Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 283, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119657
Keywords
Co3O4; Exposed facets; Propane; Catalytic oxidation; DFT studies
Funding
- National Natural Science Foundation of China [21876139, 21922606, 21677114]
- Key R&D Program of Shaanxi Province [2019SF-244, 2019ZDLSF05-05-02]
- Shaanxi Natural Science Fundamental Shaanxi Coal Chemical Joint Fund [2019JLM-14]
- K.C. Wong Education Foundation
- Instrument Analysis Center of Xi'an Jiaotong University
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The low-temperature degradation of short chain alkanes is a major challenge in purifying volatile organic compounds. Co3O4 nanomaterials with different crystal facets were fabricated, and rod-like structures showed the highest activity due to their unique properties. The rod-like structure of Co3O4 has the lowest formation energy of oxygen vacancies on the (110) facet, making it an efficient catalyst for propane oxidation.
Low-temperature degradation of short chain alkane is one of the greatest challenges of volatile organic compound purification. Here, rod-, sheet-, and cube-like Co3O4 (Co3O4-R, Co3O4-S, and Co3O4-C) with predominantly exposed (110), (111), and (100) facets respectively were fabricated. Co3O4-R presents excellent activity achieving 90 % of propane oxidized at just 195 degrees C owing to large amounts of lattice defects, oxygen vacancies and low coordinated Co atoms. Theoretical calculation reveals that Co3O4-R has the lowest formation energy of oxygen vacancy on (110) facet (E-vo (110) =1.7 eV), which has a higher activation capacity for oxygen due to the largest O-2 adsorption energy (-1.30 eV) and thus accelerates propane oxidation. Moreover, largest amount of lewis acid-base pairs existed in Co3O4-R polarizes substrate electron distribution and therefore accelerates the activation of C-H bonds. Electrophilic oxygen species (O-2(2-) or O-) caused the degradation of carbon skeleton and formed carboxylate intermediates before mineralized to CO2.
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