Mahadum Sayensị na Nkà na Ụzụ nke Eze Abdullah nke Saudi Arabia ewepụtala ihe na-eme ka ikuku propane ghọọ hydrocarbon dị arọ nke ukwuu. (KAUST) ndị nchọpụta. Ọ na-eme ngwa ngwa mmeghachi omume kemịkalụ a maara dị ka metathesis alkane, nke enwere ike iji mepụta mmanụ ọkụ.

Ihe na-akpali akpali na-ahazi propane, nke nwere carbon carbon atọ, n'ime ụmụ irighiri ihe ndị ọzọ, dị ka butane (nwere carbon anọ), pentane (ya na carbon ise) na ethane (ya na carbon abụọ). "Ebumnobi anyị bụ ịtụgharị alkanes dị arọ nke dị ala ka ọ bụrụ alkanes dizel bara uru," Manoja Samantaray sitere na KAUST Catalysis Center kwuru.

N'ime obi nke ihe na-eme ka ọ bụrụ ogige nke ọla abụọ, titanium na tungsten, bụ ndị a na-agbanye n'elu silica site na ikuku oxygen. Atụmatụ e ji mee ihe bụ catalysis site na imewe. Nnyocha ndị gara aga gosiri na monometallic catalysts na-etinye aka na ọrụ abụọ: alkane na olefin na mgbe ahụ olefin metathesis. A họọrọ titanium n'ihi ike ya ịgbalite njikọ CH nke paraffins iji gbanwee ha ka ọ bụrụ olefins, a họọrọ tungsten maka nnukwu ọrụ ya maka metathesis olefin.

Iji mepụta ihe na-akpali akpali, ndị otu ahụ na-ekpo ọkụ silica iji wepụ mmiri dị ka o kwere mee wee gbakwunye hexamethyl tungsten na tetraneopentyl titanium, na-eme ntụ ntụ na-acha odo odo. Ndị ọrụ nyocha ahụ mụọ ihe na-akpata ihe na-akpata site na iji spectroscopy magnetic resonance (NMR) iji gosi na tungsten na atom titanium na-edina ezigbo ọnụ n'elu silica, ikekwe dị nso na ≈0.5 nanometers.

Ndị nchọpụta ahụ, nke onye nduzi nke etiti ahụ bụ Jean-Marie Basset duziri, wee nwalee ihe na-eme ka ọ dị ọkụ site na ikpo ọkụ ya na 150 ° C na propane ruo ụbọchị atọ. Mgbe ha kwalitechara ọnọdụ mmeghachi omume - dịka ọmụmaatụ, site n'ikwe ka propane na-aga n'ihu na-aga n'ihu n'elu ihe na-emepụta ihe-ha chọpụtara na ihe ndị bụ isi nke mmeghachi omume bụ ethane na butane nakwa na nke ọ bụla nke tungsten na titanium atom nwere ike ime ka nkezi nke 10,000 cycles tupu. na-efunahụ ọrụ ha. “Ọnọdụ ngbanwe” a bụ nke kachasị elu akọtụrụla maka mmeghachi omume metathesis propane.

Ihe ịga nke ọma a nke catalysis site na imewe, ndị nchọpụta na-atụ aro, bụ n'ihi mmetụta nkwado a na-atụ anya n'etiti ọla abụọ ahụ. Nke mbụ, atom titanium na-ewepu hydrogen atom site na propane ka ọ ghọọ propene na mgbe ahụ tungsten atom gbara agbata obi na-agbaji propene na carbon-carbon okpukpu abụọ, na-emepụta iberibe nke nwere ike ịbanye na hydrocarbons ndị ọzọ. Ndị nchọpụta ahụ chọpụtakwara na ntụ ntụ nke nwere naanị tungsten ma ọ bụ titanium rụrụ arụ nke ọma; ọbụlagodi mgbe a na-agwakọta ntụ ntụ abụọ a n'ụzọ anụ ahụ, arụmọrụ ha adabaghị na ihe na-emekọ ihe ọnụ.

Ndị otu ahụ nwere olile anya imepụta ihe nrụpụta ka mma nke nwere ọnụọgụ ntụgharị dị elu, yana ogologo ndụ. Samantaray kwuru, "Anyị kwenyere na n'ọdịnihu dị nso, ụlọ ọrụ nwere ike ịnakwere usoro anyị maka imepụta alkanes dizel na n'ozuzu nke catalysis site na imewe," Samantaray kwuru.