Muaj kev nce qib tseem ceeb hauv cov ntaub ntawv adsorbent tau ua tiav nrog kev ua kom zoo dua ntawm Low-Silica X (LSX) zeolite, lub tshuab molecular sieve tiam tom ntej uas npaj los hloov pauv cov txheej txheem pressure swing adsorption (PSA) rau kev tsim cov pa oxygen thiab lwm yam kev sib cais roj.
Cov zeolites ib txwm muaj, crystalline aluminosilicates nrog cov qauv pore meej, yog cov neeg ua haujlwm hauv kev sib cais thiab kev ntxuav hauv kev lag luam. Cov zeolite NaX (13X) uas siv dav dav, nrog rau qhov sib piv ntawm silicon-rau-aluminium (Si/Al) ntawm 1-1.5, yog tus qauv rau kev nqus nitrogen los ntawm huab cua. Cov zeolite LXS tshiab uas tau ua tiav thawb qhov ciam teb no mus ntxiv los ntawm kev ua tiav qhov sib piv Si/Al qis li 1.0, mus txog qhov txwv theoretical ntawm cov qauv zeolite X.
Cov khoom sib xyaw ua ke ntawm silica uas tsis tshua muaj no ua rau muaj ntau cov sodium cations uas sib npaug hauv cov qhov hws. Cov cations no tsim cov chaw sib cuam tshuam electrostatic muaj zog dua, ua rau cov khoom siv sib raug zoo rau cov molecules quadrupolar xws li nitrogen (N₂). Yog li ntawd, LXS qhia tau tias muaj peev xwm nqus nitrogen thiab xaiv tau zoo dua oxygen (O₂) piv rau nws cov 13X ib txwm muaj.
"LXS sawv cev rau kev tshawb fawb txog cov khoom siv rau kev siv tshuab nqus dej," Dr. [Fictional Name], tus thawj coj tshawb fawb ntawm Advanced Materials Institute hais. "Los ntawm kev ua kom cov txhuas muaj ntau tshaj plaws hauv FAU, peb tau tsim lub sieve nrog qhov ceev tshaj plaws ntawm cov chaw ua haujlwm. Qhov no txhais tau tias muaj kev tsim cov pa oxygen zoo dua, muab peev xwm rau kev txuag hluav taws xob ntau thiab cov khoom huv dua hauv PSA systems."
Cov kev ntsuam xyuas kev ua tau zoo ywj pheej lees paub tias cov pa oxygen uas tsim los ntawm LXS-based PSA units tuaj yeem ua tiav cov purities tshaj 95% nrog rau cov nqi rov qab zoo dua. Qhov no ua rau cov thev naus laus zis zoo heev rau kev muab cov pa oxygen kho mob nruab nrab, cov chaw kho dej khib nyiab uas xav tau kev ua kom zoo, thiab ntau yam txheej txheem hlau thiab tshuaj lom neeg.
Dhau ntawm kev tsim cov pa oxygen, qhov chaw tshwj xeeb uas muaj cation nplua nuj ntawm LXS zeolite qhib txoj hauv kev tshawb fawb zoo rau lwm yam kev sib cais, suav nrog kev ntes cov pa roj carbon dioxide los ntawm cov pa roj flue thiab kev ntxuav cov hydrogen ntws.
Cov chaw tsim khoom lag luam sau tseg tias kev tsim cov LXS, thaum xav tau kev tswj hwm meej, tuaj yeem siv tau los ntawm kev siv cov txheej txheem hydrothermal uas tau tsim tsa. Cov khoom siv khaws cia lub zog zoo heev thiab kev ruaj khov ntawm cov zeolites tsim, ua kom muaj kev ua tau zoo hauv kev ua haujlwm PSA cyclic.
Kev qhia txog LXS zeolite ua haujlwm siab yuav ua rau kev siv PSA thev naus laus zis sai dua los ua lwm txoj hauv kev txhim khu kev qha, raws li qhov xav tau rau cryogenic distillation rau kev muab pa oxygen, pab txhawb rau kev tsim cov roj lag luam muaj kev ywj pheej thiab tsis muaj kev tswj hwm.
Txog Zeolites:
Zeolites yog cov minerals me me uas feem ntau siv los ua cov adsorbents thiab catalysts. Lawv qhov loj me ntawm cov pore sib npaug ua rau lawv cais cov molecules raws li qhov loj me thiab polarity, ua rau lawv tseem ceeb heev hauv kev lag luam tshuaj lom neeg, petrochemical, thiab ib puag ncig.
Lub sijhawm tshaj tawm: Lub Ib Hlis-23-2026
