In-situ EXAFS investigation of non-acidic CVD-based Pt/KL catalyst under oxidation-reduction cycles

Abstract

The structural evolution of non-acidic chemical-vapour deposition (CVD)-based Pt/KL catalyst has been investigated by in-situ extended X-ray absorption fine structure (EXAFS) spectroscopy. After in-situ reduction (H₂, 400 °C), EXAFS results suggested the presence of small metal particles which may be localized inside the KL-zeolite channels. After the reforming of methylcyclopentane at 500 °C (and 1 atm), no coke deposition was evidenced by EXAFS, in agreement with the non-acidic character of this catalyst.

Severe O₂/H₂ regeneration cycles did not alter the structure and location of Pt particles inside the zeolite.