Hauv compressed cua tshuab ziab khaub ncaws,alumina qhib kom ua huajyog qhov feem ntau siv adsorbent vim tias nws muaj ntau yam zoo daim ntawv thov. Kev siv alumina feem ntau yog ua kom cov khoom cua sib xyaw ua ke, feem ntau los ntawm kev ua cua sov thiab ua kom lub cev qhuav dej ntawm cov txhuas ob zaug. Qhov xwm ntawm cov khoom siv hauv lub zog ua kom ze rau tus qauv thiab morphology ntawm thawj cov khoom siv hydroxide. Tusalumina qhib kom ua huajnyob rau hauv daim ntawv ntawm Y yog siv rau lub tshuab cua tshaj tawm thiab kom qhuav, thiab nws ua kom kub dua yog qis dua 600 ° C.
Qhib alumina muaj qhov sib luag rau dej. Raws li qee qhov kev ua haujlwm, nws cov ua kom qhuav tuaj yeem ncav lub lwg taw tes hauv qab -60 ℃. Nws qhov kev ua haujlwm kub dua yog qis dua li ntawm cov khoom siv molecular sieves. Activated alumina muaj qhov saum npoo tawv tawv thiab lub zog compressive. , Qhov taw tes crushing lub zog tuaj yeem ncav cuag ~ 100N / particle (khoom lag luam), qhov hnav tus nqi yog tsawg dua 0.04, nws tsis yooj yim kom tawg raws li kev ua ntawm qhov ntsuas siab, thiab nws tsis yooj yim rau hnav raws li qhov kev txiav txim ntawm kuj tsis paub meej siab Cov. Vim tias muaj peev xwm loj adsorption (zoo li qub adsorption muaj peev xwm: 15-20%), adsorption-kho lub voj voog tuaj yeem siv sijhawm ntev dua li lwm qhov adsorbents hauv cov txheej txheem kom qhuav ntawm lub siab kub roj, yog li zam qhov hloov pauv ntawm kev ua haujlwm.
Silica gel yog cov khoom siv niaj hnub ua kom lub cev qhuav dej, tuaj yeem muab faib ua ntuj thiab hluavtaws. Lub ntuj porous SiO₂ feem ntau hu ua diatomaceous lub ntiaj teb, thiab cov khoom cua ib leeg hu ua silica gel.
Silica gel (mSiO2 · nH2O) yog colloid tsim los ntawm polycondensation ntawm silicic acid. Nws tuaj yeem ua cov khoom lag luam nrog ntau pore ntau thiab tsawg. Hom A muaj pore loj ntawm 2-3nm, thiab Hom B muaj pore loj ntawm 0.7nm thiab thaj chaw tshwj xeeb ntawm 100-1000m³ / g ncig. Silica gel muaj cov adsorption zoo rau cov dej, yog li nws yog dav siv rau lub cev qhuav dej thiab kom qhuav ntawm cov tshuaj. Hom A silica gel tuaj yeem siv rau ntau lub sijhawm qhuav, thaum Hom B silica gel tsuas yog siv rau qee qhov chaw noo noo ntau dua 50%.
Lub silica gel siv rau sib cais roj yog cov artificially synthesized. Lawv muaj cov tshuaj ua tau zoo ntawm tshuaj lom neeg, kev tiv tshav kub thiab cov ua hauj puas. Kev ua tiav ntawm silica gel yog hydrophilic, nws pore loj faib yog ib qho thiab nqaim, thiab lub peev xwm adsorption rau dej yog loj. Hauv cov huab cua ntws nrog cov av noo ntawm 20 ° C thiab qhov txheeb ze ntawm 60%, cov dej noo ntawm microporous silica gel yog 24% ntawm nws tus kheej. Adsorption thiab ziab ntawm huab cua nrog cov ntsiab lus noo siab.
