Diesel Oxidation Catalyst Combined to Non-Thermal Plasma: Effect on Activation Catalyst Temperature and by-products formationReportar como inadecuado




Diesel Oxidation Catalyst Combined to Non-Thermal Plasma: Effect on Activation Catalyst Temperature and by-products formation - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 GREMI - Groupe de recherches sur l-énergétique des milieux ionisés 2 RENAULT SAS

Abstract : The aim of this work is to study the pollutants removal efficiency together with the catalyst activation temperature when a Diesel Oxidation Catalyst DOC is placed downstream to a multi-plans Dielectric Barrier Discharge DBD reactor. In order to simulate Diesel engine exhaust, synthetic gas mixtures containing N2, O2, H2O, CO2, CO, NO, and hydrocarbons HCs at controlled concentrations could be heated at temperature up to 300°C. Catalytic material based on Pd and Pt supported on Al2O3 was used at a gas hourly space velocities GHSV of about 55 000 h-1. The major gaseous components as NOx, CO, CO2, and HCs were systematically investigated online and quantified using an electrochemical analyzer and a Fourier Transform Infrared Absorption Spectroscopy FTIR. Results show the advantageous plasma catalyst coupling effect on the lowering of the catalyst activation temperature. Improvement of about 20°C was obtained. As it is well known, the gas-phase chemistry in the plasma includes NO to NO2 conversion as well as HCs partial oxidation to CxHyOz. These species play an important role in the catalytic mechanisms. By-products such as aldehydes CH2O and alcohols CH3OH compounds were also detected together with a small amount of nitrous acid HONO when water was added into the gas mixture.

Keywords : DBD catalyst exhaust gas post-treatment Diesel





Autor: Alexis Leray - Ahmed Khacef - Maxime Makarov - Jean Marie Cormier -

Fuente: https://hal.archives-ouvertes.fr/



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