Silver species reduction upon exposure of Ag/Al2O3 catalyst to gaseous ethanol: An in situ Quick-XANES study - Sorbonne Université Access content directly
Journal Articles Catalysis Today Year : 2012

Silver species reduction upon exposure of Ag/Al2O3 catalyst to gaseous ethanol: An in situ Quick-XANES study

Abstract

The evolution of supported silver species of a pre-calcined Ag/Al2O3 catalyst was monitored upon thermal treatment under an air flow enriched with 3000 ppm of ethanol (EtOH) using transmission electron microscopy and UV-visible and X-ray absorption spectroscopies. A special focus is put on the application of in situ Quick-XAS that permits to acquire high quality spectra at the Ag K-edge with a good time resolution (30 s), thus informing in real time on the transformations of the silver species. While the reduction of silver under Air/EtOH flow is shown to possibly occur at room temperature, the process is strongly accelerated by heating, most of the silver being indeed reduced at ca. 78 °C, a temperature which corresponds to the ethanol boiling point. The possible impact of this silver sensitivity on the behavior of silver-alumina catalysts in reactions such as the selective catalytic reduction (SCR) of NOx in presence of ethanol is addressed.

Dates and versions

hal-00745963 , version 1 (26-10-2012)

Identifiers

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Elie Sayah, Camille La Fontaine, Valérie Briois, Dalil Brouri, Pascale Massiani. Silver species reduction upon exposure of Ag/Al2O3 catalyst to gaseous ethanol: An in situ Quick-XANES study. Catalysis Today, 2012, 189, pp.55-59. ⟨10.1016/j.cattod.2012.03.055⟩. ⟨hal-00745963⟩
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