Effect of alkali or alkaline earth metals (Li, Na, K, Mg, Ca, and Sr) as additives to Co/Al2O3 on CH4–CO2 reforming and carbon formation was examined. It was shown that the alkali metals decreased the reforming rate, whereas the rate was scarcely influenced by the alkaline earth ones. Carbon deposition was also more markedly retarded by the alkali metals than the alkaline earth ones. It was revealed that one of the essential roles of the basic additives was to reduce the ability of cobalt for methane decomposition through a partial covering of the active sites. Another effect was to modify acid-base properties of the catalyst surface toward higher basicity thus increasing adsorption of acidic CO2. Abundance of adsorbed CO2 on the catalyst should be an unfavorable condition for decomposition of methane and consequently, carbon formation was further suppressed. It was also suggested that carbon gasification rate was not significantly influenced by the additives.
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The author thanks Mr. Y. Kawaguchi and Miss T. Sugiura for their assistances in the experimental works, and declares that he has no conflict of interest.
Abbreviations: TG – thermogravimetry, TPR – temperature programmed reduction, XRD – X-ray diffraction.
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Osaki, T. Role of Alkali or Alkaline Earth Metals as Additives to Co/Al2O3 in Suppressing Carbon Formation during CO2 Reforming of CH4. Kinet Catal 60, 818–822 (2019). https://doi.org/10.1134/S0023158419060090
- CH4–CO2 reforming
- alkali and alkaline earth metals
- carbon deposition