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Volume 12
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10.3390/catal12020172
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Article

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

by
Houcine Touati
,
Sabine Valange
*,
Marc Reinholdt
,
Catherine Batiot-Dupeyrat
*,
Jean-Marc Clacens
* and
Jean-Michel Tatibouët
Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), UMR CNRS 7285, Université de Poitiers, ENSI Poitiers, 1 Rue Marcel Doré, TSA 41105, CEDEX 9, 86073 Poitiers, France
*
Authors to whom correspondence should be addressed.
Catalysts 2022, 12(2), 172; https://doi.org/10.3390/catal12020172
Submission received: 10 December 2021 / Revised: 22 January 2022 / Accepted: 25 January 2022 / Published: 28 January 2022
(This article belongs to the Special Issue Heterogeneous Selective and Total Catalytic Oxidation)
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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.
Keywords: VOCs; ozone; TiO2; manganese oxide; cordierite monolith support VOCs; ozone; TiO2; manganese oxide; cordierite monolith support

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MDPI and ACS Style

Touati, H.; Valange, S.; Reinholdt, M.; Batiot-Dupeyrat, C.; Clacens, J.-M.; Tatibouët, J.-M. Low Temperature Catalytic Oxidation of Ethanol Using Ozone over Manganese Oxide-Based Catalysts in Powdered and Monolithic Forms. Catalysts 2022, 12, 172. https://doi.org/10.3390/catal12020172

AMA Style

Touati H, Valange S, Reinholdt M, Batiot-Dupeyrat C, Clacens J-M, Tatibouët J-M. Low Temperature Catalytic Oxidation of Ethanol Using Ozone over Manganese Oxide-Based Catalysts in Powdered and Monolithic Forms. Catalysts. 2022; 12(2):172. https://doi.org/10.3390/catal12020172

Chicago/Turabian Style

Touati, Houcine, Sabine Valange, Marc Reinholdt, Catherine Batiot-Dupeyrat, Jean-Marc Clacens, and Jean-Michel Tatibouët. 2022. "Low Temperature Catalytic Oxidation of Ethanol Using Ozone over Manganese Oxide-Based Catalysts in Powdered and Monolithic Forms" Catalysts 12, no. 2: 172. https://doi.org/10.3390/catal12020172

APA Style

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), 172. https://doi.org/10.3390/catal12020172

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