Hydrogen interactions and catalytic properties of platinum-tin supported on zinc aluminate

✍ Scribed by G. Aguilar-Ríos; M. Valenzuela; P. Salas; H. Armendáriz; P. Bosch; G. Del Toro; R. Silva; V. Bertín; S. Castillo; A. Ramírez-Solís; I. Schifter

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 572 KB
• Volume: 127
• Category: Article
• ISSN: 0926-860X
• DOI: 10.1016/0926-860x(95)00269-3

✦ Synopsis

Pt-Sn/ZnA1204 catalysts prepared by two-step impregnation (first tin), with a Sn/Pt atomic ratio ranging from zero to 6.72, were characterized by hydrogen chemisorption, temperature-programmed reduction and tested in isobutane dehydrogenation. Metal dispersion correlates linearly with reaction rate; both parameters reach a maximum when the Sn/Pt atomic ratio is about one. The activity of the sites capable of hydrogen chemisorption, as expressed in turnover frequency number, TOF, decrease as the tin concentration is increased. From theoretical ab-inito calculations, it is proposed that tin reduces the platinum-hydrogen charge transfer responsible for hydrogen dissociation through an orbital overlapping.