High Throughput Approach Applied to VOC Oxidation at Low Temperature

International audienceA High Throughput (HT) approach is used to prepare and characterize the catalytic activity of materials for the destruction of Volatile Organic Compounds (VOC) at low temperature. The interest of the Designs of Experiments (DoE) in the primary screening is demonstrated through modeling catalysts composition according to the light-off temperature detected by infrared thermography. The combination of the mass spectrometry and the infrared thermography appears very useful to confirm and increase information about catalytic properties of the catalysts extracted to the primary screening stage. Finally, in situ Raman spectroscopy with infrared thermography allows to better understand the origin of the catalytic properties in the case ofAu/CeO2 catalysts. A strong interaction between gold and Ce-O bonds leading to an improvement of the cerium oxide reducibility could explain its high reactivity for 2-propanol oxidation at lower temperature

A new method to form BaTiO3 nanomaterials into spherical pellets used in a non thermal plasma catalytic application

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Coupling non-thermal plasma with photocatalysis for odorous pollutants removal

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Temperature runaway in a pulsed dielectric barrier discharge reactor

International audienceThis paper reports on experimental measurements of the gas temperature in a dielectric barrier discharge reactor powered by a high voltage pulsed signal. It is shown that the thermal behavior of the reactor follows a first order model. However, an unexpected runaway phenomenon was observed at a frequency of 300 Hz. A sudden increase in the power source and consequently in reactor temperature which reaches 170 degrees C is observed. This behavior is discussed in terms of input power variation with temperature, possibly due to a resonance phenomenon

Carbon dioxide dissociation to carbon monoxide by non-thermal plasma

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Synthesis and solid characterization of nitrogen and sulfur-doped TiO2 photocatalysts active under near visible light

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Au/xCeO(2)/Al2O3 catalysts for VOC elimination: oxidation of 2-propanol

International audience2- Propanol oxidation (1 mol% in air) was investigated over 1% Au/CeO2, 1% Au/Al2O3 and 1% Au/xCeO(2)/Al2O3 (x = 1.5, 3, 5 and 10 wt%) catalysts and the corresponding pure supports. The effects of the catalyst activation procedure (calcination or reduction), cerium oxide morphology and loading, the presence/absence of O-2 in the feed, and stability of activity were studied. The nature of the support strongly influences the 2- propanol oxidation pathway, and one can distinguish three reaction temperature ranges: low (50- 150 degrees C), intermediate (175- 250 degrees C) and high (> 300 degrees C). In the low temperature range, only acetone is formed whatever the nature of the support. On Au/Al2O3 and Au/xCeO(2)/Al2O3 catalysts propene becomes the main reaction product by increasing the temperature, followed by CO2 formation at higher temperature. The acidic character of Al2O3 and CeO2/Al2O3 promotes the propene formation whereas the basic one of CeO2 favors the formation of acetone, and the gold catalysts also present an acidic- basic behavior, which depends largely on the reaction temperature. Replacing air with He during the catalytic run over Au/Al2O3 and Au/CeO2 provides evidence of how O-2 is activated by Au, revealing, as expected, that dehydrogenation to form acetone and total oxidation to CO2 require both O-2 and Au as the catalyst, whereas dehydration to form propene does not require O-2. For both calcined and reduced catalysts, the catalytic activity towards total oxidation varies in the order: Au/CeO2 > Au/xCeO(2)/Al2O3 > Au/Al2O3

Influence of chlorine ions in Pt/A12O3 catalysts for methane total oxidation

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Processing and characterization of spherical alumina pellets coated with BaTiO3 and Li0.1Ti0.02Ni0.88O dielectric materials

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