NOVELTY - A feed gas mixture having oxygen-having gas and hydrocarbon feedstock is preheated in heat exchanger (14), and introduced to reactor (13) having catalyst structure. The structure has monolithic metal catalyst (11) and electrically heated catalyst (10). Catalyst (10) ignites partial oxidation reaction of mixture, and ignited mixture is passed through metal catalyst to convert into hydrogen and carbon monoxide.    USE - For converting hydrocarbon fuel into carbon monoxide and hydrogen used for fuel cell, small-scale hydrogen generator, gasoline internal combustion engine and pollution treatment device.    ADVANTAGE - The hydrocarbon fuel is completely converted into hydrogen and hydrogen monoxide with high selectivity and high yield by preheating the feed mixture. The monolithic metal catalyst has high thermal conductivity, and hence reduces formation of hot spots and increases durability of catalyst during repeated use.    DETAILED DESCRIPTION - A feed gas mixture comprising oxygen-containing gas and hydrocarbon feedstock having methane, natural gas, liquid petroleum gas (LPG), naphtha, gasoline and diesel oil is passed to a heat exchanger at room temperature. The feed gas mixture is preheated using a hot product gas stream and introduced to a reactor having a catalyst structure. The catalyst structure comprises a supported noble metal catalyst washed-coated on a monolithic metal, and an electrically heated catalyst. The electrically heated catalyst ignites partial oxidation reaction of gas mixture, and the ignited feed gas mixture is passed through monolithic metal catalyst. The mixture is converted to hydrogen and carbon monoxide, and heated using heat of partial oxidation reaction. The heated product gas stream is passed through heat exchanger to provide heat to feed gas mixture at room temperature.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic view of catalytic partial oxidation reactor.    electrically heated catalyst (10)    monolithic metal catalyst (11)    high temperature insulation (12)    reactor (13)    heat exchanger (14)