INFLUENCE OF THE FINAL CONTENT OF CHLORINE ON THE BEHAVIOUR OF SUPPORTED MULTIMETALLIC CATALYSTS FOR N-BUTANE DEHYDROGENATION.

ADRIANA D. BALLARINI; VIRGINIA I. RODRÍGUEZ; PATRICIA D. ZGOLICZ; SERGIO R. DE MIGUEL; DEFINA A. LUCK; JUAN C. GONZALEZ; ALBERTO CASTRO; OSVALDO A. SCELZA

Beijing

Conferencia; Sinopec International Technical Conference on Refinery Catalyst (SITCRC); 2008

      In this work, the influence of the final content of chlorine on the behavior of PtSnIn catalysts supported on different commercial aluminas (NORPRO, AXENS 505, and ALCOA) is analyzed. These catalysts were prepared with a preparation method that takes into account the HCl concentration during the Pt impregnation, the inclusion or not of an intermediate calcination step before the In deposition, and the regulation of the chlorine content (through the oxicloration treatments) to reach final chlorine content values similar to that of the commercial catalyst. The performance of these PtSnIn catalysts supported on the three supports and the commercial catalyst was studied in the selective dehydrogenation reaction of n-butane to butanes. The influences of the chlorine content both on the initial and final butane conversions and on the initial and final dehydrogenation selectivity of the different catalysts were also analyzed. It has been possible to obtain catalysts with good catalytic behaviors and low coke formations along the reaction time. Results show that there is a positive effect of the chlorine content on the initial n-butane conversion, however there is a negative effect on the dehydrogenation selectivity to butenes.