An apparatus for an endothermic reaction of a gas such as steam reforming having a cylindrical vessel which is provided therein a fuel gas supply room, a combustion catalyst holding wall, a flue gas passage room, and a reaction room, all of which are cylindrical or annular and coaxially piled in this...http://www.google.co.uk/patents/US4849187?utm_source=gb-gplus-sharePatent US4849187 - Steam reforming apparatus
