Dynamics of low temperature N2O formation under SCR reaction conditions over a Cu-SSZ-13 catalyst
| Autor: | Christopher J. Keturakis, Nathan Ottinger, Yuanzhou Xi, Z. Gerald Liu |
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| Rok vydání: | 2021 |
| Předmět: |
In situ
Process Chemistry and Technology Inorganic chemistry Selective catalytic reduction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound SSZ-13 Nitrate chemistry Titration 0210 nano-technology Zeolite NOx General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 294:120245 |
| ISSN: | 0926-3373 |
| Popis: | Small pore Cu-SSZ-13 zeolite can effectively catalyze selective catalytic reduction (SCR) for NOx (NO and NO2) using NH3 as a reductant. However, side reactions leading to the formation of N2O, a greenhouse gas, occur in parallel under SCR reaction conditions. This work investigates the fundamental characteristics of N2O formation during SCR reactions over a Cu-SSZ-13 catalyst under both steady-state and transient conditions during reactant transitions at 200 °C. The absence of nitrate bands from in situ DRIFTS experiments and the inconsistencies between high stability of NH4NO3 and N2O formation at low temperature exclude the formation of surface nitrate or NH4NO3 as a precursor of N2O formation as the major path under standard SCR reaction conditions at 200 °C. The analysis from the transient N2O formation behavior during reactant transitions and NO + NH3 titration experiments indicates that more oxidized Cu-SSZ-13 catalyst, containing higher amount of Cu-oxy species, produces higher amount of N2O. |
| Databáze: | OpenAIRE |
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