Development of a Sustainable Heterogeneous Catalyst Based on an Open-Cell Glass Foam Support: Application in Gas-Phase Ozone Decomposition
Abstract
Heterogeneous catalysts were synthesized with a glass foam support mainly composed of recycled glass and impregnated with zerovalent ruthenium nanoparticles (aiming to 0.1 wt % ruthenium). Different glass foams were developed, playing on the nature and quantity of foaming/doping agents, as well as the operating conditions (heat temperature and time of heating). They were characterized in terms of open porosity, pore diameter, wettability, and pressure drops. High open porosity can be achieved (between 73% and 92%) with mean pore diameter up to 0.55 mm, resulting in the lowest pressure drops measured among all glass foams. The deposit of zerovalent ruthenium nanoparticles was confirmed by transmission electron microscopy images and changes in surface charge showed by zeta potential determination. Finally, the removal of ozone from air at room temperature and inlet concentration of 9 g Nm(-3) was performed to prove the catalyst activity. Up to 52% of ozone decomposition was achieved in less than 13 s of residence time. The activity did not seem to be linked with the characteristics (open porosity and mean pore size) of the glass foams, but it was shown that the external mass transfer was still limiting the process performances in the range of superficial gas velocity tested (4 mm s(-1) to 11 mm s(-1)).
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