Unexpected role of NOx during catalytic ozone abatement at low temperature

Abstract

The catalytic decomposition of ozone was carried out at 40 °C with a Pd/Al2O3 catalyst, in the presence or absence of nitrogen oxides traces. NOx were produced during the generation of ozone from air. Two set-ups were used to examine the possible effects of NOx poisoning, one fixed bed with a powder catalyst, and another using a monolith coated with the same catalyst. NOx were shown to significantly poison the catalyst, resulting in a decrease of ozone conversion over time on stream. NOx-free ozone feed can lead to the total recovery of the initial catalyst properties indicating a reversible poisoning.

Keywords

• Ozone conversion
• NOx poisoning
• PdO catalyst
• Air treatment
• Adsorption