Lesi sihloko sibuyekezwe ngokuhambisana nezinqubo nezinqubomgomo zokuhlela zeSayensi X. Abahleli bagcizelele lezi zimfanelo ezilandelayo ngenkathi beqinisekisa ubuqotho bokuqukethwe:
Ukushintsha kwesimo sezulu kuyinkinga enkulu edinga ukuqalwa emhlabeni wonke. Amazwe emhlabeni wonke athuthukisa izinqubomgomo zokunciphisa imiphumela yokufudumala komhlaba kanye nokushintsha kwesimo sezulu. Isibonelo, i-European Union iphakamisa isethi ephelele yeziqondiso zokufeza ukungathathi hlangothi kwesimo sezulu ngo-2050. Ngokufanayo, i-European Green Deal ibeka phambili ukunciphisa ukukhishwa kwamagesi abangela ukushisa.
Ukubamba i-carbon dioxide ekhishwayo (i-CO2) nokuyiguqula ngamakhemikhali ibe imikhiqizo yezentengiselwano ewusizo kungenye yezindlela zokunciphisa ukufudumala komhlaba kanye nokunciphisa imiphumela yako. Ososayensi okwamanje bahlola ubuchwepheshe bokubamba nokusetshenziswa kwe-carbon dioxide (i-CCU) njengendlela ethembisayo yokwandisa ukugcinwa nokucubungula kwe-carbon dioxide ngezindleko eziphansi.
Kodwa-ke, ucwaningo lwe-CCU lomhlaba wonke lukhawulelwe kakhulu kuma-compound aguqulayo angaba ngu-20. Njengoba kunikezwe ukuhlukahluka kwemithombo yokukhishwa kwe-CO2, ukutholakala kohlu olubanzi lwama-compound kubalulekile, okuzodinga ucwaningo olujulile ngezinqubo ezingaguqula i-CO2 ngisho noma zisezingeni eliphansi.
Ithimba labacwaningi abavela eNyuvesi yaseChung-Ang yaseKorea lenza ucwaningo ngezinqubo ze-CCU ezisebenzisa imfucuza noma izinsiza zemvelo ezicebile njengezinto zokusetshenziswa ukuqinisekisa ukuthi ziyasebenza ngokwezomnotho.
Ithimba locwaningo eliholwa nguSolwazi Sungho Yoon kanye noSolwazi Ohlangene uChul-Jin Lee lisanda kushicilela ucwaningo oluxoxa ngokusetshenziswa kwe-carbon dioxide yezimboni kanye ne-dolomite, idwala elivamile nelivamile elicebile nge-calcium ne-magnesium, ukukhiqiza imikhiqizo emibili engaba khona kwezentengiselwano: i-calcium formate. kanye ne-magnesium oxide.
“Kukhona isithakazelo esikhulayo ekusebenziseni i-carbon dioxide ukukhiqiza imikhiqizo ebalulekile engasiza ekunciphiseni imiphumela yokushintsha kwesimo sezulu ngenkathi ikhiqiza izinzuzo zomnotho. Ngokuhlanganisa ukusabela kwe-carbon dioxide hydrogenation kanye nokusabela kwe-cation exchange, sithuthukise indlela yokuhlanzwa kwe-metal oxides kanye nezinqubo ngesikhathi esisodwa ukuze kukhiqizwe amafomethi abalulekile,” kusho uSolwazi Yin.
Ocwaningweni lwabo, ososayensi basebenzise i-catalyst (Ru/bpyTN-30-CTF) ukwengeza i-hydrogen ku-carbon dioxide, okwaholela emikhiqizweni emibili enenani elongeziwe: i-calcium formate kanye ne-magnesium oxide. I-Calcium formate, isithasiselo sikasimende, i-deicer, kanye nesithasiselo sokudla kwezilwane, nayo isetshenziswa ekushiseni isikhumba.
Ngokuphambene nalokho, i-magnesium oxide isetshenziswa kabanzi embonini yokwakha kanye neyokwelapha. Le nqubo ayigcini nje ngokuba nokwenzeka, kodwa futhi ishesha kakhulu, ikhiqiza umkhiqizo ngemizuzu emi-5 kuphela ekushiseni kwegumbi. Ngaphezu kwalokho, abacwaningi balinganisela ukuthi le nqubo inganciphisa amandla okufudumala komhlaba ngo-20% uma kuqhathaniswa nezindlela zendabuko zokukhiqiza i-calcium formate.
Ithimba liphinde lihlole ukuthi indlela yabo ingathatha indawo yezindlela zokukhiqiza ezikhona ngokutadisha umthelela wayo kwezemvelo kanye nokusebenza kahle kwezomnotho. “Ngokusekelwe emiphumeleni, singasho ukuthi indlela yethu iyindlela engcono kakhulu yokuguqula i-carbon dioxide engathatha indawo yezindlela zendabuko futhi isize ekunciphiseni ukukhishwa kwe-carbon dioxide yezimboni,” kuchaza uSolwazi Yin.
Nakuba ukuguqula i-carbon dioxide ibe imikhiqizo ewusizo kuzwakala kuthembisa, lezi zinqubo akulula ngaso sonke isikhathi ukuzikhulisa. Ubuchwepheshe obuningi be-CCU abukakathengiswa ngoba ukusebenza kwabo kwezomnotho kuphansi uma kuqhathaniswa nezinqubo ezivamile zezentengiselwano. “Sidinga ukuhlanganisa inqubo ye-CCU nokusetshenziswa kabusha kwemfucuza ukuze siyenze ibe nenzuzo emvelweni nakwezomnotho. Lokhu kungasiza ekufinyeleleni imigomo yokukhishwa kwegesi okungenayo igesi esikhathini esizayo,” kuphetha uDkt. Lee.
Ulwazi olwengeziwe: Hayoung Yoon et al., Ukuguqula i-Magnesium kanye ne-Calcium Ion Dynamics ku-Dolomite ibe yimikhiqizo ewusizo enenani elengeziwe kusetshenziswa i-CO2, i-Journal of Chemical Engineering (2023). I-DOI: 10.1016/j.cej.2023.143684
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