Hydrogen generator and hydrogenation apparatus

The efficiency of dehydrogenation and that of hydrogenation are improved. A hydrogen generator for generating hydrogen by dehydrogenation of organic hydrides in the presence of a catalyst is characterized by comprising a reactor vessel of a multi-tubular structure having a region for supplying fuel to generate heat necessary for dehydrogenation, the region containing a combustion catalyst for combusting fuel, and a region containing a dehydrogenation catalyst necessary for dehydrogenation, the regions being arranged radially side by side with a wall separating them. A hydrogenation apparatus which synthesizes organic hydrides by way of hydrogenation of unsaturated hydrocarbons in the presence of a catalyst is characterized by comprising a reactor vessel of a multi-tubular structure having a region for removing the heat generated by hydrogenation and a region containing a hydrogenation catalyst necessary for hydrogenation, the regions being arranged radially side by side with a wall separating them.