期刊
CHEMICAL PHYSICS
卷 540, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.chemphys.2020.110984
关键词
Citric acid complex strategy; Mixed-phase CoO-Co3O4; Interaction; Catalytic oxidation; Propane
资金
- Sichuan Science and Technology Program [2018GZ0314]
- Light of the West Fund of the Chinese Academy of Sciences
A series of pure Co3O4 and mixed-phase CoO-Co3O4 nanoparticles were successfully synthesized through a facile citric acid complex strategy, showing good catalytic activity and stability in propane conversion.
A series of pure Co3O4 and mixed-phase CoO-Co3O4 nanoparticles were synthesized through a facile citric acid complex strategy. Different from pure Co3O4, the extra CoO is beneficial to the formation of small crystalline size (11.8 nm), large specific surface area (62.8 m(2).g(-1)), and high Co2+/Co3+ and O-ads/O-latt, ratios. Moreover, the interaction between CoO and Co3O4 diminishes the electron cloud density in the outer layer of O atom, weakens the strength of the Co-O bond, and improves the mobility of active oxygen species. At a GHSV of 30,000 ml.g(-1).h(-1) , the mixed-phase CoO-Co3O4 converted propane to 90% only at 235 degrees C. After 40 h of reaction, CoO was oxidized into smaller Co3O4 particles and maintained a stable catalytic activity. Further research found that the mixed-phase CoO-Co3O4 still has good activity (T-90 = 250 degrees C) even at high GHSV (75,000 ml.g(-1).h(-1)). The outstanding performance of nanoparticles makes it possible to achieve deep purification of VOCs under high GHSV.
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