HYDROGEN INTERACTIONS AND CATALYTIC PROPERTIES OF PLATINUM-TIN SUPPORTED ON ZINC ALUMINATE

Authors
AGUILARRIOS G VALENZUELA M SALAS P ARMENDARIZ H BOSCH P DELTORO G SILVA R BERTIN V CASTILLO S RAMIREZSOLIS A SCHIFTER I
Citation
G. Aguilarrios et al., HYDROGEN INTERACTIONS AND CATALYTIC PROPERTIES OF PLATINUM-TIN SUPPORTED ON ZINC ALUMINATE, Applied catalysis. A, General, 127(1-2), 1995, pp. 65-75
Citations number
44
Categorie Soggetti
Chemistry Physical","Environmental Sciences
Journal title
Applied catalysis. A, General → ACNP
ISSN journal
0926860X
Volume
127
Issue
1-2
Year of publication
1995
Pages
65 - 75
Database
ISI
SICI code
0926-860X(1995)127:1-2<65:HIACPO>2.0.ZU;2-Z
Abstract
Pt-Sn/ZnAl2O4 catalysts prepared by two-step impregnation (first tin), with a Sn/Pt atomic ratio ranging from zero to 6.72, were characteriz ed by hydrogen chemisorption, temperature-programmed reduction and tes ted in isobutane dehydrogenation. Metal dispersion correlates linearly with reaction rate; both parameters reach a maximum when the Sn/Pt at omic ratio is about one. The activity of the sites capable of hydrogen chemisorption, as expressed in turnover frequency number, TOF, decrea se as the tin concentration is increased. From theoretical ab-inito ca lculations, it is proposed that tin reduces the platinum-hydro en char ge transfer responsible for hydrogen dissociation through an orbital o verlapping.