TY - JOUR
T1 - Hydrogen interactions and catalytic properties of platinum-tin supported on zinc aluminate
AU - Aguilar-Ríos, G.
AU - Valenzuela, M.
AU - Salas, P.
AU - Armendáriz, H.
AU - Bosch, P.
AU - Del Toro, G.
AU - Silva, R.
AU - Bertín, V.
AU - Castillo, S.
AU - Ramírez-Solís, A.
AU - Schifter, I.
PY - 1995/6/22
Y1 - 1995/6/22
N2 - Pt-Sn/ZnAl2O4 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.
AB - Pt-Sn/ZnAl2O4 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.
KW - Dehydrogenation
KW - Platinum-tin
KW - Zinc aluminate spinel
UR - http://www.scopus.com/inward/record.url?scp=58149212914&partnerID=8YFLogxK
U2 - 10.1016/0926-860X(95)00269-3
DO - 10.1016/0926-860X(95)00269-3
M3 - Artículo
SN - 0926-860X
VL - 127
SP - 65
EP - 75
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1-2
ER -