Low Temperature Catalytic Oxidation of Ethanol Using Ozone over Manganese Oxide‐Based Catalysts in Powdered and Monolithic Forms

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Abstract

Catalytic oxidation of low concentrations of ethanol was investigated in dry and humid air streams at low temperature (60 °C) over manganese oxide‐based catalysts supported on a meso– macrostructured TiO2 using ozone as the oxidant. Ethanol was selected as a representative model VOC present in indoor air, and its concentration was fixed to 10 ppm. For that purpose, a series of Mn/TiO2 powder and monolithic catalysts was prepared, some doped with 0.5 wt% Pd. Whatever the catalyst, the presence of water vapor in the gas phase had a beneficial effect on the conversion of ethanol and ozone. The Pd–Mn/TiO2 catalyst containing 0.5 wt% Pd and 5 wt% Mn exhibited superior oxidation efficiency to the Mn/TiO2 counterparts by increasing ozone decomposition (77%) while simultaneously increasing the selectivity to CO2 (85%). The selectivity to CO2 approached nearly 100% by increasing the amount of catalyst from 20 to 80 mg. In a further step, alumina wash-coated cordierite honeycomb monoliths were coated with the 0.5Pd–5Mn/TiO2 catalyst. Full conversion of ethanol to CO2 without residual O3 emitted (less than 10 ppb) could be attained, thereby demonstrating that the proposed Pd–Mn/TiO2 monolithic catalyst fulfills the specifications required for onboard systems.

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Touati, H., Valange, S., Reinholdt, M., Batiot‐dupeyrat, C., Clacens, J. M., & Tatibouët, J. M. (2022). Low Temperature Catalytic Oxidation of Ethanol Using Ozone over Manganese Oxide‐Based Catalysts in Powdered and Monolithic Forms. Catalysts, 12(2). https://doi.org/10.3390/catal12020172

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