Remarkable enhancement of the selective catalytic reduction of NO at low temperature by collaborative effect of ethanol and NH3 over silver supported catalyst
| Autor: | Fabien Can, Daniel Duprez, Xavier Courtois, M. Barreau, Marie-Laure Tarot |
|---|---|
| Přispěvatelé: | Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
Diesel particulate filter
Hydrogen Chemistry Process Chemistry and Technology Inorganic chemistry [SDU.STU]Sciences of the Universe [physics]/Earth Sciences chemistry.chemical_element Selective catalytic reduction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Catalysis 0104 chemical sciences Diesel fuel Ammonia chemistry.chemical_compound 13. Climate action 0210 nano-technology ComputingMilieux_MISCELLANEOUS Lean burn NOx General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental Applied Catalysis B: Environmental, Elsevier, 2018, 220, pp.19-30. ⟨10.1016/j.apcatb.2017.08.015⟩ |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2017.08.015 |
| Popis: | The NOx selective catalytic reduction (SCR) is extensively studied as an effective process for air pollutants abatement from lean burn and Diesel vehicles. In the implemented Urea-SCR technology, the NO2/NOx ratio is a key parameter that limits the deNOx efficiency at low temperature (175–250 °C). We demonstrate that co-feeding of ammonia and ethanol on a Ag/Al2O3 catalyst enables a drastic enhancement of the NOx conversion at temperatures below 200 °C using only NO as NOx (standard SCR condition). Even if NO2 is provided at low temperature by the NO oxidation over Ag/Al2O3 in presence of EtOH, the NOx conversion improvement is not only due to a direct reaction between NH3 and NOx, but mainly attributed to the availability of hydrogen H* species resulting from EtOH oxidation (similar to a H2 assisted NH3-SCR process). Due to the presence of remaining NH3 and NO2 (formed over Ag/Al2O3 catalyst), further deNOx efficiency improvement was obtained at low temperature by addition of a NH3-SCR catalyst (WO3/Ce-Zr). The critical dependence of the SCR process on the Diesel Oxidation Catalyst (DOC) efficiency at low temperature is thus avoided. |
| Databáze: | OpenAIRE |
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