Pono ea mefuta e 'meli ea li-catalyst, e nang le karolo ea khetla e tlosoa ho bontša bokahare. Sebaka se sesoeu se emela khetla ea silika, masoba ke li-pores. Likarolo tse botala bo khanyang li emela libaka tsa catalytic, tse ka ho le letšehali li nyane haholo ho feta tse ka ho le letona. Likhoele tse telele tse khubelu li emela liketane tsa polymer, 'me likhoele tse khutšoanyane ke lihlahisoa ka mor'a catalysis. Likhoele tsohle tse khuts'oane li tšoana ka boholo, tse emelang khetho e tsitsitseng ho pholletsa le mefuta e fapaneng ea li-catalyst. Ho feta moo, ho na le liketane tse nyane tse hlahisoang ke libaka tse nyane tsa catalyst hobane karabelo e hlaha kapele. Mokitlane: Setšoantšo se amoheloa ke Argonne National Laboratory, US Department of Energy
Litheknoloji tsa ho phahamisa lipolasetiki li ntse li tsoela pele ka mokhoa o sa tsoa ntlafatsoa oa ho pshatla lipolasetiki. Sehlopha sa bo-ramahlale ba etelletsoeng pele ke bo-ramahlale ba Ames Laboratory ba ile ba sibolla ntho ea pele ea ts'ebetso ea inorganic catalyst ka 2020 ho theha lipolasetiki tsa polyolefin ka limolek'hule tse ka sebelisoang ho etsa lihlahisoa tsa bohlokoa ho feta. Hona joale sehlopha se thehile le ho tiisa leano la ho potlakisa phetoho ntle le ho tela lihlahisoa tse lakatsehang.
Sesebelisoa sena se entsoe ke Wenyu Huang, rasaense oa Ames Laboratory. E na le likaroloana tsa platinum tse tšehelitsoeng holim'a silika e tiileng ea silika 'me e pota-potiloe ke khetla ea silika e nang le masoba a junifomo a fanang ka phihlello ea libaka tsa catalytic. Kakaretso ea polatinamo e hlokahalang e nyenyane haholo, e leng ea bohlokoa ka lebaka la theko e phahameng ea platinum le phepelo e fokolang. Nakong ea liteko tsa deconstruction, liketane tse telele tsa polymer li kenella ka har'a li-pores ebe li ikopanya le libaka tsa catalytic, ebe liketane li rojoa likotoana tse nyane tseo e seng e le thepa ea polasetiki (bona setšoantšo se ka holimo bakeng sa lintlha tse ling).
Ho ea ka Aaron Sadow, rasaense oa Ames Lab le motsamaisi oa Institute for Cooperative Upcycling of Plastics (iCOUP), sehlopha se ile sa etsa mefuta e meraro ea li-catalyst. Phapang e 'ngoe le e' ngoe e ne e e-na le li-cores tse boholo bo lekanang le likhetla tse porous, empa li-diameter tse fapaneng tsa likaroloana tsa platinum, ho tloha ho 1.7 ho ea ho 2.9 ho isa ho 5.0 nm.
Bafuputsi ba ile ba nahana hore phapang ea boholo ba likaroloana tsa platinum e ne e tla ama bolelele ba liketane tsa lihlahisoa, kahoo likaroloana tse kholo tsa platinum li ka etsa liketane tse telele le tse nyane li tla etsa liketane tse khutšoanyane. Leha ho le joalo, sehlopha se ile sa fumana hore bolelele ba liketane tsa lihlahisoa li ne li lekana ka boholo ba li-catalyst tse tharo.
"Lingoliloeng, khetho ea liketso tsa carbon-carbon bond cleavage hangata e fapana ho ea ka boholo ba nanoparticles ea platinum. Ka ho beha platinamo botlaaseng ba masoba, re bone ho hong ho ikhethang, ”ho boletse Sadow.
Ho e-na le hoo, lebelo leo liketane li ileng tsa robeha ka lona ho limolek'hule tse nyenyane li ne li fapane ho li-catalysts tse tharo. Likaroloana tse kholoanyane tsa polatinamo li ile tsa itšoara ka ketane e telele ea polima butle ha tse nyenyane li ile tsa itšoara ka potlako. Sekhahla sena se eketsehileng se ka bakoa ke karolo e phahameng ea libaka tsa platinamo tse mathōko le likhutlong tse holim'a li-nanoparticles tse nyane. Liwebsaete tsena li sebetsa haholo ho petsola ketane ea polymer ho feta platinum e lifahlehong tsa likaroloana.
Ho latela Sadow, liphetho li bohlokoa hobane li bonts'a hore ts'ebetso e ka fetoloa ntle le khetho ea liketso tsena. "Joale, re na le ts'epo ea hore re ka etsa mokelikeli o sebetsang haholoanyane o ka hlafunang polymer ka potlako, ha re ntse re sebelisa li-parameter tsa catalyst ho letsetsa bolelele bo itseng ba ketane ea sehlahisoa," o boletse joalo.
Huang o hlalositse hore mofuta ona oa reactivity e kholo ea molek'hule ka har'a li-catalyst tse porous ka kakaretso ha li ithutoe haholo. Kahoo, lipatlisiso li bohlokoa bakeng sa ho utloisisa mahlale a mantlha le hore na e sebetsa joang bakeng sa ho phahamisa polasetiki.
"Re hloka ho utloisisa sistimi ho feta hobane re ntse re ithuta lintho tse ncha letsatsi le leng le le leng. Re ntse re hlahloba likarolo tse ling tseo re ka li tsamaisang ho eketsa sekhahla sa tlhahiso le ho fetola kabo ea lihlahisoa, ”ho boletse Huang. "Kahoo ho na le lintho tse ngata tse ncha lethathamong la rona tse emetseng hore re li fumane."
Tlhaloso: "Nanoparticles e laoloang ke boholo bo kenyelelitsoeng ka Mesoporous Architecture E Isang ho Sebetsang le ho Khetha Hydrogenolysis ea Polyolefins" ka Xun Wu, Akalanka Tennakoon, Ryan Yappert, Michaela Esveld, Magali S. Ferrandon, Ryan A. Hackler, Anne M. LaPointe, Andreas Heyden, Massimiliano Delferro, Baron Peters, Aaron D. Sadow le Wenyu Huang, 23 Hlakola 2022, Journal ea American Chemical Society.
DOI: 10.1021/jacs.1c11694
Patlisiso e entsoe ke Setsi sa Cooperative Upcycling of Plastics (iCOUP), se etelletsoeng pele ke Ames Laboratory. iCOUP ke Energy Frontier Research Center e nang le bo-rasaense ba tsoang Ames Laboratory, Argonne National Laboratory, UC Santa Barbara, Univesithi ea South Carolina, Univesithi ea Cornell, University ka leboea-bophirimela, le Univesithi ea Illinois Urbana-Champaign.
