Nitrate hydrogenation on Pt,In/Al2O3. EXAFS and XANES characterization of fresh and used catalysts.

F.A. MARCHESINI; C.A.QUERINI; E.E.MIRO; F.G.REQUEJO; J.M. RAMALLO-LÓPEZ

CATALYSIS COMMUNICATIONS

Año: 2008 vol. 10 p. 355 - 358

1566-7367

Pt,In/Al2O3 catalysts were characterized by EXAFS and XANES. Among the catalysts studied, the one that contained 1 wt.% of Pt and 0.25 wt.% of In had a remarkable high initial activity which decreased with reaction time. EXAFS characterization showed that the fresh solid consisted of a mixture of bimetallic Pt,In particles and monometallic Pt ones. After reaction, the amount of bimetallic particles decreased and unalloyed Pt considerably increased, which led to a partial deactivation of the catalyst.