(EP1024881-A1)      Purification of fuel feedstream involves: (a) reforming the feedstream and (b) separating carbon dioxide from the feedstream with a nonporous, carbon dioxide selectively permeable membrane to leave a feedstream enriched in hydrogen. Also claimed are (1) a system for converting a fuel feedstream to hydrogen rich and COx deficient feedstream comprises a reformer, a water gas shifter and a carbon dioxide selective membrane reactor, and a methanator; (2) A composition comprises a hydrophilic polymer and 10-80 wt.% ammonium halide salt(s) of formula R4N+X-, where R = hydrogen or 1-4C alkyl, X = fluoride, chloride, bromide or iodide; and (3)The production of the nonporous membrane involves forming a casting solution of solvent, hydrophilic polymer and ammonium halide salt(s), casting the solution on a substrate and evaporating the solvent.    USE -   For use in purification of fuel feedstream e.g. of gasoline, diesel or methanol, and production of hydrogen enriched fuel useful for fuel cells.    ADVANTAGE -   Carbon dioxide selective membrane avoids the need for a compressor and can be carried out on board a vehicle.    (JP2001511430-W)      Purification of fuel feedstream involves: (a) reforming the feedstream and (b) separating carbon dioxide from the feedstream with a nonporous, carbon dioxide selectively permeable membrane to leave a feedstream enriched in hydrogen. Also claimed are (1) a system for converting a fuel feedstream to hydrogen rich and COx deficient feedstream comprises a reformer, a water gas shifter and a carbon dioxide selective membrane reactor, and a methanator; (2) A composition comprises a hydrophilic polymer and 10-80 wt.% ammonium halide salt(s) of formula R4N+X-, where R = hydrogen or 1-4C alkyl, X = fluoride, chloride, bromide or iodide; and (3)The production of the nonporous membrane involves forming a casting solution of solvent, hydrophilic polymer and ammonium halide salt(s), casting the solution on a substrate and evaporating the solvent.    USE -   For use in purification of fuel feedstream e.g. of gasoline, diesel or methanol, and production of hydrogen enriched fuel useful for fuel cells.    ADVANTAGE -   Carbon dioxide selective membrane avoids the need for a compressor and can be carried out on board a vehicle.