Purification of H2-rich streams by CO preferential oxidation over Pt nanoparticles supported on ordered porous silica

In this work, the performance of mesostructured Pt catalysts is studied for the preferential oxidation of CO in H-2-rich environments under a wide range of operating conditions. The catalysts were synthesized by incipient wetness impregnation and characterized by nitrogen sorptometry, transmission electron microscopy, X-ray diffraction, temperature-programmed reduction by hydrogen, H-2 chemisorption and inductively coupled plasma-atomic emission spectroscopy. The influence of Pt content, the presence of aluminium in the mesoporous structure, as well as different catalyst preteatments were studied. The samples showed promising results in terms of activity, selectivity and stability. Pt (1%)/Al-MCM-41 exhibits high activity for CO preferential oxidation at 120 degrees C, when pretreated with hydrogen and shows stability for 80 h on-stream, even when steam and CO2 is fed in the inlet stream.

Automated summary

The performance and stability of mesostructured Pt catalysts for the preferential oxidation of CO in H-2-rich environments were studied. Pt (1%)/Al-MCM-41 exhibited high activity and stability for CO preferential oxidation at 120 degrees C, even when exposed to steam and CO2.