STUDIES OF MULTICOMPONENT COMPLEX OXIDE CATALYSTS FOR THE OXIDATIVE COUPLING OF METHANE Ⅲ CATALYSTS LiLa_(1-X)Ni_XO_(2-λ)(X=0-1)

The catalysts LiLa_(1-x)Ni_xO_(2-λ),(x=0-1)were examined systematically for the oxidativecoupling of methane,and the active phase La_2Ni_(1-y)Li_yO_(1-λ)was identified by means of XRD,IR,SEMand so on.A high C_2 yield of 21.5％ with a selectivity of 67.2％ at 1023 K was obtained.The activitytowards C_2 formation arised with the increasing of the amount of active sites,oxygen vacancies Vo,which were formed in the complex oxides La_2Ni_(1-y)Li_yO_(1-λ).