SSZ-13 molecular sieve is widely used in the selective catalytic reduction (SCR) of nitrogen oxides (NOx) in diesel engines. Its unique structure allows it to effectively convert harmful NOx emissions into nitrogen and water, making it a key component in reducing air pollution from vehicles. Additionally, it is employed in gas separation processes, particularly for separating small molecules like carbon dioxide from gas mixtures, which is crucial in carbon capture and storage technologies. Its high thermal stability and acidity also make it suitable for various petrochemical applications, including hydrocarbon conversion and refining processes.