MoO3/TiO2 catalyst with atomically dispersed O-Mo-O structures toward improving NH4HSO4 poisoning resistance for selective catalytic reduction of nitrogen oxides.

Journal of Hazardous Materials
Sufeng GuoGuohua Jing

Abstract

Slow progress in discovering new catalysts to circumvent the problem of ammonium bisulfate (NH4HSO4, ABS) poisoning has hindered further development of selective catalytic reduction (SCR) technology of NOx 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 TiO2 particles (hereafter denoted as MoO3/TiO2) as highly efficient catalyst for NH3-SCR reaction. In the present study, it will be shown that this type of catalyst is highly resistant to ABS poisoning for NH3-SCR reaction, overcoming a major issue afflicting the application of commercial V2O5-WO3/TiO2 catalyst at temperatures below the dew point of ABS. Aberration-corrected scanning transmission electron microscopy (STEM) suggests that most of the Mo species are present in atomically dispersed form in the MoO3/TiO2 catalyst. SO2 oxidation measurements show that the MoO3/TiO2 catalyst exhibits a substantially lower SO2 oxidation rate compared to the commercial V2O5-WO3/TiO2, mitigating ABS formation. Furthermore, decomposition of ABS on MoO3/TiO2 surface is found to be extremely facile. Temperature-progra...Continue Reading

References

Dec 14, 1984·Science·P H Abelson
Aug 16, 2014·Science·Brendan Mackey, David Lindenmayer
Apr 10, 2019·Environmental Science & Technology·Zhiwei HuangGuohua Jing
May 24, 2019·Environmental Science & Technology·Dong WangJohn Crittenden

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