Preparation of a Voluminous Composite Oxide of BaLa2O4 and Its Catalytic Performance for the Oxidative Coupling of Methane

Article abstract of DOI:10.1246/bcsj.66.1799

A voluminous composite oxide of BaLa2O4 was prepared by kneading powders of Ba(OH)2*8H2O (A) and La(NO3)3*6H2O (B) with a small amount of water, followed by pyrolysis at 1100 deg C.The resulting material (apparent volume of ca. 3 cm³ g^-1) was found to be effective as a catalyst for the oxidative coupling of methane to ethane and ethylene.The preparative conditions of the voluminous BaLa2O4 catalyst and these effects on the C2 formation were investigated.When reagents A and B were mixed with each other at 33 atom-percent Ba and then calcined for 10 min at 1100 deg C, the BaLa2O4 composite oxide was most advantageously produced and a high C2 yield of ca. 19percent was reproducibly obtained over a non-pressed or voluminous catalyst.The high surface basicity and macro-porous structure of the voluminous BaLa2O4 catalyst, which were responsible for its high C2 yield, are discussed.