DEVELOPMENT OF A COSMO DEEP HDS CATALYST FOR DIESEL FUEL

A new type of catalyst for deep hydrodesulfurization (HDS) has been de veloped. This catalyst was effective for removal of refractory sulfur compounds such as 4,6-dimethyldibenzothiophene. The addition of a smal l amount of zeolite which had well-controlled acidity has afforded a c haracteristic performance to deep HDS. We think that the zeolite added accelerates the hydrogenation rate of the dibenzothiophene ring. The developed catalyst has been manufactured on an industrial scale withou t any problems. The catalyst was loaded on an actual HDS unit as a dem onstration run. The expected performance and stability have been obtai ned.