Dab tsi yog qhov cheeb tsam meej?
Nag lossis daus silica nrog thaj chaw ntawm thaj chaw ntawm 185 m / g (xws li JS-185) yog hais txog qhov sib ntxiv ntawm 1 gram ntawm cov npliag silica cov nplaim dej mus rau qhov chaw tom qab uas ua kom tiaj, tag nrho 185 square meters.
BET Qhia Txog Kev Ntsuas Ntu Thaj Chaw: Raws li qee qhov kev ntsuas qee yam, raws li tag nrho cov nyiaj ntawm cov tshuaj molecule xws li nitrogen adsorbed los ntawm qee qhov nqi ntawm cov nag lossis daus silica, hom nag lossis daus tuaj yeem suav.
Qhov tshwj xeeb thaj tsam thaj chaw ntawm precipitated silica . Nws txoj cai ntsuas yog raws li FBET kev sib npaug, yog li nws hu ua BET ib qho chaw tshwj xeeb. BET kev sib npaug yog ib qho sib npaug piav qhia txog txoj kev xav ntawm ntau cov qauv txheej txheej adsorption npaj los ntawm Brunauer, Emmet thiab Teller xyoo 1938 los ntawm Langmuir kev sib npaug, uas tseem muaj npe los ntawm kev sib txuam ntawm thawj cov tsiaj ntawv ntawm peb. Cov feem ntau siv adsorbents rau kev txiav txim siab tshwj xeeb thaj chaw thaj chaw ntawm hmoov yog nitrogen, argon thiab ammonia raws li BET kev sib npaug.
BET qhov chaw tshwj xeeb yog qhov tseem ceeb sim theem:
BET qhov tseeb cheeb tsam thaj chaw tau ntsuas los ntawm kev ntsuas cov dej nag ntau ntawm 160 C thiab sau cov nag lossis daus thaum kawg ntawm kev nqus degassing. Kev ntsuas qhov ntsuas tus qauv tsim nyog tau raug xaiv rau kev txiav txim siab BET cov cheeb tsam tshwj xeeb.
Lub ntsiab lus ntawm BET qhov chaw tshwj xeeb:
BET qhov chaw tshwj xeeb hauv cheeb tsam yog qhov tseem ceeb tseem ceeb qhia rau cov nplaim dej silica. Nws cov yam ntxwv ntawm lub cev tshwj xeeb ntawm thaj chaw thaj chaw ntawm precipitated silica. Qhov ntsuas tau zoo cuam tshuam rau qhov cuab lub zog, adsorption thiab rhuav tshem ntawm precipitated silica. Nws tseem yog lub hauv paus tseem ceeb rau kev faib cov hom tshwj xeeb ntawm precipitated silica, xws li JINSIL 700, JINGSIL 900 thiab JINSIL H600, uas yog siv rau kev txhawb cov roj hmab, raws li qhov tshwj xeeb thaj tsam thaj chaw ntawm precipitated silica BET.