Hollow Mesoporous Co3O4–CeO2 Composite Nanotubes with Open Ends for Efficient Catalytic CO Oxidation
Jiaqin He ，Dongyun Chen*（陈冬赟），Najun Li ，Qingfeng Xu，Hua Li， Jinghui He，Jianmei Lu*（路建美）
Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Coll Chem Chem Engn & Mat Sci, 199 Renai Rd, Sushou, Jiangsu, Peoples R China.
Catalytic performance is heavily dependent on how the structures of nanomaterials are designed. Co3O4–CeO2 composite nanotubes with open ends and mesoporous structures were fabricated through a facile and environmentally friendly reaction. The mesoporous Co3O4 nanotubes were synthesized by the calcination of cobalt–aspartic acid (Co–Asp) nanowires and coated with a CeO2 shell. The composite nanotubes were characterized by SEM, TEM, XRD, and X‐ray photoelectron spectroscopy. The composite materials comprise a combination of Co3O4 nanotubes and CeO2 nanoparticles with a hollow and mesoporous bimetallic oxide structure. The large BET surface area led to a higher degree of accessible active sites compared with other Co3O4–CeO2 composite nanomaterials with other structures. The resulting Co3O4–CeO2‐26.3 wt % composite nanotubes, with a CeO2 content of approximately 26.3 wt %, achieved 100 % CO conversion at 145 °C. Additionally, the synergistic effect between the two metal oxides comprising the Co3O4–CeO2 composite nanotubes was demonstrated by the enhanced catalytic activity compared with pure Co3O4 nanotubes and CeO2 nanoparticles.