USY molecular sieves are widely used in the petroleum refining industry, particularly in fluid catalytic cracking (FCC) processes. They enhance the conversion of heavy petroleum fractions into more valuable products like gasoline and diesel by providing high surface area and acidity, which promote cracking reactions. Additionally, they are employed in hydrocracking to improve the quality of fuels by removing impurities and increasing the yield of lighter hydrocarbons. In the petrochemical industry, these sieves are utilized for the alkylation and isomerization of hydrocarbons, contributing to the production of high-octane fuels and specialty chemicals. Their stability and selectivity also make them suitable for adsorption and separation processes, such as the removal of water and other contaminants from gases and liquids.