NEW INSIGHT ON COMPETITIVE REACTIONS DURING DEEP HDS OF FCC GASOLINE.

摘要

Air pollution is caused to large extent by gas emissions (NOx and SOx) from motor vehicles. Catalytic converters are poisoned by SOx and then can't eliminate NOx anymore. To address this environmental problem, drastic specifications for sulphur-containing gasoline have been imposed: quantity of sulphur in gasoline has to be lower than 10 wt ppm by the year 2009 in Europe. To satisfy these requests for high-purity products, refiners must remove sulphur compounds from gasoline, and that is essentially done by hydrodesulphurization (HDS)1. The largest part of sulphur in the gasoline pool comes from FCC gasoline. Therefore, this fraction has to be treated selectively to remove sulphur without hydrogenation (HYD) of olefins in order to maintain a hight octane number.