TY - JOUR
T1 - NOx storage and reduction properties of model manganese-based lean NOx trap catalysts
AU - Zhang, Zhao shun
AU - Chen, Bing bing
AU - Wang, Xin kui
AU - Xu, Li
AU - Au, Chaktong
AU - Shi, Chuan
AU - Crocker, Mark
N1 - Funding Information:
The work was supported by the National Natural Science Foundation of China (Nos. 21373037 , 21073024 and 21176037 ). MC thanks the National Science Foundation and the U.S. Department of Energy (DOE) for financial support 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.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.
AB - In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.
KW - Manganese
KW - NO oxidation
KW - NO adsorber
KW - NO storage-reduction
KW - Palladium
UR - http://www.scopus.com/inward/record.url?scp=84908433332&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2014.10.001
DO - 10.1016/j.apcatb.2014.10.001
M3 - Journal article
AN - SCOPUS:84908433332
SN - 0926-3373
VL - 165
SP - 232
EP - 244
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -