Selectivity Ring Opening Of Aromatics In Diesel

Selective ring opening reaction of aromatics was an effective way to enhance the cetane numbers of diesel. Y zeolites can be widely used in the catalytic cracking, hydrocracking and the ring opening of decalin for its adjustable acid and zeolite topology. In this work, palladium-platinum catalysts supported on Y zeolite were prepared by ion exchange method and the ring opening activity was investigated.A series of HY zeolites with varying degrees of ion exchanges was prepared to study the acid functions to the activity of selective ring opening and the products distribution. The catalysts were characterized by XRD, temperature programmed desorption of NH3. It was found that the acid site was the activity site of the ring opening of the decalin and more acid site can achieve higher activity. In addition, the acidity can also influence the distribution of the products. The cracking product can be achieved on the strong acid sites, while the ring opening and isomerization was obtained on the middle strong acid sites. In order to get high selectivity of the ring opening products, it was useless to increase the density of the acid sites.Palladium-platinum catalysts supported on NaY,NH4Y and HY were prepared by ion exchange method. XRD, NH3-TPD, AAS and CO chemisorption were employed to characterize the catalyst. It was shown that the acid amount of the support can influence the activity of the catalysts, while the moderate acid amount favored the selectivity ring opening reaction. The activity of the catalysts and the selectivity of the SRO were increased for the interaction between the metal and the acid sites. The process of the preparation can also influence the activity of the catalysts and the distribution of the products.