Oxidative coupling of methane over Y2O3CaO catalysts

66Citations
Citations of this article
7Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Binary oxides of Y2O3CaO were evaluated as catalysts in the oxidative coupling of methane to C2+ (sum of C2H6, C2H4, C3H8, and C3H6) hydrocarbons. Passing a mixture of CH4/O2 and He gases (at 6, 3 and 31 ml/min respectively) in a fixed-bed flow reactor 13% and 7.5% of C2+ yields were achieved at 750°C and 650°C, respectively, over 0.5 g of 10 mol-% Y2O3CaO catalyst prepared by calcining a coprecipitate of their oxalates at 800°C. The C2+ yields on 10 mol-% Y2O3CaO, prepared by physical mixing, were lower than those on the coprecipitated catalyst. With increasing Y2O3 content in the coprecipitated catalyst, the C2+ selectivity at 700°C was significantly enhanced even at ca. 3 mol-%, whereas at 600°C such a change was not observed. A similar dependence on the Y2O3 content was found in the way both surface areas and basicities decreased. Those changes were attributed to the formation of a solid solution accompanying the production of interstitial oxygen ions. Electron-spin resonance (ESR) studies indicated that the ion is a superoxide ion which is responsible for the generation of methyl radical from methane. At low reaction temperatures, 700°C, it was found that a lattice distortion of Y2O3 in the binary oxides also affected the C2+ selectivity. © 1990.

Cite

CITATION STYLE

APA

Osada, Y., Koike, S., Fukushima, T., Ogasawara, S., Shikada, T., & Ikariya, T. (1990). Oxidative coupling of methane over Y2O3CaO catalysts. Applied Catalysis, 59(1), 59–74. https://doi.org/10.1016/S0166-9834(00)82187-9

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free