Hauv kev tsim khoom thiab lub neej, silica gel tuaj yeem siv los ua kom qhuav N2, huab cua, hydrogen, natural gas [1] thiab lwm yam. Raws li cov kua qaub thiab alkali, desiccant tuaj yeem muab faib ua: acid desiccant, alkaline desiccant thiab nruab nrab desiccant [2]. Silica gel zoo li yog lub tshuab ziab khaub ncaws tsis zoo uas zoo li qhuav NH3, HCl, SO2, thiab lwm yam. Txawm li cas los xij, los ntawm lub hauv paus ntsiab lus ntawm kev pom, silica gel yog tsim los ntawm peb-dimensional intermolecular dehydration ntawm orthosilicic acid molecules, lub cev tseem ceeb yog SiO2, thiab qhov chaw yog nplua nuj nyob rau hauv hydroxyl pawg (saib daim duab). Yog vim li cas vim li cas silica gel tuaj yeem nqus dej yog tias cov pab pawg silicon hydroxyl nyob rau saum npoo ntawm silica gel tuaj yeem tsim cov khoom sib txuas nrog cov dej molecules, yog li nws tuaj yeem nqus dej thiab ua lub luag haujlwm kom qhuav. Cov xim hloov xim silica gel muaj cobalt ions, thiab tom qab cov dej adsorption ncav cuag saturation, cobalt ions nyob rau hauv cov xim hloov silica gel ua hydrated cobalt ions, thiaj li hais tias xiav silica gel ua liab. Tom qab ua kom sov lub paj yeeb silica gel ntawm 200 ℃ rau ib lub sijhawm, hydrogen daim ntawv cog lus ntawm silica gel thiab dej molecules tawg, thiab cov silica gel discolored yuav tig xiav dua, yog li cov qauv duab ntawm silicic acid thiab silica gel tuaj yeem rov qab siv tau raws li qhia hauv daim duab 1. Yog li, txij li cov silica gel nplua nuj nyob hauv silica gel pawg. kuj tseem tuaj yeem tsim cov ntawv cog lus sib xyaw ua ke nrog NH3 thiab HCl, thiab lwm yam, thiab tej zaum yuav tsis muaj txoj hauv kev los ua tus desiccant ntawm NH3 thiab HCl, thiab tsis muaj cov ntaub ntawv qhia txog cov ntaub ntawv uas twb muaj lawm. Yog li cov txiaj ntsig tau li cas? Cov ntsiab lus no tau ua cov kev tshawb fawb hauv qab no.
Post lub sij hawm: Nov-14-2023
