NOVELTY - Reformer comprises at least one reformer reactor unit having a space-confining wall with external and internal surfaces, at least a section of wall and space confined thus defining a reforming reaction zone, an inlet end and associated inlet for admission of a flow of gaseous reforming reactant to the reaction zone, an outlet end and associated outlet for outflow of hydrogen-rich reformate, the section of the wall comprises perovskite as structural component, such wall section is gas-permeable and allows reactant to diffuse in it and hydrogen-rich reformate to diffuse from it.    USE - The reformer: is useful for reforming fuel and converting reformable fuel including liquid fuel e.g. methanol, ethanol, naphtha, gasoline, kerosene, jet fuel, diesel or biodiesel, and gaseous fuel including methane, ethane, propane, butane, isobutane, ethylene. propylene, butylene, isobutylene, dimethyl ether to hydrogen rich-reformate; and includes a pervoskite-containing wall, which is useful for catalyzing reforming reactions including steam reforming, autothermal reforming and partial oxidation reforming.    ADVANTAGE - The reformer includes a pervoskite containing wall structure that exhibits excellent mechanical and thermal properties even in high exothermic reforming reaction zones including catalytic partial oxidation reformers.    DETAILED DESCRIPTION - Reformer comprises at least one reformer reactor unit having a space-confining wall with external and internal surfaces, at least a section of the wall and space confined thus defining a reforming reaction zone, an inlet end and associated inlet for admission of a flow of gaseous reforming reactant to the reforming reaction zone, an outlet end and associated outlet for outflow of hydrogen-rich reformate produced in the reforming reaction zone, the section of the wall corresponding to the reforming reaction zone comprises perovskite as a structural component, such wall section is gas-permeable and allows gaseous reforming reactant to diffuse in it and hydrogen-rich reformate to diffuse from it.    DESCRIPTION OF DRAWING(S) - The figure illustrates a liquid and gaseous fuel catalytic partial oxidation reformers having many catalytic partial oxidation reformer reactor units.    Catalytic partial oxidation reformer (100)    Centrifugal blower (102)    Conduit (103)    Catalytic partial oxidation reactor units (109)    Catalytic partial oxidation reaction zone (110)