NOVELTY - A nanoparticles ceria based catalyst (A) comprises: cerium dioxide, at least one metal or metal oxide, and at least one noble metal.    USE - As nanoparticles ceria based catalyst; useful in reformer tube, for reformer; which is useful in system for production of hydrogen from raw gas comprising water-gas shift reactor (claimed). The hydrogen is useful for polymer electrolyte membrane (PEM) fuel-cells.    ADVANTAGE - The reformer comprising nanoparticles ceria based catalyst is suitable for forming reformed gas; and the water-gas shift reactor comprising nanoparticles ceria based catalyst is suitable for production of hydrogen from raw gas in water-gas shift reactor. The apparatus and process allow for reforming raw gas into reformed gas or syn-gas, converting reformed gas into hydrogen and carbon dioxide by water-gas shift reaction and separating/purifying hydrogen produced into high purity hydrogen. In systems known in the art, hydrogen is produced in large quantities as waste gas from the production of medium to large quantities of chloro-alkali plants, through natural gas steam reforming and in small quantities using electrolysis. None of the known systems with the exception of electrolysis when electricity used is produced from a renewable source are using renewable feedstock and/or energy source. The complete cycle energy efficiency of hydrogen production by the process and/or system involving use of nanoparticles ceria based catalyst, compares itself very favorably with hydrogen produced by electrolysis. The nanoparticles ceria based catalyst is used for water-gas shift reaction. The catalyst which does not follow the Gibbs equilibrium curve, permits the water-gas reaction to be completed in a single shift temperature step rather than a high temperature followed by a low temperature step as usually seen in the art. Pilot testing of catalyst in water-gas shift reaction conditions has demonstrated that a carbon monoxide concentration of less than 0.9% is achieved in one single shift reaction step. The rate of CO conversion as a function of temperature for the catalyst in the water-gas shift reaction is studied and the rate at 300 degrees C is 12 micromoles/g/second. At 300 plus minus 25 degrees C over 99.5% conversion of CO is achieved with the catalyst at 280-320 degrees C. The catalyst gives 100% hydrogen selectivity, with levels of impurities observed such as methane, methanol and aldehydes of below 2 ppm. The catalyst can also be used in preferential oxidation (PROX reaction) of CO to remove residual CO. CO oxidation occurs at room temperature in the presence of the catalyst.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a tube for a reformer comprising: an outer surface coated with the catalyst (A); a porous pipe at a first end within the tube, defining an outer surface, a length, and an inner passage capped at a second end opposite the first end; and an annular passage between the pipe and the tube;    (2) a reformer comprising: several tubes, each of which comprises an outer surface coated with the catalyst (A); each of the tubes has a porous pipe at its first end within the tube, where pipe defines outer surface, length and inner passage capped at a second end opposite the first end, and an annular passage between the pipe and the tube; at least one inlet in communication with the reformer to introduce a raw gas to be reformed; and at least one reformed gas outlet in communication with the reformer to discharge a reformed gas to be produced;    (3) a system for the production of hydrogen from a raw gas comprising: a raw gas source; a reformer (116) including an inlet in communication with the raw gas source for receiving the raw gas, several tubes (126), each of which comprises an outer surface coated with the catalyst (A) to promote a chemical reaction with the raw gas for producing a reformed gas, and an outlet for discharging the reformed gas produced; a water-gas shift reactor including an inlet in communication with the outlet of the reformer for receiving the reformed gas, the catalyst for reacting the reformed gas into a mixture of hydrogen and carbon dioxide in one single shift temperature reaction step, and an outlet for discharging the mixture hydrogen and carbon dioxide; and a separation system for the separation of the hydrogen from the carbon dioxide including an inlet in communication with the water shift reactor outlet for receiving the mixture of hydrogen and carbon dioxide, an outlet for discharging the hydrogen, and an outlet for discharging the carbon dioxide;    (4) a water-gas shift reactor comprising: a vessel having at least one inlet and at least one outlet; a packed bed within the vessel; the catalyst (A) located within the packed bed for reacting in a single shift temperature reaction step a reformed gas into a mixture of hydrogen and carbon dioxide; at least one inlet is in communication with the vessel for receiving the reformed gas; and at least one outlet in communication with the vessel for discharging the mixture of hydrogen and carbon dioxide; and    (5) process (P1) for the production of hydrogen from a raw gas involving: (a) providing a raw gas; (b) introducing the raw gas into a reformer having several tubes, each of which comprises an outer surface coated with the catalyst (A) and a flameless combustion within each of the tubes for heating the coated outer surface of each tubes; (c) reforming the raw gas within the reformer by contacting the raw gas with the heated coated outer surface to promote a chemical reaction with the raw gas producing a reformed gas; (d) reacting the reformed gas produced in the step (c) in the presence of the catalyst in a single shift temperature step producing a mixture of hydrogen gas and carbon dioxide; and (e) separating hydrogen from carbon dioxide produced in the step (d).    DESCRIPTION OF DRAWING(S) - The figure shows detailed view of the reformer of the system for production of hydrogen from raw gas.    Reformer (116)    Flanged tube bundle (118)    Reformer tubes (126)    Reformer tube bundle flanges (128)    Inner passage/pipe of reformer tubes (132)    Reformer inlet dish head inlet nozzle (142)