Imiphumela yomsebenzi ishicilelwe kumagazini we-nanomataltal. Ngesikhathi sokuhlanganiswa kwe-hydrogen, amagesi abamba ukushisa awakhiwa, futhi amaseli kaphethiloli asebenza ngesisekelo sawo akhiqiza ugesi ngokusebenza okuphezulu kakhulu, ngakho-ke i-hydrogen ibhekwa njengophethiloli othenjwe kakhulu.
Ukukhiqizwa kwanamuhla kwezimboni kususelwa ekuguqukeni okuhlanganyelwe kwegesi yemvelo kanye nomphunga wamanzi olwenziwe ku-1000 degrees Celsius, kepha indlela eyengeziwe ye-econ dioxius ye-methane, impahla eluhlaza lapho isebenza khona ama-greenhouse isebenza ngasikhathi sinye - CH4 ne-CO2. Ngeshwa, ama-catalysts wokuguqula ama-Steam ale nqubo ayakhiwa futhi abhujiswe, kanye nokusetshenziswa kwama-catalysts we-Universal kususelwa ku-Platinum Group Metals (PT, PD, RH) futhi akunakwenzeka ngezizathu ezahlukahlukene.
Umuntu othembisayo weCarbon Dioxide Conversion Carticsts nguMolybdenum Carbide (Mo2C). Umsebenzi wayo we-catalytic ekuphendukeni okubandakanya ama-hydrocarbons akhanyayo aqhathaniswa neplatinamu, futhi intengo iphansi kakhulu. Ngaphezu kwalokho, i-molybdenum carbide imelana nobuthi obujwayelekile be-catalytic - ama-compys e-carbon kanye namakhompiyutha aqukethe ama-sulfur, okwenza ama-catalysts asuselwe kuwo okuhlala isikhathi eside. Kodwa-ke, i-molybdenum carbide ayisatshalaliswa emvelweni futhi ingatholakala kuphela ngokungenziwa.
Ngendlela ye-metallurgical yendabuko, ihlelwe ngenxa yokutshala izinga lokushisa okude kwensimbi nekhabhoni, okuholela ekusetshenzisweni kwamandla amakhulu. Enye indlela evamile ukwehliswa kwe-thermostatic of molybdenum oxides ngenhlanganisela yamagesi we-hydrocarbon nge-H2 noma ama-compys amnandi.
Le ndlela idinga amandla amancane, kepha idinga izindlela ezengeziwe zokuphepha ngenxa yokusetshenziswa kwamagesi aqhumayo. Ngaphezu kwalokho, ngazo zombili izindlela ebusweni be-molybdenum Carbide, kwakhiwa ifilimu yekhabhoni, okuvimba ingxenye yezikhungo ezisebenza ngokuqondile futhi ngaleyo ndlela kunciphise ukusebenza kahle kokusebenzisa impahla. Ngakho-ke, ososayensi bafuna ezinye izindlela zokwenziwa kwalo.
E-PCU, kuhlongozwa ukuthi i-molybdenum carbide ihlongozwa ukuthi itholakale kusetshenziswa indlela yokuhlanganiswa kwesigaba esingu-molybdenum esiluhlaza okwesibhakabhaka (okubizwa ngokuthi ukuhlakazwa kwamakhompiyutha we-molybdenum ne-oxygen). Emsebenzini, ososayensi bakwenza ukuhlanganiswa kweMo2C ngezigaba eziningana. Ekuqaleni bathola i-molybdenum eluhlaza okwesibhakabhaka ngenxa yokwehliswa kwe-ammonium heptamolibdate solution ascorbic acid phambi kwe-hydrochloric acid.
Bese kuthi-ke i-molybdenum eluhlaza okwesibhakabhaka yamiswa futhi ibolile ngokushisa ngamazinga okushisa angama-750-800 degrees Celsius, ngenxa yokuthi i-molybdenum carbide yakhiwa. "Umehluko omkhulu womsebenzi owenziwe yi-Science Group yethu indlela ehlanganisiwe," kusho omunye wabalobi bomsebenzi, uprofesa ohambisana noMnyango weColloid Chemistry wasePctu, uNatalia Gavrilova.
Eqinisweni, asigcini nje ngokubandakanyeka ekuhlanganiseni kwezinhlayiya ezihlakazekile kakhulu, kepha sifunda isigaba ngasinye sokuthola amasistimu amakhulu, okuvumela, ukusetha umkhiqizo oyisisekelo, ukuhlanganisa umkhiqizo ngezakhiwo ezichaziwe - okungukuthi, i-molybdenum carbide nge umsebenzi ophakeme we-catalytic. "
Emsebenzini, abaphenyi bashintsha isilinganiso se-molybdenum - equkethe into equkethe kanye ne-ejenti yokunciphisa esigabeni sokuqala se-synthesis futhi bafunda ukwakheka kwalo bobabili i-molybdenum blue kanye ne-molybdenum Carbide uqobo, ehlelwa kamuva kusuka kudayi. Umsebenzi we-catalytic we-mo2c wahlolwa ngokwenza ukusabela kokuguqulwa kwe-methane ch4 (ingxenye enkulu yegesi yemvelo) kanye ne-CO2 engxubevange ye-H2, CO ne-H2O, okungukuthi, igesi ye-synthesis.
Kukhonjisiwe ukuthi sekushisa kakhulu kwamazinga okushisa angama-850 degrees Celsius, izinga lokuguqulwa kwe-methane lihlanganiswe nomsebenzi ophakeme kakhulu we-catalytic, ahlanganiswe nokuqukethwe okuphansi kwe-ejenti yokunciphisa i-ingxube yokuqala: nabo ukuguqulwa I-CH4 ne-CO2 kugesi ye-synthesis yenzeka.
Ngakho-ke, ososayensi bathola ukuthi indima enkulu ekwakhekeni kwesakhiwo kanye nokuthungwa kwe-catalyst kudlala i-ejenti eyehle kakhulu futhi, ngokushintsha okuqukethwe kwayo ezinhlelweni zomthombo ezihlakazekile, lungisa ukwakheka okuhlukahlukene kwe-molybdenum carbide futhi ulungise ukwakheka kwe-porous ye-catalyst.
Indlela ethuthukisiwe yokuguquguquka kwamazinga okushisa aphansi (uma kuqhathaniswa nezindlela zendabuko), kanye ne-mo2c esetshenzisiwe enomsebenzi ophakeme, okuvulela amandla okusebenzisa le ndlela yokuthola i-catalysts ethwala izinto ezehlukene - kufaka phakathi ukuguqulwa kwegesi yemvelo.
Umthombo: Isayensi Enqunu