The requirements of ultra-clean fuels together with the depletion of the standard sources of fuels are forcing refiners to intensify the two mayor conversion units (catalytic cracking and hydroprocessing) to upgrade sulfur- and aromatic-rich feeds [1,2]. Among these feeds the Light Cycle Oil (LCO, by-product of the catalytic cracking) has very poor properties to be used as blending of diesel, as it has ca. 2 wt% of sulfur and 70 wt% of aromatics. One upgrading solution is to feed LCO to the hydroprocessing unit, however the presence of LCO lead to a rapid deactivation of the state-of-the-art catalyst, this is due to sulfur and nitrogen poisoning as well as coke fouling. We have studied the deactivation behaviour of bifunctional catalysts (Pt-Pd/zeolite) on the hydroprocessing of LCO. Firstly, the properties of the spent catalysts have been compared to these of the fresh ones to study the deterioration of the properties of the catalyst. Secondly, we have studied the properties of the coke. The aim is to gain insight of the mechanisms of deactivation of Pt-Pd/zeolite catalysts.
|Original language||English (US)|
|Title of host publication||ACS National Meeting Book of Abstracts|
|State||Published - Aug 25 2011|