USY molecular sieve is widely used in the petrochemical industry, particularly in fluid catalytic cracking (FCC) processes. It enhances 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, it is employed in hydrocracking and isomerization processes to improve the quality and yield of fuels. In environmental applications, it is used to remove nitrogen oxides (NOx) from exhaust gases, contributing to air pollution control. Its stability and selectivity also make it suitable for adsorption and separation processes in various industrial applications.