Abstract: The reaction mechanism on anode surface of membrane reactor was studied and proposed. The effects of catalyst micron on anode surface and catalyst-bed in membrane reactor were concluded. The “Catalystic dissociation mechanism” was proposed as the main reason for the increment of oxygen permeation in CH₄-reforming membrane reactor; the reactive activity sequence of compositions on membrane surface was H₂>CO>CH₄; the main reaction on anode surface would turned into oxidation of H₂ or CO from directly oxidation of CH₄ and the oxygen permeation of membrane would be significantly increased as soon as the H₂ or CO was added into CH₄ gas; and the “lattice-oxygen-ion pattern” dominate the oxidated reaction on the membrane surface.

Key words: BaCo_0.7Fe_0.2Nb_0.1O_3-δ, Membrane reactor, Surface reaction mechanics, Lattice oxygen