NOVELTY - A combined process chemical reactor for producing ammonia, comprises a reaction chamber; hydrogen permeable structure between upper and lower cavities of reaction chamber; mechanisms supplying air and gaseous hydrocarbon mixture to lower reaction cavity; an oxidation structure; mechanism for transferring nitrogen from lower to upper reactor cavity; and a mechanism for transferring exothermic energy from upper to lower reaction cavity.    USE - For producing ammonia by reacting hydrogen and nitrogen (claimed).    ADVANTAGE - The inventive chemical reactor produces ammonia with improved efficiency and yield, and with reduced amounts of carbon dioxide. It provides a way for converting a fossil fuel, such as natural gas, to ammonia without the release of greenhouse gases.    DETAILED DESCRIPTION - A combined process chemical reactor for the production of ammonia by the reaction of hydrogen and nitrogen, comprises:    (A) a reaction chamber (1) with both an upper reaction cavity (2) and a lower reaction cavity (3);    (B) a hydrogen permeable structure (4) for separating the upper and lower cavities;    (C) a first mechanism (5) for supplying a gaseous hydrocarbon mixture into the lower reaction cavity;    (D) a second mechanism for supplying air into the lower reaction cavity;    (E) an oxidation structure within the lower cavity for burning the air;    (F) mechanism for transferring nitrogen from the lower reactor cavity to the upper reactor cavity for catalytic conversion to ammonia in the presence of hydrogen; and    (G) a mechanism for transferring exothermic energy from the upper reaction cavity to the lower reaction cavity where the additional energy need of the lower of the cavities is reduced.    DESCRIPTION OF DRAWING(S) - The figure shows a combined process chemical reactor.    Reaction chamber (1)    Upper reaction cavity (2)    Lower reaction cavity (3)    Hydrogen permeable structure (4)    First mechanism for supplying gaseous hydrocarbon mixture (5)