Abstract
Activity for the hydrodenitrogenation (HDN) of quinoline has been studied at an overall pressure of 7 MPa in the temperature range 623–698 K, on a series of doubly promoted ZnCoMo catalysts supported on fluorinated alumina (0.0–2.0 wt% F). For the F free catalysts the partial substitution of Co by Zn does not affect HDN activity. However, for the fluorinated catalyst series, the HDN activity was found to increase slightly for fluorine contents around 1.0–1.3 wt% F. Simultaneously, a minimum in hydrogenation activity to N free products was observed. These results have been explained in terms of two antagonistic effects. While fluorine favours multilayered MoO 3 crystallites, with shorter dimensions in the lateral direction caused by disruption in the geometry, cobalt has a propensity to intercalate at the edges of the crystals, thus inhibiting the formation of stacks in which the reduced sites, believed to be needed for HDN and hydrogenation, are located.
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