Abstract:

The composition and structures of Li-Ti-La minxed oxides as well as their catalytic activity for methane oxidative coupling have been studied by means of XRD 、XPS、IR、SEM、 and so on. The results indicate that by changing x value in Li La_(1-x)Ti_xO_2 oxides phases of La_2O_3、 La-Ti_(1-y)Li_yO_(3-λ)、 Li_2TiO_3 and La_(0.66)TiO_(2.993) are formd. Among them the complex oalde LaTi1-y LiyO3-λ is the active phase for methane oxidative coupling due to the formation of active site Li~+-O~--Ti~(3+), while Li_(1.33)Ti_(1.66)O_4 is not active for both methane oxidative coupling and deep oxidation.

Key words: Methane, Oxidative coupling, Catalyst, Titanium-lanthanum-lithium