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Enhancement of soot oxidation activity of manganese oxide ( Mn 2 O 3 ) through doping by the formation of Mn 1.9 M 0.1 O 3– δ ( M = Co , Cu , and Ni )
Author(s) -
Neelapala Satya Deepika,
Patnaik Harsh,
Dasari Harshini
Publication year - 2018
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.2234
Subject(s) - x ray photoelectron spectroscopy , manganese , coprecipitation , catalysis , dopant , materials science , thermogravimetric analysis , oxide , analytical chemistry (journal) , redox , scanning electron microscope , doping , nuclear chemistry , inorganic chemistry , chemistry , chemical engineering , metallurgy , optoelectronics , biochemistry , organic chemistry , chromatography , engineering , composite material
The current work describes the catalytic soot oxidation activity of metal‐doped manganese oxide (Mn 1.9 M 0.1 O 3– δ ; M = Co , Cu, and Ni) materials, synthesized by coprecipitation method. All the fabricated materials were characterized using X‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller surface area analysis, and X‐ray photoelectron spectroscopy (XPS). XRD analysis confirmed the formation of solid solution Mn 1.9 M 0.1 O 3– δ (M = Co , Cu, and Ni). M‐doped samples exhibited different morphology when compared with pure Mn 2 O 3 as evidenced by FESEM analysis, and Co ‐doped Mn 2 O 3 possessed the highest specific surface area. XPS analysis revealed the presence of multiple oxidation states of Mn (+4, +3, and +2) and Co (+2 and +3). Soot oxidation activity tests, performed using thermogravimetric analysis, showed that Mn 1.9 Co 0.1 O 3– δ exhibited better catalytic performance ( T 50 = 390°C) when compared with pure Mn 2 O 3 ( T 50 = 490°C). The incorporation of dopants greatly enhanced the oxygen vacancies and redox properties of Mn 2 O 3 .