We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Catalytic Oxidation of Low Concentration Methane by Co<sub>3</sub>O<sub>4</sub> Prepared via SCS Method.
- Authors
FEI Ke; YANG Changzhen; ZHAO Mengqi; ZHANG Yaxin; GUO Hao; LIAO Yinnian
- Abstract
The ratio of oxidant (cobalt nitrate) to fuel (citric acid) in the precursor could exert great influence on the catalytic oxidation of low concentration methane of Co3O4, which was prepared by solution combustion synthesis. With the increasing of fuel proportion, the specific surface area of Co3O4 and the catalytic performance gradually increased. Among all of the obtained Co3O4 samples, the one obtained by setting the oxidant/fuel ratio to be 1:2 (named as Co1CA2) showed the smallest crystal size and higher specific surface area. In addition, the Co1CA2 displayed not only better reducibility, but also a richer surface of Co2+ and Oads, and the Co--O bond in this catalyst is more likely to break, which means more reactive oxygen species can be provided and thus would bring benefit to the catalytic activity of Co3O4 during the methane oxidation. Therefore, in the catalytic oxidation of low concentrations of methane, Co1CA2 performed the highest catalytic activity with a T90 value of 370 °C, which is 68 °C lower than the Co3O4 obtained by calcining oxidant directly. After three discontinuous stability tests, the removal rate of methane by Co1CA2 was still above 90%, showing good water resistance, repeatability, and durability.
- Subjects
CATALYTIC oxidation; SELF-propagating high-temperature synthesis; PARTIAL oxidation; REACTIVE oxygen species; METHANE; CATALYTIC activity; OXIDATION
- Publication
Environmental Science & Technology (10036504), 2023, Vol 46, Issue 10, p121
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1032.23.338