Hauv kev tiv thaiv kev lag luam niaj hnub, kev tiv thaiv hluav taws xob, catalysts yog tus yuam sij ntawm ntau cov kev siv hluav taws xob uas muaj txiaj ntsig zoo rau cov khoom siv hluav taws xob tseem ceeb thiab tshuaj lom neeg lub cev {}}
一 . Cov yam ntxwv ntawm AluminaCatalanst Cov Nqa Khoom
Qhov laj thawj yog vim li cas Alumina yog cov cab kuj zoo tshaj plaws yog vim yog cov yam ntxwv hauv qab no:
(1) thaj chaw tshwj xeeb thiab cov qauv sib tw
• Alumina cov nqa khoom feem ntau muaj qhov chaw tshwj xeeb ntawm 200-400 m² / g, uas tuaj yeem muab nplua nuj.
• Nws cov qauv porous (pore loj 2-50 nm) yog condust ntawm cov khoom lag luam thiab kev cawm ntawm cov khoom lag luam, txhim kho cov kev ua haujlwm catalytic.
(2) Zoo heev Thermal ruaj khov
• Lub ntsiab lus melting ntawm alumina yog siab npaum li 2050 degree, thiab nws tseem tuaj yeem tswj hwm cov kev nyab xeeb uas muaj kev nyab xeeb (xws li cov roj ntsha tawg) .
• Nws cov peev txheej tiv thaiv tuaj yeem txhim kho ntxiv los ntawm doping (xws li la, si, thiab lwm yam .
(3) Kho cov acidity
• Muaj Lewis acid (allected) thiab bronsted acid (-oh) tuaj yeem hloov kho ntawm Alumina, thiab cov tshuaj tsw qab) kom tau raws li cov kev xav tau ntawm cov kev ntsuas catalytic {}}
(4) Tshuaj Lom Zem Thiab Kev Siv Tshuab Muaj Zog
• Nyob hauv cov tshuaj tiv thaiv feem ntau, alumina tsis muaj kev cuam tshuam nrog reactants lossis cov khoom lag luam, kom ntseeg tau cov txheej txheem catalytic .
• Nws muaj kev muaj zog txhua yam (tshwj xeeb yog -₂o₃) yog qhov haum rau cov kev ntsuas hluav taws xob xws li txaj ruaj thiab txaj pw .
2. Cov hom kev txhawb nqa Alumina
Raws li cov qauv siv lead ua txawv, alumina cov cab kuj tuaj yeem faib ua:
|
Ntaus |
Crystal Daim Ntawv |
Nta |
Cov Kev Siv Raug Raug |
|
-Yuav₂O₃ |
Cubic Spinel |
Thaj chaw tshwj xeeb thaj tsam, muaj ntsis acidic |
Roj av me me hydrogenation, tsheb tso pa tawm catalysis |
|
θ-al₂O₃ |
Monoclinic |
Kev Hloov Xeev, Thermal Stability yog qhov zoo dua li hom |
Kev kub siab thiab txias desulfurization thiab kev hloov pauv hloov pauv |
|
-Yuav₂O₃ |
Qhov mauj rau luag |
Tsawg qhov chaw tshwj xeeb thaj chaw, ultra-highge zog zog |
Kev kub siab catalysis |
|
Mesoporous Al₂O₃ |
Amorphous |
Pore loj, tswj tau tus qauv pore |
MacRomolecular tshua |
{{0 {}} Cov ntawv thov tseem ceeb ntawm alumina cov nqa khoom
(1) petrochemicals
• catalytic cracking (FCC): -Txoj kev thauj khoom nrog Zeolite (xws li y-hom molecular sab cib) kom hloov cov roj hnyav rau hauv cov roj av thiab diesel.
• HYDROTHING (HDS / HDN): siv rau cov roj desulfurization (xws li mo-co / al₂o₃) thiab denitrification kom tau raws li cov roj huv si roj.
(2) ib puag ncig canalysis
• Kev Txhuam Ua Rau Tsheb Ua Si: Hauv peb-txoj kev hloov pauv (twc), -al₂o₃ loads PT, PD, thiab RH kom nkag mus rau CO thiab NEXE 2}}
• Vocs qhov tsis zoo: catalytic oxidation xws li benzene thiab forgordehyde hauv kev lag luam roj carimy {}}
(3) Lub zog tshiab thiab zoo tshuaj
• Cov roj hluav taws xob roj: raws li cov cab kuj ntawm PT / C catalalyst, txhim kho kev ua haujlwm ntawm cov pa oxygen txo ({0}}
• Khoom cua ammonia / methanol: core cab kuj ntawm catalysts xws li fe / aluo₃, cu / zno / al .
Txawm yogAlumina catalystCov neeg nqa khoom tsis tuaj yeem koom nrog kev tawm tsam ncaj ncees, lub neej tseem ceeb ntawm kev lag luam kev lag luam zoo li cov pa roj carbon Neutrality thiab huv si.