NOVELTY - A process (P1) for reforming a hydrocarbon involves: catalytically reforming a first portion of a hydrocarbon feed in the presence of steam and excess air in a first catalyst zone to produce a first effluent; thermally reforming a second portion of the hydrocarbon feed in the presence of steam in a second catalyst zone to form a second effluent; combining the first and second effluent to form a mixed effluent; indirectly exchanging heat from the mixed effluent to the second catalyst zone; and shift converting the mixed effluent to obtain a carbon dioxide-rich gas.    USE - For production of synthesis gas (syngas) (claimed).    ADVANTAGE - The process produces hydrogen without using high capital cost equipment such as steam-methane reformer and air separation plant and low temperature distillation process with low energy consumption, easy operation, and reduced nitric oxides and carbon dioxide emissions (56% less than a comparable steam and reforming hydrogen plant of the same capacity). The process is thus an attractive option for construction of new hydrogen production facilities where excess nitrogen is desired or can be tolerated.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) generating electrical current involving process (P1) and supplying the hydrogen-rich product gas to a fuel cell;    (2) hydrotreating process involving (P1) and supplying the hydrogen-rich product gas to a hydrotreater; and    (3) system for reforming a hydrocarbon involving: a first reactor comprising a catalyst zone disposed beneath a burner section; a second reactor comprising several tubes having a catalyst for reforming a hydrocarbon located either in the tubes or outside the tubes; and a shift converter using units for catalytically reforming a first portion of a hydrocarbon feed, for thermally reforming a second portion of the hydrocarbon feed and for shift converting the mixed effluent to obtain a carbon dioxide-rich gas.    DESCRIPTION OF DRAWING(S) - The figure shows a simplified schematic process flow diagram of the autothermal reformer (ATR)-reforming exchanger process.    autothermal reforming reactor (10)    reforming exchanger (14)    catalyst tubes (24)    waste heat boiler (28)    shift section (30)    preheater. (38)