MoO/TiO catalyst with atomically dispersed O-Mo-O structures toward improving NHHSO poisoning resistance for selective catalytic reduction of nitrogen oxides.

Slow progress in discovering new catalysts to circumvent the problem of ammonium bisulfate (NHHSO, ABS) poisoning has hindered further development of selective catalytic reduction (SCR) technology of NO with ammonia (from numerous industrial processes) in afterburning systems at temperatures below dew point of ABS (typically between 280 °C and 320 °C). Recently, we have explored the use of atomically dispersed Mo species on TiO particles (hereafter denoted as MoO/TiO) as highly efficient catalyst for NH-SCR reaction. In the present study, it will be shown that this type of catalyst is highly resistant to ABS poisoning for NH-SCR reaction, overcoming a major issue afflicting the application of commercial VO-WO/TiO catalyst at temperatures below the dew point of ABS.

Rationalizing the promotional effect of Mn oxides in benzene combustion using an O 2p-band center descriptor.

Our work sheds light on using the O 2p-band center as a useful electronic descriptor for understanding the variations in catalytic reducibility of transition metal oxides (TMOs) and the promotional effect of MnO2 during catalytic benzene combustion. The "volcano"-type activity plot, in conjunction with the reduction characteristic of the TMOs, ultimately reflects the Sabatier principle, which states that a good catalyst (i.e.