To improve the NOxstorage capacity (NSC) of lean NOxtrap (LNT) catalysts of the Pt/BaO/Al2O3type, the catalyst was doped with redox active transition metals of Mn, Co, or Cu, respectively. Due to differences in the chemical states of the doped metals, the catalysts exhibited different catalytic behaviors. Co and Mn doped catalysts showed improved NO to NO2oxidation ability, and therefore enhanced NOxstorage capacities, which led to the increased cycle averaged NOxconversions as compared to a Pt/Ba/Al2O3reference. However, being limited by NOxreduction in rich phase, the NOxconversions were still poor at low temperatures (<250 °C). By employing an H2-plasma in rich phase to assist NOxreduction, NOxconversions were greatly enhanced especially for low temperatures (⩽250 °C). The best properties were achieved over Pt/Co/Ba/Al2O3catalyst which exhibited NOxconversions higher than 80% in the whole temperature range (150–350 °C) and best SO2resistance abilities.
|Number of pages||12|
|Journal||Chemical Engineering Journal|
|State||Published - 2017|
Bibliographical noteFunding Information:
The work was supported by the National Natural Foundation of China (Nos. 21373037, 21577013), the Fundamental Research Funds for the Central Universities (No. DUT15TD49 and DUT16ZD224). MC thanks the National Science Foundation and the U.S. Department of Energy (DOE) under award no. CBET-1258742. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.
© 2016 Elsevier B.V.
- Non-thermal plasma
- Transition metal oxide
ASJC Scopus subject areas
- Chemistry (all)
- Environmental Chemistry
- Chemical Engineering (all)
- Industrial and Manufacturing Engineering