New insight on competitive reactions during deep HDS of FCC gasoline

FUEL 193

Noëmie Dos Santos, noemie.dos-santos@ifp.fr1, Michel Vrinat, michel.vrinat@ircelyon.univ-lyon1.fr2, Hugues Dulot, hugues.dulot@ifp.fr1, and Nathalie Marchal1. (1) Process Development and Engineering Division, IFP LYON, PO Box 3, Vernaison, 69390, France, (2) IRCELYON, UMR 5256 CNRS / Université Lyon1, 2 Av. Albert Einstein, 69626 Villeurbanne Cedex, France
In order to satisfy requests for high purity fuel, sulphur compounds have to be removed selectively from FCC gasoline without hydrogenate olefins (which contribute to octane number) and without recombinate olefins and H2S (product of hydrodesulphurization) to form thiols. Competition between hydrodesulphurization (HDS) and hydrogenation of olefin (HYD) is truly a non-trivial subject. In this study, impact of H2S on reactivity and selectivity has been studied for model compounds (3-methylthiophene and 1-hexene in heptane) under operating conditions allowing kinetics studies. Formation of C6-thiols appears to be under thermodynamic control. Action of inhibition of H2S on HDS and HYD reactions has been shown. Moreover, inhibiting action of olefins on HDS and 3MT on hydrogenation have been observed. This competition between HYD and HD could be an argument in favour of the existence of a single type of active site on hydrotreating catalyst.
 

Ultraclean Transportation Fuels
8:25 AM-12:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 238, Oral

Division of Fuel Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008