Advance in the scaling up of a hybrid catalyst for NSR-SCR coupled systems under H2O + CO2 atmosphere
| Autor: | Concepción Herrera, Marina Cortés-Reyes, M. Ángeles Larrubia, Luis J. Alemany |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology General Chemistry Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Catalysis 0104 chemical sciences Diesel fuel Chemical engineering chemistry Hybrid system 0210 nano-technology Zero emission NOx Space velocity |
| Zdroj: | Catalysis Today. 356:292-300 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2019.05.010 |
| Popis: | An efficient De-NOxing after-treatment technology could be technically solved by scaling up a hybrid NSR-SCR structured catalyst. A reproducible synthesis approach of NSR and SCR monolithic catalyst has been developed, able to eliminate NOx and achieve zero emissions in the exhaust gases of diesel engines. Pt-Ba-K/Al2O3 and 2Cu-SAPO-34, as improved formulations, were incorporated as active-phase using an alumina-coated cordierite monolith-support. DeNOx overall activity, performed in NSR conditions with presence of water and CO2 atmosphere, showed a complete concordance with the results for the catalysts in powder form. At low GHSV, the operation parameters provided conversion values around 97% with minimum NO slip ensuring zero emissions under lab-scale conditions. The operational parameters as hydrogen concentration of 1% and θ (lean/rich time ratio) value of 7, are enough to achieve more than 95% of conversion of NOx with total selectivity to nitrogen in the whole temperature range. The NSR-SCR hybrid system with volumetric ratio 1:1 and active phase load of 2 wt% produces high levels of mineralization to nitrogen without N2O or NH3 slip in cyclic conditions tested in water and CO2. |
| Databáze: | OpenAIRE |
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