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Monolithic LaBO 3 (B=Mn, Co or Ni)/Co 3 O 4 /cordierite Catalysts for o ‐Xylene Combustion
Author(s) -
Sun Xuewei,
Wu Dongfang
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901034
Subject(s) - cordierite , catalysis , non blocking i/o , perovskite (structure) , materials science , calcination , hydrothermal circulation , catalytic combustion , chemical engineering , specific surface area , inorganic chemistry , chemistry , organic chemistry , engineering
Perovskite/perovskite‐like (LaBO 3 , B=Mn, Co or Ni)/Co 3 O 4 with different morphologies were successfully integrated onto the surface of three‐dimensional (3‐D) cordierite honeycomb ceramics by two‐step combination method of hydrothermal synthesis and impregnation for the catalytic combustion of o ‐xylene. The La 2 NiO 4 /Co 3 O 4 composite exhibits a 3D hierarchical hollow microsphere construction assembled by numerous nanowires, which is different from the nanowire structure of LaMnO 3.15 /Co 3 O 4 and LaCoO 3 /Co 3 O 4 . Compared to LaMnO 3.15 /cordierite, Co 3 O 4 /cordierite, LaMnO 3.15 /Co 3 O 4 /cordierite and LaCoO 3 /Co 3 O 4 /cordierite, the La 2 NiO 4 /Co 3 O 4 /cordierite catalyst possesses lower light‐off temperature and better catalytic performance. The higher catalytic activity of La 2 NiO 4 /Co 3 O 4 /cordierite catalyst may be correlated with higher specific surface area, larger oxygen storage and the synergistic effect of the La 2 NiO 4 and Co 3 O 4 . In addition, when the perovskite‐like loading was 11.39 wt% and calcined at 600 °C for 4 hours, it exhibited the best catalytic performance for o ‐xylene oxidation with 90% conversion at 299 °C. In addition, the catalyst also has good conversion stability.