SYNTHESIS AND CATALYTIV PERFORMANCE OF NOVEL Ni SUPPORTED PERIODIC MESOPOROUS MCM-41 SILICA AND HEIRARCHIAL STRCUTURED BETA ZEOLITED FOR UPGRADING LIGHT CYCLE OIL VIA SELECTIVE RING OPENING; A) HYDROGENATION OF POLYNUCLEAR AROMATICS

摘要

Light cycle oil (LCO), which accounts for approximately 10 -20n% of FCC products, is a highly interesting blending stock to dieselnpool because of the boiling point range similarity. The majorndisadvantages of LCO, on the other hand, are primarily related to thenhigh content and the structural complexity of mainly bulky multiringnpolynuclear aromatics1. The current upgrading options (i.e.ndirect blending, catalytic saturation and hydrocracking) are notncapable of meeting the current fuel specifications, let alone those ofnthe future2. The blending option of LCO prior to upgrading wouldnadversely impact the diesel fuel, resulting in properties way farnfrom the imposed specifications. The conventional technologiesnhave reached their full potential and cannot meet the currentnstringent fuel specifications. Recently, selective r i n g op e n i n gn(SRO) a p p r o a c h has been proposed as an alternative2. Yet, none ofnthe studied SRO based catalysts (i.e. zeolites, ordered mesoporousnsilica) achieved the great potentials of SRO process, owing tonstructural instability, diffusion limitations, strong acidity and fastndeactivation