NOVELTY - The reformer has a plasma reactor (61) for producing a reformat from a set of reactants comprising a primary fuel, air and water. A catalytic burner (72) heats the reactants in a sealed duct (215) before introducing the reactants in the plasma reactor and extends around the plasma reactor. A double wall (210) of the reactor extends between an external wall (212`) of the reactor and the catalytic burner. A conduit (216) connects an outlet (217) of the duct and an inlet (218) of the double wall.    USE - Used in an electricity generator or a power module of a motor vehicle for transforming primary fuel e.g. petrol, diesel, naphtha, alcohol, ester and hydrocarbon, into hydrogen rich reformat to reduce nitrogen oxide and/or particle emitted by an internal combustion engine e.g. thermal engine, of the vehicle (claimed), where the reformat is utilized by fuel cell of the generator to generate electrical energy for supplying electrical consumer e.g. electric traction motor, of the vehicle, and for pollution control of catalytic converter.    ADVANTAGE - The catalytic burner permits to obtain efficient heating of the reactants and reduces the rate of combustion residue. The catalytic burner permits a well controlled combustion so that the generation of additional undesirable gases is eliminated. The catalytic burner permits a controlled combustion at a temperature less than that resulting from flame combustion, thus permitting the materials surrounding the burner to undergo reduced thermo-mechanical constraints, while avoiding overheating of the reactants intended to the reactor, and increasing the durability of the reactor. The reformer permits to generate during cold start, in rapid manner, the hydrogen which permits to reduce the nitrogen oxide even without the usage of catalyst and even at low temperature.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of a plasma reformer.    Plasma reactor (61)    Catalytic burner (72)    Double wall (210)    External wall (212`)    Duct (215)    Conduit (216)    Outlet (217)    Inlet (218)