Apparatus for converting a feed gas into a product gas

An apparatus for converting a feed gas having components for reaction into a product gas, the apparatus comprising:

• at least one reactor with a reaction chamber which is provided with an inlet opening for feed gas and an outlet opening for product gas and which is bounded by the inner wall of an outer tube closed at a first outer end and the outer wall of an inner tube received coaxially in this outer tube and provided at both its outer ends with openings, which reactor is provided with an inlet chamber which is in open connection with the at least one inlet opening and with an outlet chamber in which the at least one outlet opening debouches, wherein a first wall of the outlet chamber encloses the outer tube and extends therefrom;
• a second wall of the outlet chamber lying opposite the first wall encloses the outer tube and extends therefrom, wherein
• the inlet chamber is bounded by the second wall of the outlet chamber and a third wall which lies opposite this second wall, encloses the outer tube and extends therefrom, wherein the inlet opening is formed in the wall of the outer tube.