Pseudo-boehmite

Pseudo-boehmite yog qhov zoo tshaj plaws precursor thaum lub sijhawm synthesis ntawm gamma alumina, vim tias tsuas yog tshem tawm dej los ntawm calcination ntawm txog 447 C yog qhov xav tau. Kev tswj hwm ntawm cov kev hloov pauv thaum lub sijhawm synthesis ntawm pseudo-boehmite: qhov supersaturation ntawm cov tshuaj yog qhov tseem ceeb tshwj xeeb, ntxiv rau pH, kub, impurities thiab xwm ntawm cov reagents [3,4]. Xyuas kom meej tias purity ntawm cov khoom no thiab cov hloov pauv no txiav txim siab qhov morphology, kev ntxhib los mos thiab nws cov qauv ntawm precipitate. Yog li ntawd, nws yog qhov tseem ceeb los ua raws li cov xwm txheej uas tshwm sim thaum lub sijhawm synthesis, txhawm rau kwv yees cov txiaj ntsig thiab zoo ntawm cov khoom kawg. Hauv txoj haujlwm no, kev tsim cov pseudo-boehmite tau tsim los ntawm txoj kev ntawm precipitation, siv cov tshuaj aluminium sulfate supersaturated thiab concentrated ammonium hydroxide (28%) ua reactants; txoj kev paub no tau txhim kho txo ​​qis qhov kub ntawm cov tshuaj tiv thaiv hauv qab qhov kub ntawm ammonia. Kev tswj hwm kub ntawm cov tshuaj reactant tau mus txog los ntawm kev tau txais cov ntaub ntawv thiab kev tswj hwm tsis siv neeg ntawm cov cua sov nruab nrab. Nws tau qhia tias kev ua haujlwm ntawm lub reactor ntawm isothermal cov xwm txheej ua kom muaj qhov zoo kawg ntawm pseudo-boehmite tsim tawm.