DBT desulfurization pathways
Since there is currently little evidence for the potential for a commercially significant anaerobic desulfurization, aerobic biodesulfurization has been the focus of most research. The 4S pathway is a specific desulfurization pathway in which DBT is desulfurized and converted to 2-HBP (Fig. 2). Through this pathway the carbon skeleton of DBT is released intact and thus the calorific value of the fuel is not lost.
deep HDS is affected by components in the reaction mixture such as organic heterocompounds and polyaromatic hydrocarbons
Biocatalytic desulfurization (BDS)
BACKGROUND
Tontent for diesel in the USA is currently 15 p.p.m., with a target of 10 p.p.m. by 2010
Previous to 2003 the US EPA proposed that non-road diesel fuel sulfur be reduced from 3400 p.p.m. to 500 p.p.m. by 2007