Abstract

ln this work, zinc alumínate (ZnAl7O4) spinel is used to support platínum-tin catalyst. Three different impregnaron procedures are followed: in the first catalyst is first impregnated with platinum and, then, with tin. In the second catalyst, the order of impregnation is the other way round. These samples are compared with a third solid obtained impregnating the ZnAl2O4 with a platinum and tin solution (simultaneous impregnation). In this study, the effect of these protocoles on the structure and on the catalytic performance (isobutane dehydrogenation) is discussed. The characterization techniques are atomic absorption, X-ray diffraction, hydrogen chemisorption and high resolution electrón microscopy