Buyini ubuchwepheshe be-"catalytic graphitization"?

I-Catalytic graphitization ubuchwepheshe obusebenzisa ama-catalyst athile (njenge-iron, i-ferrosilicon, i-boron, njll.) ukuze kube lula ukuguqulwa kwe-carbon engabonakali ibe yisakhiwo se-graphite emazingeni okushisa aphansi ngesikhathi sokulungiselela izinto ze-carbon.

Isimiso Sobuchwepheshe

Ingqikithi ye-catalytic graphitization itholakala ekusebenziseni ama-catalyst ukunciphisa amandla okusebenza kwe-graphitization reaction, ngaleyo ndlela kusheshiswe ukuguquka kwama-athomu e-carbon kusuka ekuhlelweni okungahlelekile kuya esakhiweni se-graphite esihlelekile. Izindlela zifaka phakathi ikakhulukazi imibono emibili:

Indlela Yokuncibilikisa Nokuna Kwemvula:

Ikhabhoni e-Amorphous iyancibilika ibe yingxube encibilikisiwe eyakhiwe yi-catalyst. Lapho ukuncibilika kufinyelela esimweni sokugcwala ngokweqile, ama-athomu ekhabhoni aphuma ngesimo samakristalu e-graphite.
Isibonelo, i-ferrosilicon catalyst ingancibilikisa kufika ku-2% wekhabhoni ku-1600°C, okwenza ikhabhoni ivele njenge-graphite. Ngesikhathi esifanayo, ukwakheka kwezakhiwo ze-silicon carbide ezinezinhlangothi eziyisithupha kusiza ekwakhekeni kwe-graphite.

Indlela Yokwakheka Nokubola Kwe-Carbide:

I-catalyst isabela nekhabhoni ukuze yakhe ama-carbide, aqhekeka abe yi-graphite kanye nomhwamuko wensimbi emazingeni okushisa aphezulu.
Isibonelo, i-iron oxide isabela ne-carbon ukuze ikhiqize i-iron ne-carbon monoxide. I-iron ibe isihlangana ne-carbon ukuze yakhe i-iron carbide, ekugcineni ebola ibe yi-carbon ne-iron ezitholakala kalula.

Izinhlobo ze-Catalyst kanye nemiphumela

I-Ferrosilicon Catalyst:

• Okuqukethwe kwe-silicon okuhle kakhulu kungu-25%, okunganciphisa izinga lokushisa le-graphitization kusuka ku-2500-3000°C kuya ku-1500°C.
• Usayizi wezinhlayiya ze-ferrosilicon uthinta umphumela we-catalytic: lapho usayizi wezinhlayiya wehla kusuka ku-75 μm kuya ku-50 μm, ukumelana kukagesi kuyancipha. Kodwa-ke, izinhlayiya ezincane kakhulu (<50 μm) zingaholela ekwandeni kokumelana.

I-Boron Catalyst:

• Kunganciphisa izinga lokushisa le-graphitization libe ngaphansi kuka-2200°C futhi kuthuthukise izinga lokuqondiswa kwemicu yekhabhoni.
• Isibonelo, ukwengeza i-0.25% ye-boric acid kufilimu ye-graphene e-oxidized kanye nokuyiphatha ngokushisa ku-2000°C kwandisa ukuhanjiswa kukagesi ngo-47% kanye nezinga le-graphitization ngo-80%.

Isikhangisi Sensimbi:

• Insimbi inephuzu lokuncibilika elingu-1535°C. Uma i-silicon ingezwa, iphuzu lokuncibilika lehla cishe libe ngu-1250°C, futhi isenzo sokuvuselela siqala kuleli qondo lokushisa.
• Insimbi iphuma ngesimo segesi ku-2000°C, kuyilapho i-silicon iphuma njengomhwamuko ngaphezu kuka-2240°C, ingashiyi nsalela kumkhiqizo wokugcina.

Izinzuzo Zobuchwepheshe

Ukonga Amandla:

Ukwenziwa kwe-graphitization yendabuko kudinga amazinga okushisa aphezulu angu-2000-3000°C, kanti ukwenziwa kwe-catalytic graphitization kunganciphisa izinga lokushisa libe cishe ngu-1500°C, okusindisa kakhulu amandla.

Umjikelezo Wokukhiqiza Ofinyeziwe:

Isenzo se-catalytic sisheshisa ukuhlelwa kabusha kwama-athomu e-carbon, sinciphise isikhathi se-graphitization.

Ukusebenza Okuthuthukisiwe Kwezinto Ezibalulekile:

I-Catalytic graphitization ingalungisa amaphutha esakhiwo futhi inyuse izinga le-graphitization, ngaleyo ndlela ithuthukise ukuhanjiswa kukagesi, ukuhanjiswa kokushisa, kanye namandla omshini.

• Isibonelo, i-graphitization ebangelwa yi-boron ikhiqiza amafilimu e-graphene anokuqhutshwa kukagesi okungu-3400 S/cm, afanele ukusetshenziswa kuma-electronics aguquguqukayo kanye nokuvikela ukuphazamiseka kwe-electromagnetic.

Izindawo Zokufaka Isicelo

Izinto ze-Electrode:

Ama-electrode e-graphite alungiselelwe nge-catalytic graphitization abonisa ukuhanjiswa kukagesi okuphezulu kanye nokumelana nokushisa, okwenza afaneleke ezimbonini ezifana ne-metallurgy kanye ne-electrochemistry.

Izinto Zokugcina Amandla:

Izinto zekhabhoni ezifakwe i-graphitized zisetshenziswa njenge-anode kumabhethri e-lithium/sodium, okuthuthukisa umthamo othize wokukhipha ishaja kanye nokuqina komjikelezo.

Izinto Ezihlanganisiwe:

Ubuchwepheshe be-catalytic graphitization bungakhiqiza izinto ezihlanganisiwe ze-carbon/carbon ezisebenza kahle kakhulu ezisetshenziswa ezindiza, ekukhiqizweni kwezimoto, nakweminye imikhakha.

Izinselele Zobuchwepheshe

Ukukhethwa Nokuthuthukiswa Kwe-Catalyst:

Ama-catalyst ahlukene abonisa imiphumela ehlukahlukene kakhulu yokuvuselela, okwenza kudingeke ukukhethwa kwama-catalyst afanele ngokusekelwe ohlotsheni lwezinto kanye nezimo zenqubo.

Izinkinga Zezinsalela Ze-Catalyst:

Amanye ama-catalyst (njenge-vanadium) anamaphuzu aphezulu okuncibilika futhi kunzima ukuwasusa ngokuphelele ngemva kokuguqulwa kwe-graphitization, okungase kuthinte ubumsulwa bezinto ezibonakalayo.

Ukulawulwa Kwenqubo:

I-Catalytic graphitization iyazwela kumapharamitha afana nokushisa, umkhathi, nesikhathi, okudinga ukulawulwa okunembile ukuze kugwenywe i-over-graphitization noma i-graphitization enganele.