PORCELAIN COMPOSITION, COMPOSITE MATERIAL COMPRISING CATALYST AND CERAMIC, FILM REACTOR, METHOD FOR PRODUCING SYNTHETIC GAS, APPARATUS FOR PRODUCING SYNTHETIC GAS AND METHOD FOR ACTIVATING CATALYST

A porous catalyst layer containing mixed conducting oxide is contiguous to a second surface (1a) of a selective oxygen-permeable dense continuous layer (1) containing mixed conducting oxide. A porous intermediate catalyst layer (3) containing mixed conducting oxide is contiguous to a first layer (1b) of the dense continuous layer (1). A porous reactive catalyst layer (4) provided with a metal catalyst and a support is contiguous to the porous intermediate catalyst layer (3) in a manner to sandwich between the dense continuous layer (1) and the porous reactive catalyst layer (4).