(600af) Catalytic Cracking of C5 Raffinates Over Modified ZSM-5 Zeolite

Catalytic processes for producing light olefins from low value refinery streams such as C5 raffinates are an attractive method for higher value added products in the petrochemical industry. In this work, catalytic cracking of C5 raffinates for ethylene and propylene production, over modified ZSM-5 catalysts were investigated. Metal modified mesoporous ZSM-5 catalysts with different metal cation and carbon template loading were prepared by a hydrothermal synthesis method used in light olefin production by catalytic cracking of C5 raffinates. Various experimental measurements such as NH₃-TPD (Temperature-Programmed Desorption), XRD(X-Ray Diffraction), Nitrogen Absorption-Desorption, SEM (Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy), and CHONS analysis were carried out to elucidate the different catalytic performance of metal modified mesoporous ZSM-5 catalysts. It was found that the light olefin yield over carbon templated ZSM-5 catalysts increased with increasing the carbon content until 30 wt%. It was also observed that the introduction of different metal cation into mesoporous ZSM-5 controlled the acid property and improved the structural stability, resulting in an enhancement of the deactivation of catalyst. The reason for improvement of catalytic stability and the effect of the carbon template on catalytic performance will be discussed. (This work was supported by the Industrial Strategic Technology Development Program (10035187, Upgrade of petrochemical by-products using green process) funded by the Ministry of Knowledge Economy (MKE, Korea).)