Showing papers by "Yuhong Wang published in 1993"
TL;DR: In this paper, the catalytic performance of complex layered oxides with K 2 NiF 4 structure composing of alternating perovskite (ABO 3 ) and rock salt (AO) layers was studied for the oxidative coupling of methane to C 2 hydrocarbons.
Abstract: The catalytic performance of complex layered oxides with K 2 NiF 4 structure composing of alternating perovskite (ABO 3 ) and rock salt (AO) layers was studied for the oxidative coupling of methane to C 2 hydrocarbons. The partial substitution of transition metal ions in B position of the oxide by low valence metal ions such as Li, Zn and Mg ions was found to greatly improve the C 2 selectivity. A C 2 yield of 22% was obtained under 1073 K over Ca(Sr,Ba)LaFeLiO catalyst. Study of the deactivition showed that the CaLaFeLiO sample can maintain a C 2 yield of 19.2% after 420 hr on stream. The results are discussed on the basis of catalyst structure, valence state of transition metal ions in B site, and surface oxygen species.