TY - JOUR
T1 - Mn/CeO 2 catalysts for SCR of NO x with NH 3 comparative study on the effect of supports on low-temperature catalytic activity
AU - Gao, Ge
AU - Shi, Jian Wen
AU - Liu, Chang
AU - Gao, Chen
AU - Fan, Zhaoyang
AU - Niu, Chunming
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/7/31
Y1 - 2017/7/31
N2 - Two Mn/CeO 2 catalysts were successfully prepared by the impregnation of Mn precursor on two supports, CeO 2 microspheres (CeO 2 -MSs) and CeO 2 microrods (CeO 2 -MRs), respectively. The obtained Mn/CeO 2 -MSs and Mn/CeO 2 -MRs catalysts were characterized by SEM, TEM, XRD, N 2 physical adsorption, Raman spectroscopy, XPS, H 2 -TPR, NH 3 -TPD and in situ DRIFT in detail, and their catalytic activities and N 2 selectivities were studied by selective catalytic reduction (SCR) of NO x with NH 3 . The results showed that the Mn/CeO 2 -MSs catalyst presented much superior catalytic activity to the counterpart Mn/CeO 2 -MRs catalyst, and an almost 100% NO x conversion was maintained at 150–240 °C under a high space velocity of 36,000 h −1 . The high catalytic performance of Mn/CeO 2 -MSs can be attributed to a series of better properties in comparison with Mn/CeO 2 -MRs, such as unique yolk@void@shell microsphere structure, much larger specific surface area, higher relative percentages of Mn 4+ /Mn n+ and Ce 3+ /(Ce 3+ Ce 4+ ), more easily reduced of Mn species, more Brønsted acid sites. Furthermore, Mn/CeO 2 -MSs catalyst presented excellent resistance to H 2 O deactivation and SO 2 poison, and the SCR reaction mechanism over Mn/CeO 2 -MSs followed both E-R and L-H mechanisms.
AB - Two Mn/CeO 2 catalysts were successfully prepared by the impregnation of Mn precursor on two supports, CeO 2 microspheres (CeO 2 -MSs) and CeO 2 microrods (CeO 2 -MRs), respectively. The obtained Mn/CeO 2 -MSs and Mn/CeO 2 -MRs catalysts were characterized by SEM, TEM, XRD, N 2 physical adsorption, Raman spectroscopy, XPS, H 2 -TPR, NH 3 -TPD and in situ DRIFT in detail, and their catalytic activities and N 2 selectivities were studied by selective catalytic reduction (SCR) of NO x with NH 3 . The results showed that the Mn/CeO 2 -MSs catalyst presented much superior catalytic activity to the counterpart Mn/CeO 2 -MRs catalyst, and an almost 100% NO x conversion was maintained at 150–240 °C under a high space velocity of 36,000 h −1 . The high catalytic performance of Mn/CeO 2 -MSs can be attributed to a series of better properties in comparison with Mn/CeO 2 -MRs, such as unique yolk@void@shell microsphere structure, much larger specific surface area, higher relative percentages of Mn 4+ /Mn n+ and Ce 3+ /(Ce 3+ Ce 4+ ), more easily reduced of Mn species, more Brønsted acid sites. Furthermore, Mn/CeO 2 -MSs catalyst presented excellent resistance to H 2 O deactivation and SO 2 poison, and the SCR reaction mechanism over Mn/CeO 2 -MSs followed both E-R and L-H mechanisms.
KW - CeO
KW - De-NO
KW - Low temperature
KW - MnO
KW - Selective catalytic reduction
UR - https://www.scopus.com/pages/publications/85016441404
U2 - 10.1016/j.apsusc.2017.03.164
DO - 10.1016/j.apsusc.2017.03.164
M3 - 文章
AN - SCOPUS:85016441404
SN - 0169-4332
VL - 411
SP - 338
EP - 346
JO - Applied Surface Science
JF - Applied Surface Science
ER -