Abstract :
[en] The present work reports the impregnation of palladium (Pd) or platinum (Pt) on hierarchical porous zeolite
catalysts for Volatile Organic Compounds (VOCs) oxidation. The hierarchical porous zeolite (NaYmod) was
synthesized via a top-down approach to incorporate mesoporosity into the microporous zeolite NaY. This process
was achieved through a three steps synthesis: dealumination, desilication and alkaline treatment. 0.5 wt% of Pd
and Pt precursors were then added to NaY and NaYmod supports by wet impregnation in order to elaborate
efficient catalysts for the total oxidation of two types of VOCs, ethanol and toluene, which are probe molecules
for oxygenated VOCs and BTEX compounds respectively. The supported and unsupported samples were char-
acterized by X-Ray Diffraction (XRD), N2-physisorption, Transmission Electron Microscopy (TEM), and X-Ray
Photoelectron Spectroscopy (XPS). The modified mesostructured support ensures a better dispersion of the active
phases and led to a partial presence of highly reactive Pt(II) species in the case of platinum-based samples.
Whatever the oxidation reaction, these latter demonstrate higher conversions compared to palladium-based ones.
The presence of Pt(II) species provided a high catalytic performance, with a total degradation of both VOC probe
molecules at temperatures lower than 170 ◦ C. Such temperatures have not been recorded before for NaY sup-
ported materials.
Name of the research project :
3145 - DepollutAir - Couplages innovants de techniques de traitement des Composés Organiques Volatils - Sources publiques européennes
Funding text :
The “DepollutAir” project (grant number 1.1.18) of the European
Program INTERREG V France-Wallonie-Vlaanderen (European Regional
Development Fund (ERDF), Europe), R ́egion Wallone (Belgium) and
R ́egion Hauts-de-France (France) are acknowledged for the funding and
their support for this work.
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