| 초록 |
Cu/SAPO-34 is recently commercialized as selective catalytic reduction (NH3-SCR) of NOx using NH3 as a reductant for diesel engine exhaust. Generally Cu/SAPO-34 catalysts were synthesized using solution ion exchange method of Cu2+ ion on SAPO-34 zeolites. However, it was known that SAPO-34 undergoes the irreversible hydrolysis during the aqueous solution ion exchange and these moisture sensitivity is also related to the long term stability of these materials. In this work, we investigated the hydrothermal stability of Cu/SAPO-34 and SAPO-34 using XRD, SEM and BET. Also, 27Al, 29Si and 31P MAS NMR after hydrothermal treatment at different conditions. We also confirmed the NH3-SCR activity and selectivity of Cu/SAPO-34 before and after hydrothermal treatment. |
