Lub luag haujlwm ntawm activated alumina hauv catalyst
Ua kom muaj aluminayog ib qho tseem ceeb oxide khoom siv dav hauv kev npaj cov catalysts. Nws zoo heev catalytic kev ua tau zoo ua rau nws daim ntawv thov nyob rau hauv ntau yam teb maj mam nce. Kab lus no yuav tsom mus rau kev siv cov activated alumina hauv catalysts, sib tham txog cov txheej txheem ntawm kev txiav txim ntawm cov khoom no hauv cov tshuaj tiv thaiv catalytic thiab cov yam ntxwv tseem ceeb ntawm kev ua cov catalyst zoo heev.
Ua ntej, peb yuav tsum nkag siab txog cov txheej txheem ntawm kev ua haujlwm ntawm activated alumina hauv cov tshuaj tiv thaiv catalytic. Activated alumina yog ib thaj chaw siab oxide cov khoom uas nws cov molecules deg yog cov tshuaj reactive heev thiab yog li muaj peev xwm ntawm lub cev los yog tshuaj tiv thaiv nrog lwm cov tebchaw. Lub luag haujlwm ntawm activated alumina nyob rau hauv catalytic cov tshuaj tiv thaiv tsuas yog nyob ntawm nws cov qauv saum npoo thiab cov qauv siv lead ua. Hauv cov khoom siv oxide catalysts, thaj chaw siab feem ntau txhais tau tias ntau qhov chaw tshuaj tiv thaiv, ua rau muaj kev ua haujlwm catalytic ntau dua. Tsis tas li ntawd, qhov tsis xws luag thiab distortions ntawm cov qauv siv lead ua kuj tuaj yeem ua rau ntau qhov chaw tshuaj tiv thaiv, yog li cuam tshuam rau cov khoom siv hluav taws xob physicochemical ntawm cov catalyst.
Lub superiority ntawm activated alumina nyob rau hauv catalytic cov tshuaj tiv thaiv yog reflected nyob rau hauv peb yam: siab catalytic kev ua si, zoo tshuaj stability thiab adjustable nto thaj chaw. Ua ntej, vim hais tias cov activated alumina muaj heev dispersed hais me me, qhov chaw ntawm lub catalyst yuav correspondingly nce, thiab nws yuav muaj ntau dua catalytic. Activated alumina kuj tseem tuaj yeem tswj cov tshuaj lom neeg ruaj khov ntawm qhov kub thiab txias, thiab muaj cov ntawv thov zoo rau qee qhov kev kub ntxhov siab. Thaum kawg, cov khoom nto ntawm activated alumina nyob rau hauv cov tshuaj tiv thaiv catalytic tuaj yeem kho los ntawm kev hloov kho thiab doping, yog li optimizing qhov kev xaiv thiab kev ua haujlwm ntawm cov catalyst.
Txawm li cas los xij, rau activated alumina los ua ib qho zoo heev catalyst, nws txoj kev npaj kuj tseem ceeb heev. Feem ntau, txoj kev npaj ntawm activated alumina muaj xws li sol-gel method, co-precipitation method, hydrothermal method thiab thiaj li nyob. Ntawm lawv, txoj kev sol-gel yog ib txoj kev siv ntau tshaj plaws. Hauv cov qauv no, qee cov kuab tshuaj organic yog siv los ua cov tshuaj tiv thaiv nruab nrab los tsim cov qauv gel los ntawm dispersing aluminium hydroxide hmoov thiab cov oxide precursor, thiab tom qab ntawd tau txais cov tshuaj tiv thaiv calcination kom tau txais cov khoom siv alumina. Los ntawm kev kho cov tshuaj tiv thaiv kab mob thiab tsis, cov khoom catalytic xws li roj adsorption thiab nto acidity thiab alkalinity tuaj yeem tswj tau zoo.
Nyob rau hauv xaus, activated alumina tau lug siv nyob rau hauv catalyst npaj vim nws zoo heev catalytic kev ua tau zoo thiab ntau yam kev npaj. Nws cov khoom tawg yooj yim heev thiab thaj chaw siab yog nws cov yam ntxwv tseem ceeb hauv cov tshuaj tiv thaiv catalytic thiab tus yuam sij rau ua ib qho zoo heev catalyst. Tsis tas li ntawd, cov catalytic efficiency thiab universality ntawm cov catalysts tuaj yeem ua kom zoo ntxiv los ntawm kev tswj cov kev npaj thiab cov khoom nto. Nyob rau hauv lub neej yav tom ntej, nrog rau kev tshawb nrhiav ntxiv ntawm cov khoom ntawm activated alumina thiab kev ua kom zoo dua ntxiv ntawm txoj kev npaj, nws ntseeg tias nws daim ntawv thov hauv kev tsim khoom thiab kev tsim vaj tsev yuav ua ntau dua thiab dav.