Dab tsi yog Kev Siv Alumina hauv Catalysis
Kev ua haujlwm ntawm alumina hauv thaj chaw ntawm catalysis yog ntau haiv neeg, thiab nws daim ntawv thov ua tus nqa khoom hauv kev lag luam catalysis yog qhov dav tshaj plaws. Tsis tas li ntawd, qee cov alumina kuj tseem siv tau los ua cov khoom siv hluav taws xob. Raws li rau qee qhov alumina hydrates siv los ua binders hauv kev tsim cov catalysts lossis cov nqa khoom, lawv tau nthuav dav ntxiv hauv daim ntawv thov ua alumina catalyst cov ntaub ntawv tom qab siab -kub calcination.
1. Alumina ua catalyst cab kuj
Alumina yog dav siv los ua catalyst carrier hauv teb xws li refining, chiv, thiab petrochemicals.
(1) Refining catalyst cab kuj
Refining catalysts feem ntau suav nrog cov catalytic cracking catalysts, catalytic hloov kho catalysts, hydrofining agents, hydrocracking catalysts, hloov kho pretreatment catalysts, alkylation catalysts, olefin stacking catalysts, ethylene oxide silver catalysts, thiab lwm yam. feem ntau yog spherical, elongated, thiab cloverleaf -puab; hydrogenation catalyst carriers feem ntau siv -alumina, ua rau hauv nplooj ntawv, spheres, elongated duab, thiab cloverleaf duab, nrog ib tug me me ntawm SiO ntxiv los txhim kho thermal stability. Hauv xyoo tas los no, kev lag luam hauv tsev thiab txawv teb chaws tau qhia -alumina uas muaj TiO ua cov khoom thauj rau hydrofining catalysts; ethylene oxide nyiaj catalysts siv -Al2O3 ua cov khoom thauj; alumina kuj yog ib feem siv hauv catalytic cracking.
(2) Fertilizer catalyst nqa
Fertilizer catalysts account rau qhov loj tshaj plaws ntawm cov tshuaj catalysts. Sulfur-tolerant wide-kub hloov pauv catalysts noj cov khoom siv alumina feem ntau, tag nrho siv -Al2O3 ua cov cab kuj, feem ntau nyob rau hauv spherical thiab elongated cov ntaub ntawv uas muaj peev xwm ua lag luam zoo. Methanation catalysts siv daim ntawv los yog kheej kheej y-A103 ua cov nqa khoom. Hauv hydrocarbon steam conversion catalysts, gaseous hydrocarbon conversion feem ntau siv -Al2O3 ua cov cab kuj. Tsawg- hloov pauv kub, methanol synthesis, thiab cawv-synthesis catalysts feem ntau siv CuO·ZnO·Al0 ua cov khoom tseem ceeb.
(3) Petrochemical catalyst nqa
Toluene dealkylation rau benzene siv elongated -Al2O3 loaded nrog Cr2O3. Ethanol dehydration rau ethylene, glycol dehydration rau glycol, feem ntau siv kheej kheej los yog elongated -Al2O3, nrog me me ntawm additives li catalysts. Muaj ntau ntau hom hydrogenation catalysts, xws li benzene phenol hydrogenation rau cyclohexanol, benzene hydrogenation rau cyclohexane siv -Al2O3 nickel carriers, thiab -AL2O siv rau desulfurization ntawm kev hloov pauv catalysts. C2 roj theem hydrogenation siv θ–Al2O3 ua tus nqa khoom, thiab C3 kua theem hydrogenation siv δ-Al2O3 ua tus nqa khoom. Al2O3 yog cov khoom tseem ceeb ntawm COS hydrolysis hauv cov roj hluavtaws purification. Cov tshuaj dechlorination kuj tseem siv -Al2O3 ua cov khoom tseem ceeb.
2.Alumina li catalyst
Catalysts uas muaj alumina feem ntau yog siv los ua cov khoom siv nrog ntau yam khoom siv. Kuj tseem muaj chav kawm ntawm cov catalysts uas ncaj qha siv alumina ua cov catalyst, los yog npaj cov oxide catalysts los ntawm kev sib txuas alumina nrog lwm cov oxides. Claus sulfur recovery catalysts, ethanol dehydration catalysts, methanol dehydration to dimethyl ether, ethanol amination thiab esterification catalysts yog cov piv txwv ntawm -Al2O3 siv ncaj qha los ua catalysts. A10 thiab AL0 tuaj yeem siv los ua catalysts rau olefin ob daim ntawv cog lus hloov. Al2O3 kuj tseem tuaj yeem ua ke nrog lwm cov oxides los npaj cov khoom sib xyaw oxide catalysts rau kev siv sib xyaw.
3 Alumina li binder
Thaum tsim cov catalysts los yog catalyst carriers, nws yog ib qho tsim nyog yuav tau ntxiv cov binders raws li kev pab cuam. Qee cov hydroxides, tshwj xeeb tshaj yog pseudo-boehmite, tuaj yeem ua cov binders zoo heev los khi lawv tus kheej cov khoom uas nyuaj rau kev tsim tab sis haum raws li catalysts, los yog khi rau lwm yam catalyst particles uas tsis haum rau nag lossis daus ntawm cov cab kuj. Thaum alumina siv los ua cov ntaub ntawv, nws tsis yog tsuas yog txhim kho lub zog ntawm cov khoom siv catalytic, tab sis kuj muaj qhov porosity thiab cov cua sov zoo tuaj yeem kho cov qauv pore thiab kub tsis kam ntawm cov catalyst, thiab hloov mus rau qhov kub thiab txias dua. Tsis tas li ntawd, alumina kuj muaj cov dej tsis zoo, yog li cov catalyst yuav tsis tawg lossis tawg txawm tias nws ntub los yog ntub dej.