Alumina carrier hais txog cov hmoov dawb dawb lossis zoo li muaj alumina khoom. Nws yog cov feem ntau siv cov catalyst cab kuj, kwv yees li 70% ntawm kev txhawb nqa kev lag luam catalysts. Alumina muaj ntau hom, tsis tsuas yog cov ntawv sib txawv muaj cov yam ntxwv sib txawv, txawm tias tib daim ntawv muaj cov yam ntxwv sib txawv, xws li ntom, cov qauv pore, thaj chaw tshwj xeeb, thiab lwm yam, vim muaj ntau qhov chaw.
Cov khoom no muaj qhov tseem ceeb tseem ceeb rau alumina siv los ua kev txhawb nqa. Alumina feem ntau npaj los ntawm nws cov hydroxide (tseem hu ua hydrated alumina lossis alumina hydrate).
Kev lag luam alumina kev txhawb nqa muaj nyob rau hauv cov hmoov ntawv, tab sis feem ntau lawv zoo li tus. Sawb, spherical, thiab ingot alumina feem ntau yog siv los ua kev txhawb nqa ntawm cov catalyst hauv cov tsau txaj reactor, thiab microspherical alumina kev txhawb nqa feem ntau yog siv nyob rau hauv cov txaj txaj reactor. Nws tseem tuaj yeem ua rau hauv cov tsheb thauj mus los tshwj xeeb yuav tsum muaj cov txheej txheem tshwj xeeb, xws li lub nplhaib, trilobal, honeycomb, fibrous (saib alumina fiber) thiab lwm yam. Ntxiv rau cov khib nyiab, kuj muaj cov roj ntsha alumina rau kev muag. Cov tsis tseem ceeb thaum xaiv alumina yog cov qauv siv lead ua, kev coj dawb huv, thaj chaw tshwj xeeb thaj chaw, pore qauv thiab qhov ntim ntau. Qhov tshwj xeeb thaj tsam thaj chaw ntawm α-alumina yog tsawg heev (tsawg dua 1m2 / g), thiab tshwj xeeb thaj tsam thaj chaw ntawm kev hloov pauv alumina feem ntau ncav cuag 10 ～ 102m2 / g.
Cov kev lag luam molded kev ua lag luam alumina txhawb feem ntau yog cov khoom siv ntxeem tau, thiab cov pore loj thiab faib tau muaj lub zog tseem ceeb rau cov khoom tawg yooj yim ntawm cov reactants hauv cov catalyst hais thaum lub sijhawm txheej txheem catalysis. Qhov pore txoj kab uas hla ntawm cov pores zoo tuaj yeem tsawg dua 20┱, thiab qhov pore txoj kab uas hla ntawm cov ntxhib pores tuaj yeem mus txog qib micron, thiab pore tus qauv nws txawv nrog ntau yam. Txhua qhov kev hloov pauv-xeev aluminas muaj dej kom ntau dua lossis tsawg dua, thiab muaj qee qhov hydroxyl pawg thiab nthuav tawm aluminium atoms rau saum npoo, yog li nthuav tawm cov yam ntxwv ntawm B acid thiab L acid (saib acid-base catalysts). Tus cwj pwm muaj tus cwj pwm tseem ceeb. Degity acidity muaj feem xyuam nrog kev npaj ua tiav, tshwj xeeb tshaj yog impurity ions thiab kub kho kub. Kev tsis pom zoo xws li halogen yuav txhim kho lub acidity ntawm alumina, thiab qhov ua kom zoo ntawm acidity yuav txhawb cov catalytic kev ua haujlwm ntawm alumina nws tus kheej rau hydrocarbon ua kom tawg thiab isomerization kev tsis haum.
Daim ntawv thov:
① Support catalytic yam khoom siv. Alumina nrog thaj chaw tshwj xeeb me me (lossis cov khoom siv nrog tus nqi me me ntawm coarse qhov hws) feem ntau yog siv los txhawb catalyst cov khoom ua ke nrog cov kev ua haujlwm siab. Kev siv ntawm hom thauj no tuaj yeem tshem tawm cov nyhuv diffusion hauv lub qhov hws, thiab tuaj yeem txo qhov tob ntawm oxidation sab cov tshuaj tiv thaiv hauv cov txheej txheem rau xaiv cov oxidation. Piv txwv, cov nyiaj catalyst siv rau hauv cov hlau oxidation ntawm ethylene rau ethylene oxide siv α-alumina ua tus cab kuj. Alumina nrog thaj chaw loj tshwj xeeb muaj kev tsim cov pore tsim, uas ua kom cov chaw txhawb zog catalyst cov khoom ua kom tau tawg ua rau cov khoom tawg yooj yim, thiab nrog kev pab cuam ntawm cov nyom ntawm cov cab kuj, tiv thaiv cov kev ua haujlwm ntawm cov khoom sib txuas los ntawm kev ua txhaum thiab loj hlob thaum siv Cov. Alumina kev them nyiaj yug siv. Piv txwv li, dispersing precious hlau palladium, platinum, rhodium, thiab lwm yam ntawm cov paib alumina los ua hydrogenation catalyst tuaj yeem txhim kho kev siv tus nqi ntawm cov hlau zoo.
AcidThe acidity ntawm alumina nto thiab txhawb cov khoom txhawb nqa ua lub hauv paus ua haujlwm muaj kev ua tau zoo. Piv txwv, platinum-alumina catalyst siv nyob rau hauv kev hloov kho platinum, nyob rau hauv uas alumina ua haujlwm ua cov cab kuj thiab ib qho kev ua haujlwm ntawm lub catalyst.
Xaiv cov txiaj ntsig zoo ntawm kev ua kom muaj alumina, thov nrhiavZibo Xiangrun Chaw Tsim Kho Khoom Vaj Tse Co., Ltd thiab Shandong Bairui Chemical Co., Ltd.