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- W2560527708 abstract "The identity and rate constants of elementary steps in primary reactions of oxidative coupling of methane (OCM) over Pb2+ and/or F− substituted hydroxyapatite (HAP, Pb-HAP, HAP-F, and Pb-HAP-F) catalysts have been studied. The rigorous kinetics analysis suggests that HAP and HAP-F initiated the reaction between adsorbed methane and O2 following Langmuir-Hinshelwood behavior. The Pb-HAP and Pb-HAP-F, however, enabled the reaction between gaseous methane and adsorbed O2 in the Eley-Rideal mechanism. The F− substitution of OH− weakened both O2 adsorption and CH bond activation, leading to low methane conversion and slightly higher C2H6 selectivity. The substitution of Ca2+ by Pb2+ weakened both methane and oxygen adsorptions, but maintained CH bond activation and raised C2H6 selectivity. The present analysis explored for the first time the effects of cation and/or anion in HAP on OCM reactions in which the analysis has been detailed and quantified in the nature of the mechanism-based kinetic models." @default.
- W2560527708 created "2016-12-16" @default.
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- W2560527708 date "2017-03-01" @default.
- W2560527708 modified "2023-10-17" @default.
- W2560527708 title "Catalytic consequences of cation and anion substitutions on rate and mechanism of oxidative coupling of methane over hydroxyapatite catalysts" @default.
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- W2560527708 doi "https://doi.org/10.1016/j.fuel.2016.11.106" @default.
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