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INTRODUCTIONMostoftheoildailyextractedisconsumedintransportation(approximately66.6%inAmerica)http://www.bts.gov/publications/national_transportation_statistics/html/table_04_03.html.Oftheenergyusedinthissector,approximately65%isconsumedbyHYPERLINK"http://en.wikipedia.org/wiki/Gasoline"\o"Gasoline"gasoline-poweredvehicles.HYPERLINK"http://en.wikipedia.org/wiki/Diesel"\o"Diesel"Diesel-poweredtransport(trains,merchantships,heavytrucks,etc.)consumesabout20%,andairtrafficconsumesmostoftheremaining15%USDept.ofEnergy,"HYPERLINK"http://www.eia.doe.gov/oiaf/aeo/pdf/appendixes.pdf"\o"http://www.eia.doe.gov/oiaf/aeo/pdf/appendixes.pdf"AnnualEnergyOutlook"(February2006),TableA2.InItaly,civilmobilityaccountsforabout74%oftotalconsumption,halfofwhichcorrespondingtoabout30%ofthenationaltotalconsumptionontransportation,insideurbanandsuburbanzones.Intheseenvironmenttherefore,caremissionsrepresentsthemainpollutionsource.Hydrogencars,byeliminatingCO2emissions,coulddrasticallyreduceinshorttimespollution,especiallyinourlivingareas.Themainobstacle,hinderingtheintroductionintothemarketofhydrogencars,isrepresentedbythelowefficiencyofhydrogenstoragesystem.Figure1.Energydensity,bothvolumetricandgravimetric,ofvarioussystemsforhydrogenstorage.The2010and2015DOEtargetscorrespondto6.0and9.0%wt.Wecanassumethatafuelcellequippedcarwouldrunabout100kmperkgofhydrogenburned.Consequentlyastandardof400kmwouldbefulfilledby4kgofhydrogen.Fig.1showsvariousstoragesystemsdimensionedtodeliver4kgofhydrogen.Amongthedifferentstoragesystems,thehydrolysisofhydrideseemsthebestpromisingone(Fig.2).Thereactioncanberepresentedas:2MeHn+nH2O→Me2On+2nH2(1)Thehydrideshouldnecessarilyberegeneratedoff-board.AmongthedifferentmetalhydrideNaBH4showsahydrogencontenthigherthan10%wt.Thehighhydrogencontentandthesimplicityofsynthesismakesthesaltaperfectcandidatetostorehydrogenformobileapplication.AsafuelNaBH4islessflammableandlessvolatilethanHYPERLINK"http://en.wikipedia.org/wiki/Petrol"\o"Petrol"gasoline.
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