Indexed by:期刊论文

Date of Publication:2013-08-01

Journal:CATALYSIS TODAY

Included Journals:SCIE、EI

Volume:211

Page Number:96-103

ISSN No.:0920-5861

Key Words:LaMn0.9Fe0.1O3; Perovskite; NOx storage; H-2-plasma; LNT catalyst; Non-thermal plasma

Abstract:Based on its high NOx storage capacity (NSC), a study of the properties of LaMn0.9Fe0.1O3 in NOx storagereduction catalysis was undertaken. The microstructure of the LaMn0.9Fe0.1O3 catalyst was characterized by XRD, XPS and H-2-TPR techniques and compared with that of LaMnO3. The role of Fe doping in LaMnO3 on the perovskite structure and on NOx storage capacity was clarified. Though the LaMn0.9Fe0.1O3 perovskite has high NSC values even at relatively low temperature (<300 degrees C), it shows much lower activity during lean-rich cycling compared with a traditional Pt/BaO/Al2O3 catalyst, indicating that regeneration of stored NOx is the rate limiting step for the perovskite catalyst. By employing an H-2-plasma in the rich phase to assist reduction of the stored NOx, the NOx conversion is greatly improved, especially at low temperature. The results of the present study show that by combining the high NOx storage capacity of the perovskite in the lean phase with non-thermal plasma-assisted activation of the reductant in the rich phase, high NOx conversion can be obtained at low temperature. (C) 2013 Elsevier B.V. All rights reserved.