Lisefa tsa molek'huleke lisebelisoa tsa bohlokoa bakeng sa karohano ea khase le metsi le tlhoekiso liindastering tse fapaneng. Ke li-crystalline metalloaluminosilicates tse nang le li-pores tse tšoanang tse khethang limolek'hule ho latela boholo le sebopeho sa tsona. Themokhoa oa ho etsa li-sieve tsa molek'hulee kenyelletsa mehato e mengata e rarahaneng ho netefatsa tlhahiso ea lisebelisoa tsa boleng bo phahameng tse nang le boholo bo itseng ba pore le thepa.
Tlhahiso ea li-sieve tsa limolek'hule e qala ka khetho ea lisebelisoa tse tala, ho kenyelletsa silicate ea sodium, alumina le metsi. Lisebelisoa tsena li tsoakoa ka tekanyo e nepahetseng ho etsa gel ea homogeneous, e ntan'o kenngoa ts'ebetsong ea hydrothermal synthesis. Mohato ona, gel e futhumetse ho mocheso o phahameng ka pel'a lintho tsa alkaline ho khothalletsa ho thehoa ha sebopeho sa kristale se nang le li-pores tse tšoanang.
Mokhahlelo o latelang oa bohlokoa ts'ebetsong ea tlhahiso ke phapanyetsano ea ion, e kenyelletsang ho fetola li-ion tsa sodium ka har'a sebopeho sa kristale le li-cation tse ling tse kang calcium, potasiamo kapa magnesium. Ts'ebetso ena ea phapanyetsano ea ion e bohlokoa bakeng sa ho laola ts'ebetso ea li-sieve tsa limolek'hule, ho kenyeletsoa bokhoni ba adsorption le khetho. Mofuta oa cation o sebelisoang bakeng sa phapanyetsano ea ion o itšetlehile ka litlhoko tse khethehileng tsa kopo ea sieve ea molek'hule.
Ka mor'a phapanyetsano ea ion, li-sieve tsa limolek'hule li etsa letoto la mehato ea ho hlatsoa le ho omisa ho tlosa litšila leha e le life le lik'hemik'hale tse setseng ho tloha ts'ebetsong ea tlhahiso. Sena se tiisa hore sehlahisoa sa ho qetela se kopana le litekanyetso tse thata tsa bohloeki tse hlokahalang bakeng sa lits'ebetso tsa indasteri. Ka mor'a hore mokhoa oa ho hlatsoa le ho omisa o phethiloe, li-sieve tsa molek'hule li calcined ka mocheso o phahameng ho tsitsisa sebopeho sa kristale le ho tlosa metsoako leha e le efe e setseng ea lintho tse phelang.
Mohato oa ho qetela oa ts'ebetso ea tlhahiso o kenyelletsa ts'ebetso ea li-sieve tsa molek'hule ho li lokisetsa lits'ebetso tsa adsorption. Ts'ebetso ena ea ts'ebetso hangata e kenyelletsa ho futhumatsasieve ea molek'huleka mocheso o phahameng ho tlosa mongobo le ho ntlafatsa thepa ea eona ea adsorption. Nako le mocheso oa ts'ebetso ea ts'ebetso li laoloa ka hloko ho fihlela boholo bo lakatsehang ba pore le sebaka se kaholimo sa sieve ea molek'hule.
Li-sieve tsa limolek'hule li fumaneha ka boholo bo fapaneng ba pore, ho kenyeletsoa 3A, 4A le 5A, e 'ngoe le e' ngoe e loketse lits'ebetso tse ikhethileng. Ka mohlala,3Lisefa tsa molek'hulehangata li sebelisoa bakeng sa dehydration ea likhase le metsi, ha a ntse a4A le 5A li-sieve tsa molek'huleli khethoa bakeng sa ho khantša limolek'hule tse kholoanyane le ho tlosa litšila tse kang metsi le carbon dioxide.
Ka bokhutšoanyane, tlhahiso ea li-sieve tsa molek'hule ke mokhoa o rarahaneng le o rarahaneng o kenyelletsang mehato e mengata ea bohlokoa, ho kenyelletsa le hydrothermal synthesis, phapanyetsano ea ion, ho hlatsoa, ho omisa, ho bala le ho kenya tšebetsong. Mehato ena e laoloa ka hloko ho hlahisali-sieve tsa molek'hulee nang le thepa e ikhethileng le boholo ba pore ho fihlela litlhoko tse fapaneng tsa liindasteri tse kang petrochemical, meriana le ts'ebetso ea khase ea tlhaho. Boleng bo phahamenglisieve tsa molek'hule tse entsoengka bahlahisi ba nang le botumo bo botle ba phetha karolo ea bohlokoa ho fihlelleng mekhoa e sebetsang ea karohano le tlhoekiso lits'ebetsong tse fapaneng tsa indasteri.
Nako ea poso: Apr-19-2024