NOVELTY - Catalyst combustor has inlet (243) and outlet partitions (244) which separate the flow path of the combustion catalyst in the inlet (241) and outlet (242) respectively. At least three flow paths (S1,S2,S3) for the catalyst are formed in the inside of the partitions. The inlet and outlet controlling valves (245,246) are provided to open-close the inlet side flow path and outlet side stream line.    USE - For a fuel reformer.    ADVANTAGE - The temperature rise of the combustion catalyst portion is done uniformly in short time using flow control valves. The amount of unburnt methanol is reduced. The circulation of heating air, methanol mixed air is performed quickly. The heat release from center portion to combustion catalyst portion is done uniformly in short time with simple structure.    DETAILED DESCRIPTION - The catalyst combustion portion has internal flow path and a heater (22) is provided in the inlet of combustion catalyst portion. The inlet flow controlling valve blocks the flow paths (S2,S3) and outlet controlling valve blocks the flow path (S1). The cross-section of the flow paths are equal or formed in such a way that their cross-section increases gradually. The internal diameter of cylindrical outlet partition (244) is larger or smaller than the inlet partition (243). The inlet and outlet controlling valves (245,246) block the outer or inner sides of inner and outlet partitions respectively. The partitions are formed in the shape of sheets with installation space of outlet partition larger than or narrower than the inlet partition. Each inlet and outlet partitions are formed such that partition (243) is from the center of combustion catalyst portion. Each controlling valve blocks the area where opening area of the inlet and outlet is large.    DESCRIPTION OF DRAWING(S) - The figure shows the sectional drawing of catalyst combustor.    Heater (22)    Inlet (241)    Outlet (242)    Inlet partition (243)    Outlet partition (244)    Inlet and outlet controlling valves (245,246)    Flow paths (S1,S2,S3)