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Effect of Ordered Mesoporous Alumina Support on the Structural and Catalytic Properties of Mn−Ni/OMA Catalyst for NH 3 −SCR Performance at Low‐temperature
Author(s) -
Liu Yongjin,
Hou Yaqin,
Han Xiaojin,
Wang Jiancheng,
Guo Yaoping,
Xiang Ning,
Bai Yarong,
Huang Zhanggen
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901466
Subject(s) - catalysis , mesoporous material , x ray photoelectron spectroscopy , selectivity , redox , materials science , pyridine , inorganic chemistry , chemistry , dispersion (optics) , chemical engineering , organic chemistry , engineering , physics , optics
Mn−Ni oxides supported on ordered mesoporous alumina (OMA) catalysts were applied to the NH 3 −SCR of NO x at low‐temperature compared with Mn−Ni oxides supported on commercial γ‐Al 2 O 3 . The NO x conversion and N 2 selectivity of Mn−Ni/OMA were superior to the Mn−Ni/γ‐Al 2 O 3 in the temperature window of 90∼240 °C. BET, XRD, NH 3 −TPD, NO+O 2 −TPD, Pyridine‐IR, H 2 −TPR, and XPS were performed to characterized the physicochemical properties of the catalysts. The characterization results manifested that supports conduct a significant part on the structural and catalytic properties of catalysts for NH 3 −SCR performance. Compared with Mn−Ni/Al 2 O 3 , the super SCR performances of Mn−Ni/OMA could be ascribed to not only the higher dispersion of MnO x but also more abundant Lewis acid sites, and the increase in redox capacity since the extremely primary MnO 2 phase on catalyst's surface. Furthermore, in situ DRIFTs were conducted to detect the SCR‐reaction mechanism over the two catalysts. Results demonstrate that although the OMA support can greatly enhance the catalytic activity of Mn−Ni/OMA catalysts, the reaction mechanism over Mn−Ni/OMA does not alter in comparison with Mn−Ni/Al 2 O 3 . Namely, the concurrence of Langmuir‐Hinshelwood (L−H) and Eley‐Rideal (E−R) mechanism, among which the E−R mechanism plays a dominant role.