Light olefins by methane partial oxidation using hydrated waste eggshell as catalyst

[摘要] Catalysts obtained from the residual eggshell were prepared by calcination-hydration-calcination cycles under static atmosphere or under air flow and evaluated in the oxidative coupling of methane to obtain C-2-C-3 hydrocarbons. It was found that the calcination-hydration-calcination cycles under different conditions influence the specific surface area, the crystallinity and the basicity of the obtained materials. The production of light olefins from methane was observed under all samples. The best results were obtained for the hydrated sample calcined under air flow, reaching a methane conversion of 30% and selectivity for ethylene above 53% at 800 degrees C. The hydrated and muffle-calcined sample showed a higher C-2/CO2 ratio. These differences are attributed to the strength of the basic sites and the presence of surface lattice oxygen.

[发布日期] 2021-09-15

[关键词] Calcination-hydration cycles;Catalysts;Light olefins;Oxidative coupling of methane;Waste eggshell