A. Caballero et al., CHARACTERIZATION BY IN-SITU EXAFS SPECTROSCOPY OF PT AL2O3 AND PTRE/AL2O3 CATALYSTS UNDER REACTION CONDITIONS/, JPN J A P 1, 32, 1993, pp. 439-441
The effects of the catalytic reforming of n-heptane on the metallic ph
ase of Pt/Al2O3 and PtRe/Al2O3 catalysis have been studied by EXAFS sp
ectroscopy. In both catalysts, a new platinum carbon bond is formed du
ring the catalytic reaction, coming from the deposition of carbonaceou
s residues over the metallic phase. However, in the case of the PtRe/A
l2O3 catalyst this bond is formed only at lower temperature and is acc
ompanied by important changes in the structure of the metallic particl
es. All these results are consistent with the existence of a PtRe inte
rmetallic phase in the bimetallic catalyst, which intercepts more effi
ciently the coke precursors.