Abstract

MORALES, EDGAR MAURICIO; MORA, IVAN D.; GIRALDO, SONIA A.  and  CENTENO, ARISTÓBULO. EFFECT OF THE PRESENCE OF CHLORINE IN Pd/γ-Al2O3 CATALYSTS ON THE DIBENZOTIOPHENE HYDRODESULFURIZATION REACTION. Rev. ion [online]. 2011, vol.24, n.1, pp.53-60. ISSN 0120-100X.

In this work, the influence of chlorine in Pd/γ-Al₂O₃ catalysts was studied, in order to understand the reason of the improvement in the conversion observed in the hydrodesulfurization (HDS) of dibenzotiophene (DBT), when these catalysts are prepared from chlorided precursors compared to those prepared from acetylacetonates. In order to achieve this objective, the effect of the incorporation of Cl before and after the Pd salt, and the effect of changing catalysts calcinations and reduction temperatures was analyzed. The acid-base properties of the catalyst were determined using the Proton Affinity Distribution method, which allowed correlating the nature and concentration of the different OH sites present in the catalyst's surface with the catalytic behavior. The results showed that the presence of Cl in the catalyst generates changes in the acid properties of the support, possibly creating new acid Brönsted sites, presenting a positive effect in the HDS of the DBT. It was also was observed a very important increase in the selectivity to HYD when the catalysts containing chlorine were activated at low temperature (473 K).

Keywords : impregnation order; reduction temperature; calcination temperature; hydrogenation.

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