Cov txheej txheem rau kev ua cov pa roj carbon monoxide feem ntau muaj cov pa roj carbonization ua raws li kev ua kom cov khoom siv carbonaceous los ntawm cov zaub hauv paus. Carbonization yog kev kho cua sov ntawm 400-800 ° C uas hloov cov ntaub ntawv raw rau carbon los ntawm kev txo cov ntsiab lus ntawm cov teeb meem tsis haum thiab ua kom cov ntsiab lus carbon ntawm cov khoom. Qhov no ua rau kom cov ntaub ntawv muaj zog thiab tsim kom muaj cov qauv ntxeem tau thawj zaug uas tsim nyog yog tias cov pa roj carbon yuav tsum tau qhib. Kho cov xwm txheej ntawm carbonization tuaj yeem cuam tshuam cov khoom kawg. Qhov kub ntawm carbonization nce ntxiv reactivity, tab sis nyob rau tib lub sij hawm txo qhov ntim ntawm pores tam sim no. Qhov kev txo qis ntawm qhov pores no yog vim qhov nce ntawm cov condensation ntawm cov khoom ntawm qhov kub thiab txias ntawm carbonization uas yields ib tug nce nyob rau hauv mechanical zog. Yog li ntawd, nws yog ib qho tseem ceeb los xaiv cov txheej txheem kom raug raws li cov khoom xav tau ntawm carbonization.
Cov oxides diffuse tawm ntawm cov pa roj carbon monoxide ua rau ib feem ntawm gasification uas qhib lub qhov hws uas tau kaw dhau los thiab txuas ntxiv txhim kho cov pa roj carbon monoxide sab hauv. Hauv kev ua kom tshuaj lom neeg, cov pa roj carbon reacted ntawm qhov kub thiab txias nrog lub cev qhuav dej uas tshem tawm feem ntau ntawm hydrogen thiab oxygen los ntawm cov qauv carbon. Kev siv tshuaj lom neeg feem ntau ua ke nrog cov pa roj carbonization thiab ua kom cov kauj ruam, tab sis ob kauj ruam no tseem tuaj yeem tshwm sim sib txawv nyob ntawm tus txheej txheem. Cov cheeb tsam siab tshaj li ntawm 3,000 m2 / g tau pom thaum siv KOH ua cov tshuaj tua kab mob.
Activated Carbon los ntawm txawv Raw Materials.
Ntxiv nrog rau kev ua ib qho adsorbent siv rau ntau lub hom phiaj sib txawv, cov pa roj carbon activated tuaj yeem tsim los ntawm cov khoom siv raw khoom sib txawv, ua rau nws muaj ntau yam khoom lag luam uas tuaj yeem tsim nyob rau hauv ntau qhov sib txawv nyob ntawm seb cov khoom siv raw li cas. Qee cov ntaub ntawv no suav nrog cov plhaub ntawm cov nroj tsuag, pob zeb ntawm cov txiv hmab txiv ntoo, cov ntaub ntawv ntoo, asphalt, hlau carbides, carbon dub, cov khib nyiab pov tseg los ntawm cov dej phwj tuaj, thiab cov khoom siv polymer. Ntau hom thee, uas twb muaj nyob rau hauv daim ntawv 5 carbonaceous nrog cov qauv pore tsim, tuaj yeem ua tiav ntxiv los tsim cov pa roj carbon activated. Txawm hais tias cov pa roj carbon activated tuaj yeem tsim los ntawm yuav luag txhua yam khoom siv raw, nws yog tus nqi zoo tshaj plaws thiab kev paub txog ib puag ncig los tsim cov pa roj carbon activated los ntawm cov khoom pov tseg. Cov pa roj carbon activated uas ua los ntawm cov txiv maj phaub plhaub tau pom tias muaj cov micropores siab, ua rau lawv cov khoom siv raw khoom siv ntau tshaj plaws rau cov ntawv thov uas muaj peev xwm adsorption siab. Sawdust thiab lwm cov khoom seem ntoo kuj muaj cov qauv tsim microporous uas zoo rau adsorption los ntawm cov roj theem. Ua cov pa roj carbon activated los ntawm txiv ntseej, plum, apricot, thiab txiv duaj pob zeb yields homogenous adsorbents nrog qhov tseem ceeb hardness, tsis kam mus rau abrasion thiab siab micropore ntim. PVC seem tuaj yeem qhib tau yog tias HCl raug tshem tawm ua ntej, thiab ua rau muaj cov pa roj carbon activated uas yog ib qho zoo adsorbent rau methylene xiav. Cov pa roj carbon activated tseem tau tsim los ntawm cov log tsheb. Txhawm rau kom paub qhov txawv ntawm ntau qhov ua tau ua ntej, nws yuav tsum tau soj ntsuam cov txiaj ntsig ntawm lub cev tom qab ua kom tiav. Thaum xaiv cov khoom ua ntej, cov khoom nram qab no yog qhov tseem ceeb: thaj tsam ntawm qhov pores, pore ntim thiab pore ntim faib, muaj pes tsawg leeg thiab qhov loj ntawm granules, thiab cov qauv tshuaj / tus cwj pwm ntawm cov pa roj carbon monoxide.
Xaiv qhov tseeb precursor rau txoj cai daim ntawv thov yog ib qho tseem ceeb heev vim hais tias variation ntawm precursor cov ntaub ntawv tso cai rau kev tswj cov carbons pore qauv. Cov precursors sib txawv muaj ntau qhov sib txawv ntawm macropores (> 50 nm,) uas 6 txiav txim siab lawv cov reactivity. Cov macropores no tsis zoo rau adsorption, tab sis lawv lub xub ntiag tso cai rau ntau txoj hauv kev tsim cov micropores thaum ua kom muaj zog. Tsis tas li ntawd, cov macropores muab ntau txoj hauv kev rau adsorbate molecules kom ncav cuag micropores thaum lub sij hawm adsorption.
Post lub sij hawm: Apr-01-2022