Nitrate hydrogenation on Pt,In/Al2O3: EXAFS and XANES characterization

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

CATALYSIS COMMUNICATIONS

ELSEVIER SCIENCE BV

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. 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. 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. 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. 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. 2O3 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.