| 초록 |
Transition metal vanadates with a chemical formula of MV2O6 (M= Mn, Co, Ni, or Cu) can be featured by distinct characteristics in particular terms of Brönsted acidities and redox cycling efficiencies, both of which were reported to dictate selective NOX reduction (SCR) consequences of the catalysts at low temperatures. The MV2O6 phases, however, cannot be deployed to activate the low-temperature SCR due to the accumulation of ammonium sulfate (AS) and/or ammonium bisulfate (ABS) poisons on the surfaces. This presentation highlights our recent findings on the recovery of the SCR performance for the MV2O6 catalysts via catalytic degradation of AS/ABS poisons at low temperatures. Thermo-gravimetric analyzer (TGA) was coupled with mass spectrometer (MS) for monitoring the concentrations of NH3, H2O, and SO2 emitted from the poisoned MV2O6 surfaces. In addition, the TGA-MS experiments also serve to locate the MV2O6 phase optimized to decompose AS/ABS poisons at a low temperature. |
