Qhov txawv ntawm Pseudo-boehmite thiab Boehmite
May 19, 2022
Aluminium hydroxide, tseem hu ua hydrated alumina, nws cov tshuaj formula rau Al2O3·NH2O. Thaum n=1, Al2O3·H2O hu ua alumina monohydrate, uas tuaj yeem muab faib ua peb hom: diaspore, boehmite thiab pseudo-boehmite. Qhov sib txawv tseem ceeb ntawm boehmite thiab pseudo-boehmite yog nyob rau hauv grain loj.
Alumina muaj ntau hom siv lead ua, nyob rau hauv cov xwm txheej sib txawv calcined alumina hydroxide kev npaj ntawm alumina siv lead ua morphology txawv, ntawm cov uas -al2o3 yog qhov siv dav tshaj plaws hauv kev lag luam hloov pauv alumina, tseem hu ua activated alumina. -al2o3 muaj thaj chaw loj tshwj xeeb, tuaj yeem siv ntau cov hlau lossis hlau oxide cab kuj, nws qhov aperture loj yog adjustable, zoo thermal stability, feem ntau siv hydrogenation, hloov kho, methanol synthesis thiab lwm yam kev cuam tshuam catalyst cab kuj. Tam sim no, kev lag luam qhib alumina feem ntau tau txais los ntawm calcination ntawm pseudo-boehmite, uas yog siv dav hauv roj refining thiab kev lag luam tsheb. Txhawm rau npaj cov alumina nrog thaj tsam loj thiab qhov pore loj, nws yog ib qho tsim nyog los npaj lub precursor ntawm boehmite los yog pseudo-boehmite nrog loj tshwj xeeb deg cheeb tsam. Lub morphology thiab particle loj ntawm pseudo-boehmite txiav txim siab morphology thiab thaj chaw tshwj xeeb ntawm alumina. Tam sim no, txoj kev npaj ntawm pseudo-boealumite feem ntau suav nrog cov kua qaub los nag txoj kev, alkali nag lossis daus txoj kev, aluminium cawv txoj kev thiab sodium aluminate - carbon dioxide txoj kev.
