SHU Hang, ZHANG Yuhua, FAN Hongmei, et al. FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal[J]. CIESC Journal, 2015, (11): 4460-4468.
SHU Hang, ZHANG Yuhua, FAN Hongmei, et al. FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal[J]. CIESC Journal, 2015, (11): 4460-4468.DOI: 10.11949/j.issn.0438-1157.20150450.
The mechanism of ammonium bisulfate formation and decomposition over a commercial V2O5-WO3/TiO2 catalyst was explored using FT-IR. The results suggest that the formation of ammonium bisulfates mainly occurs in two ways: reaction between activated NH3 adsorbed coordinatedly on Lewis acid sites of catalyst V═O groups and SO2 under atmosphere containing O2;and reaction between absorbed intermediate of metal sulfates VOSO4 and gaseous NH3. NO could react directly with NH4+ in NH4HSO4
which could lower its decomposition temperature
promoting the catalytic decomposition of adsorbed bisulfates (ABS) on catalyst surface. So
there is mutual inhibition between NO removal and ABS formation. Loading of ABS deposited on catalyst surface also affects its decomposition and volatilization.