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Hollow Multishelled Structure of Heterogeneous Co 3 O 4 –CeO 2− x Nanocomposite for CO Catalytic Oxidation
Author(s) -
Wang Huan,
Mao Dan,
Qi Jian,
Zhang Qinghua,
Ma Xiaohong,
Song Shuyan,
Gu Lin,
Yu Ranbo,
Wang Dan
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806588
Subject(s) - materials science , catalysis , carbon monoxide , nanocomposite , oxygen , chemical engineering , molar ratio , diffusion , nanotechnology , organic chemistry , chemistry , thermodynamics , engineering , physics
Herein, hollow multishelled structure (HoMS) of Co 3 O 4 –CeO 2− x nanocomposites with controllable molar ratio of Co and Ce elements is synthesized by a general strategy sequential templating approach (STA) with a facile and efficient electrostatic spray process. As a catalyst of carbon monoxide (CO) catalytic oxidation, Co 3 O 4 –CeO 2− x (Co/Ce = 4/1) HoMS achieves good catalytic activity (complete conversion temperature is 166.9 °C) and stability (100 h). This performance is attributed to synergistic effects between the two components. The combination of Co 3 O 4 and CeO 2 not only generates more interfaces of Co 3 O 4 –CeO 2− x , which is more favorable for the activation of oxygen, but also improves the oxidizability of Co 3 O 4 as well as the capacity of oxygen storage of CeO 2 . In addition, the relatively larger effective specific surface area of the HoMS can provide more active sites, while the unique structure of HoMS can facilitate gas diffusion and maintain structural stability.