Can I read PtSn/Al2O3 catalysts: Studies of the impregnation step on EtoBox?

PtSn/Al2O3 catalysts: Studies of the impregnation step by Graciela T. Baronetti; Sergio R. de Miguel; Osvaldo A. Scelza; Miguel A. Fritzler; Alberto A. Castro is a Materials Science article available to read on EtoBox.

What is PtSn/Al2O3 catalysts: Studies of the impregnation step about?

The impregnating solution (H2PtCl6 + SnC12 + 1 M HCl; Sn(II)/Pt(IV) molar ratio = 1.6)used to prepare Pt-Sri/A1203 catalysts was studied by uv-visible spectroscopy. Three different species were found in the above-mentioned solution: Pt(II), Sn(IV) and a Pt-Sn complex with the structure (PtC12(SnC13)2)\*-. Moreover, solutions with Sn(II)/Pt(IV) molar ratio of 1 and 3 were studied. The results indicate that the complex formation takes place only for solutions with Sn(II)/Pt(IV) molar ratio higher than 1. The Pt(0.3 wt%)-Sn(0.3 wt%)/A1203 catalyst precursors prepared by using three different deposition techniques: a) coimpregnation, b) two-step impregnation (Pt deposition, drying, Sn deposition) and c) two-step impregnation as in b) but in an inverse sequence of metal deposition, were characterized by diffuse reflectance spectroscopy and temperature programmed reduction. When the catal st is prepared using the deposition techniques named a or b, the (PtC12(SnC13)2) 3 -complex is adsorbed on the alumina surface maintaining its structure. But when the catalyst is prepared using the technique named c, the complex formation does not take place, and only Pt(IV) and Sn(IV) species are detec

Who reads PtSn/Al2O3 catalysts: Studies of the impregnation step?

Author

Graciela T. Baronetti; Sergio R. de Miguel; Osvaldo A. Scelza; Miguel A. Fritzler; Alberto A. Castro

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0166-9834)

Published

1985

Language

EN

Field

Materials Science (Physical Sciences)