Citation: Shu CHEN, Willian R. MOSER. OXIDATIVE COUPLING OF METHANE OVER BaPrO₃[J]. Chinese Chemical Letters, ;1991, 2(2): 181-184. shu

OXIDATIVE COUPLING OF METHANE OVER BaPrO₃

Shu CHEN ^a ,
Willian R. MOSER ^b

a Department of Chemical Engineering Beijing Institute of Chemical Fiber Technology, Beijing 100029, P. R. China;
b Department of Chemical Engineering Worcester Polytechnic Institute, Worcester, MA 01609, U. S. A

Received Date: 14 July 1990

Combinations of alkaline earth Ba and Sr in place of alkali with Pr and Ce which have stronger oxidation power may result in catalysts with better stability and activity. Studies on the optimization of Ba-Pr binary system were carried out with catalysts whose Ba/(Ba+Pr) atomic ratio are from 0 to 0.56, optimal selectivity was realized at BaPrO₃ which remains the constant reactivity, CH₄ conversion 20% and selectivity 57%, during run of 100h at the condition of 1083K and CH₄:O₂=5:1. Studies on the correlation of reactivity with composition of catalyst demonstrate that there is a synergism between basicity and oxidation power. XRD patterns show that Ba and Sr cations insert into lattices of PrO_1.8 and CeO₂ respectively, and suppress their combustion power. Kinetic measurements support the suggestion:the rate-determining-step of title reaction be breaking of C-H bond of methane on PrO_1.8 phase.
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