Canza methane zuwa methanol a ƙarƙashin yanayin yanayi ta amfani da haske

Canza methane zuwa methanol a ƙarƙashin yanayin yanayi ta amfani da haske

Gas na halitta, wanda ya ƙunshi galibi na methane, yana da ƙarancin ƙarfin kuzari a ƙarƙashin yanayin yanayi. Sassan iskar oxygenation na methane zuwa methanol yana haɓaka yawan kuzari kuma yana motsa samar da sinadarai iri-iri. Tawagar kasa da kasa ta masu bincike, jagoranci masana kimiyya daga Jami'ar Manchester, ya ɓullo da hanya mai sauri da tsada don canza methane, ko iskar gas, zuwa methanol ruwa a zafin jiki da matsa lamba.

Os masana kimiyya da aka yi amfani da haske mai gani don gudanar da ci gaba da jujjuyawar gudana akan kayan photocatalytic. Yin amfani da watsawar neutron a cikin kayan aikin VISION, sun lura da yadda tsarin ke aiki da kuma yadda ake zaɓar shi.

Hanyar ta ƙunshi ci gaba da gudana na methane / oxygen cikakken ruwa akan sabon tsarin ƙarfe-kwayoyin halitta (MOF). Daban-daban daban-daban a cikin MOF suna taka rawa a cikin ɗaukar haske, canja wurin lantarki, da kunnawa da ɗaurin methane da oxygen. Ana fitar da methanol mai sauƙi daga ruwa. An yi la'akari da wannan tsari a matsayin "mai tsarki grail na catalysis."

Wahalar raunana ko karya haɗin sinadarai na carbon-hydrogen (CH) don shigar da ƙwayoyin oxygen (O) don samar da haɗin C-OH ya kasance babban cikas a cikin jujjuyawar methane (CH4) zuwa methanol (CH3OH). Gyaran tururi da haɗakar iskar iskar gas yawanci matakai biyu ne na tsarin jujjuyawar methane na al'ada, waɗanda ke buƙatar yanayin zafi da matsa lamba, suna da ƙarfin kuzari, tsada da rashin tasiri.

Sabuwar tsarin da aka haɓaka yana da sauri kuma mai tsada. Yana amfani da kayan MOF da yawa da haske mai gani don fitar da juyawa. Yayin da aka fallasa shi zuwa haske, an ratsa Layer na MOF granules ta rafi na CH4 da O2 cikakken ruwa. MOF ya ƙunshi abubuwa da aka ƙera da yawa waɗanda aka kayyade su a cikin babban tsari mai ƙarfi. Tare suna ɗaukar haske don ƙirƙirar electrons, waɗanda aka tura su zuwa oxygen da methane a cikin pores don ƙirƙirar methanol.

Sihai Yang, farfesa a fannin ilmin sinadarai a Manchester kuma marubucin nan, ya ce, "Don sauƙaƙe tsarin sosai lokacin da iskar methane ta fallasa zuwa kayan aikin MOF mai ɗauke da rukunin yanar gizo-iron-hydroxyl, ƙwayoyin oxygen da aka kunna da makamashin haske suna haɓaka kunna haɗin CH a cikin methane don samar da methanol. Tsarin yana da zaɓi 100% - ma'ana babu wani samfurin da ba'a so - kwatankwacin methane monooxygenase, wanda shine enzyme a cikin yanayi don wannan tsari. "

Bincike bai nuna hasarar aiki ba lokacin da ingantaccen mai kara kuzari ya keɓance, tsaftacewa, bushewa da sake amfani da shi na aƙalla zagaye goma, ko kusan sa'o'i 200 na lokacin amsawa.

Sabuwar hanyar photocatalytic tana kwatankwacin yadda tsire-tsire ke amfani da photosynthesis don canza makamashin haske zuwa makamashin sinadarai. Ta ganyen su, tsire-tsire suna sha carbon dioxide da hasken rana. Wadannan abubuwa ana canza su daga baya zuwa sukari, oxygen da tururin ruwa ta hanyar photocatalytic.

Martin Schröder, mataimakin shugaban kuma shugaban tsangayar Kimiyya da Injiniya ta Manchester kuma marubucin da ya dace, ya ce, "An kira wannan tsari da 'tsarki grail na catalysis'. Maimakon kona methane, yana iya yiwuwa a canza iskar kai tsaye zuwa methanol. Ana iya amfani da wannan sinadari mai kima don samar da albarkatun mai, abubuwan da ake amfani da su, magungunan kashe qwari da abubuwan da suka shafi mai. Wannan sabon kayan na MOF kuma yana iya sauƙaƙe sauran nau'ikan halayen sinadarai, yin aiki azaman nau'in bututun gwaji wanda zamu iya haɗa abubuwa daban-daban don ganin yadda suke amsawa."

Yongqiang Cheng, masanin kimiyar kayan aiki a ORNL's Directorate of Neutron Science, ya ce: "Yin amfani da watsawa na neutron don ɗaukar 'hotuna' a cikin kayan aikin VISION da farko sun tabbatar da haɗin gwiwa mai ƙarfi tsakanin CH4 da rukunin mono-iron-hydroxyl akan MOF wanda ke raunana CH bonds."

Anibal “Timmy” Ramirez Cuesta, wanda ke jagorantar rukunin Spectroscopy na Chemical a SNS, ya ce, “VISÃO babban na'urar sikelin neutron spectrometer ne wanda aka inganta don samar da bayanai akan tsarin kwayoyin halitta, haɗin sinadarai da hulɗar intermolecular. Kwayoyin methane suna samar da siginar watsawa mai ƙarfi na neutron mai halayyar jujjuyawarsu da rawar jiki, waɗanda kuma suke kula da yanayin gida. Wannan yana ba mu damar bayyana ma'amala mai rauni tsakanin CH4 da MOF tare da ci-gaba da fasahar duban neutron.

Sabuwar hanyar juyawa zata iya rage yawan kayan aiki da farashin aiki ta hanyar kawar da buƙatun yanayin zafi ko matsi da amfani da ƙarfin hasken rana don fitar da tsarin photooxidation. Ƙarfafa saurin tsarin da ikonsa na canza methane zuwa methanol ba tare da samfurori da ba a so ba zai sauƙaƙe haɓaka aikin sarrafa layi wanda ke rage farashi.

Maganar Diary:

    1. An, B., Li, Z., Wang, Z. et al. Photo-oxidation kai tsaye na methane a cikin methanol akan rukunin hydroxyl mono-iron. nat. uwa (2022). DOI: 10.1038/s41563-022-01279-1

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