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Selective oxidative coupling of methane over supported alkaline earth metal halide catalysts

1989; Elsevier BV; Volume: 50; Issue: 1 Linguagem: Inglês

10.1016/s0166-9834(00)80838-6

1873-3867

Kenjiro Fujimoto, Shigeru Hashimoto, Kenji Asami, Kohji Omata, H. TOMINAGA,

Magnetic and transport properties of perovskites and related materials

Halides of alkaline earth metals supported on calcium oxide or magnesium oxide were found to be excellent catalysts for the oxidative coupling of methane. For example, the selectivity with respect to C2 hydrocarbons over a 5 wt.-% MgCl2/CaO catalyst reached 90% or higher with a yield of 10% at 750°C and CH4/O2=9. Although the selectivity with respect to C2+ hydrocarbons gradually decreased with processing time, the in situ replenishment of the trace amount of halogen compound in the feed gas prevented this decrease. The halide ion in the catalyst is inferred to change the surface character of the alkaline earth metal oxide, reducing its ability for methane decomposition and resulting in suppression of the deep oxidation of methane.