Regulación de la función ácida en catalizadores de WZ promovidos con Pt y Pd para reacciones de isomerización-craqueo de parafinas pesadas

M. BUSTO; V.M. BENÍTEZ; C.R. VERA; C.L. PIECK; J.M. GRAU; J.C. YORI

La Plata , Argentina

Congreso; XV Congreso Argentino de Catálisis - 4° Congreso de Catálisis del Mercosur; 2007

Universidad Nacional de La Plata

The objective of this work was to optimize the acid function of a Pt-Pd/WO3-ZrO2 catalyst. The calcination temperature and the W content were the preparation variables studied. The thus prepared catalysts were tested in the reaction of n-decane isomerization-cracking. The focus of the optimization was put on the synthesis of a catalyst with a good isomerizing activity and a minimum activity for the formation of light gases. In this way an isomerizate of high octane number and high liquid yield can be obtained and used for blending into the gasoline pool. The catalysts were further characterized by adsorption of nitrogen and temperature programmed desorption of probe molecules (TPD). Varying both the W content and the calcination temperature enables the regulation of the properties of the acid function. In this way both the activity and selectivity can be fine-tuned. The highest activity is obtained with the samples calcined at 700 °C with a 15% of W. The samples calcined at 700 °C are also the most stable ones, i.e. the activity of the acid function is less affected by coking. All the prepared catalysts produced a high octane number gain (relative to the octane number of the feed) that is between 75-95 points and acceptable yields of light gases (< 10%).