Vim li cas activated alumina muaj peev xwm ntawm adsorption thiab ziab? Raws li qhov sib txawv zog ntawm activated alumina nto thiab adsorbate molecules, activated alumina adsorption yuav muab faib ua lub cev adsorption thiab tshuaj adsorption.
Rau lub cev adsorption ntawm activated alumina, lub adsorbent thiab adsorbate nyiam ib leeg los ntawm intermolecular quab yuam (tseem hu ua" van der Waals" quab yuam). Nyob rau hauv cov tshuaj adsorption ntawm activated alumina, cov adsorbed molecules cuam tshuam nrog cov atoms ntawm lub adsorbent, thiab electron hloov, atomic rearrangement los yog kev puas tsuaj thiab tsim cov tshuaj bonds yuav tshwm sim ntawm activated alumina thiab adsorbate.
Lub cev adsorption tshwm sim nyob rau hauv qhuav ntau ntawm activated alumina adsorption los ntawm compressed cua. Lub cev adsorption muaj cov yam ntxwv hauv qab no:
1. Lub zog adsorption me me, thiab cov roj adsorbed molecules yooj yim dua rov qab mus rau theem roj - uas yog, nws yooj yim dua rau"desorb" (tseem hu ua" desorption");
2. Feem ntau hais lus, cov txheej txheem ntawm lub cev adsorption ntawm activated alumina yog thim rov qab, yuav luag tsis muaj lub zog ua kom muaj zog (txawm tias nws yuav tsum tau, nws yog me me), thiab qhov adsorption thiab desorption ceev ceev heev. Nws tuaj yeem txiav txim siab tias ib zaug qhib alumina tiv tauj nrog adsorbate, adsorption yuav tshwm sim tam sim;
3. Tag nrho cov txheej txheem adsorption ntawm activated alumina yog exothermic tshua. Lub" adsorption tshav kub" tso tawm los ntawm lub cev adsorption yog tsawg dua li ntawm cov tshuaj adsorption, thiab nws cov cua sov yog ze rau lub tshav kub ntawm vaporization nyob rau hauv lub xeev ntawm adsorbate kua los yog cov cua kub ntawm condensation nyob rau hauv lub xeev ntawm gas;
4. Lub cev adsorption tsis muaj kev xaiv, uas yog, txhua yam khoom tuaj yeem nqus tau cov pa roj, uas tsuas yog nyob ntawm qhov sib txawv ntawm qhov muaj peev xwm adsorption (qhov adsorption nrog lub peev xwm adsorption tsawg dhau tsis muaj nqi siv tau);
5. Lub cev adsorption ntawm activated alumina muaj feem xyuam rau condensation, yog li nws tsuas yog nqa tawm thaum nws qis dua lub boiling point ntawm cov khoom adsorbed.