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Enhancement of SCR performance of monolithic Mn–Ce/Al 2 O 3 /cordierite catalysts by using modified deposition precipitation method
Author(s) -
Li Xin,
Li Quan,
Li Wei,
Zhang Xiaopei,
Zhong Liu,
Zhang Cheng,
Fang Qingyan,
Chen Gang
Publication year - 2019
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2318
Subject(s) - cordierite , catalysis , materials science , precipitation , deposition (geology) , selective catalytic reduction , chemical engineering , phase (matter) , redox , nuclear chemistry , inorganic chemistry , metallurgy , chemistry , paleontology , biochemistry , physics , organic chemistry , sediment , meteorology , engineering , biology
Mn–Ce catalysts have been widely studied for low‐temperature selective catalytic reduction (SCR) of NO x with NH 3 ; however, most of them are powdery or granular. Monolithic catalysts which are more suitable for practical industrial applications still need detailed exploration. In this research, a series of monolithic Mn–Ce/Al 2 O 3 /cordierite catalysts were prepared by impregnation (IMP), deposition precipitation (DP), and modified deposition precipitation (MDP) methods. The catalyst MDP3 which depositing alumina and MnO x –CeO x simultaneously for three times by MDP method showed the best activity, and it performed much better at low temperature than the catalysts prepared by IMP and DP methods. MDP3 also showed the best resistance to H 2 O and SO 2 . It was thought that Mn–Al and Mn–Al–Ce clusters formed in the preparation of MDP3 and enhanced the interaction between the mixed oxides, as indicated by the characterization results. MDP3 prepared by MDP method showed the largest BET surface area, good redox capabilities, and the highest atomic ratios of Ce 3+ and O b . Hence, MDP was proved to be an effective method to enhance the interaction between the washcoat and the active phase, which resulted in preparing a good performance monolithic SCR catalyst.