Sesebelisoa se sebetsang hantle haholo se fetolang khase ea propane hore e be li-hydrocarbon tse boima haholo se entsoe ke King Abdullah University of Science and Technology oa Saudi Arabia. (KAUST) bafuputsi. E potlakisa karabelo ea lik'hemik'hale e tsejoang ka hore ke alkane metathesis, e ka sebelisoang ho hlahisa mafura a metsi.

Sehlomathiso se hlophisa bocha propane, e nang le liathomo tse tharo tsa k'habone, hore e be limolek'hule tse ling, joalo ka butane (e nang le likhabone tse 'ne), pentane (e nang le likhabone tse hlano) le ethane (e nang le likhabone tse peli). "Sepheo sa rona ke ho fetola li-alkane tsa boima ba limolek'hule tse tlase ho li-alkane tsa bohlokoa tsa diesel," ho boletse Manoja Samantaray oa KAUST Catalysis Center.

Bohareng ba li-catalyst ho na le metsoako ea litšepe tse peli, titanium le tungsten, tse khomaretsoeng holim'a silika ka liathomo tsa oksijene. Leano le sebelisitsoeng e ne e le catalysis by design. Liphuputso tse fetileng li bontšitse hore li-catalysts tsa monometallic li ne li sebetsa mesebetsing e 'meli: alkane ho olefin ebe olefin metathesis. Titanium e khethiloe ka lebaka la bokhoni ba eona ba ho kenya CH bond ea parafine ho e fetola olefins, 'me tungsten e ile ea khethoa bakeng sa mosebetsi oa eona o phahameng bakeng sa metathesis ea olefin.

E le ho etsa catalyst, sehlopha se futhumatsa silica ho tlosa metsi a mangata kamoo ho ka khonehang ebe se eketsa hexamethyl tungsten le tetraneopentyl titanium, ho etsa phofo e mosehla o khanyang. Bafuputsi ba ithutile catalyst ba sebelisa spectroscopy ea nuclear magnetic resonance (NMR) ho bontša hore liathomo tsa tungsten le titanium li lutse haufi haholo holim'a silika, mohlomong li le haufi le ≈0.5 nanometers.

Bafuputsi, ba etelletsoeng ke Mookameli oa setsi sa Jean-Marie Basset, ba ile ba leka sekontiri ka ho se futhumatsa ho 150 ° C ka propane ka matsatsi a mararo. Ka mor'a ho ntlafatsa maemo a karabelo - ka mohlala, ka ho lumella propane hore e tsoele pele ho phalla holim'a sesebelisoa - ba ile ba fumana hore lihlahisoa tse ka sehloohong tsa karabelo e ne e le ethane le butane le hore para e 'ngoe le e 'ngoe ea liathomo tsa tungsten le titanium li ka etsa hore ho be le karolelano ea lipotoloho tse 10 000 pele ho moo. ho lahleheloa ke mosebetsi oa bona. "Nomoro ena ea phetoho" ke eona e phahameng ka ho fetisisa e kileng ea tlalehoa bakeng sa karabelo ea propane metathesis.

Katleho ena ea catalysis ka moralo, bafuputsi ba sisinya, e bakoa ke phello e lebelletsoeng ea tšebelisano lipakeng tsa litšepe tse peli. Taba ea pele, athomo ea titanium e tlosa liathomo tsa haedrojene ho propane ho etsa propene ebe athomo ea boahelani ea tungsten e pshatla propene ka bond ea eona ea carbon-carbon habeli, e etsa likhechana tse ka kopanang hape ho ba li-hydrocarbon tse ling. Bafuputsi ba fumane hape hore li-catalyst powders tse nang le tungsten kapa titanium feela li sebetsa hampe haholo; le ha li-powders tsena tse peli li ne li kopantsoe 'meleng, ts'ebetso ea tsona e ne e sa lumellane le ts'ebetso ea tšebelisano-'moho.

Sehlopha se ts'epa hore se tla rala sesebelisoa se betere le ho feta se nang le palo e phahameng ea tšebetso, le bophelo bo bolelele. "Re lumela hore haufinyane, indasteri e ka sebelisa mokhoa oa rona oa ho hlahisa li-alkane tsa diesel le ho etsa catalysis ka moralo," ho boletse Samantaray.