing and pulping; carrying out refining treatment; then adjusting the pH (Potential of Hydrogen) value of the slurry and raising the temperature and reacting; finally, adding a magnesium-containing compound into the mixed slurry, and mixing and pulping; raising the temperature and exchanging to obtain the modified Y-type molecular sieve. By adopting the modification method, the catalytic activity and a pore structure of the molecular sieve can be remarkably improved and the process only needs a two-step exchange technology; high-temperature roasting is not needed; a modification process is simple and industrial production is easy to realize.

Description

technical field [0001] The invention relates to a modification method of a Y-type molecular sieve, and more specifically relates to a modification method for improving the catalytic activity of a Y-type molecular sieve. Background technique [0002] Fluid catalytic cracking technology (FCC) has become an important means of secondary processing of heavy oil due to its relatively low investment, strong feedstock adaptability, and simple operation. During the catalytic cracking process, the catalytic activity of the Y-type molecular sieve in the catalyst is likely to decrease, resulting in a decrease in the processing capacity of the device and a deterioration in product distribution. In order to maintain the catalytic activity of the balancer, the refinery maintains the conversion rate of the unit by increasing the unit consumption of fresh catalyst, resulting in an increase in the processing cost of the unit. [0003] In order to improve the catalytic activity of Y-type mole...

AI Technical Summary

Problems solved by technology

However, in this patent, rare earth compounds and phosphorus compounds are added in the molecular sieve modification process, which is easy to form precipitates and deposit on the outer surface of the molecular sieve and block the pores of the molecular sieve, which is not conducive to the cracking of oil and gas molecules by the acid centers in the pores, and affects the catalytic activity of the molecular sieve.

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