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Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route
Author(s) -
Guo Hao,
Li Yizhuo,
Jiang Zhi,
Zhang Zhixiang,
Chen Mingxia,
Einaga Hisahiro,
Shangguan Wenfeng
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6280
Subject(s) - catalysis , x ray photoelectron spectroscopy , oxalate , adsorption , specific surface area , benzene , nickel , composite number , inorganic chemistry , oxide , manganese , materials science , bet theory , oxygen , chemistry , chemical engineering , nuclear chemistry , metallurgy , organic chemistry , composite material , engineering
BACKGROUND Benzene (C 6 H 6 ) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C 6 H 6 . By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N 2 )‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnO x ). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnO x , the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C 6 H 6 . Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T 90 value of 172 °C (C 6 H 6 concentration 200 ppm, WHSV 60 000 mL g −1 h −1 ) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry