Kaʻina hoʻāʻo Boehmite kikoʻī

Hoʻohana nui ʻia ʻo Boehmite, he mineral koʻikoʻi ma muli o ka aluminika -ma nā kākoʻo catalyst, nā uhi hoʻokaʻawale pākaukau lithium, a me nā ceramics. No ka hōʻoiaʻiʻo ʻana i kona maʻemaʻe, ka hoʻolālā aniani, a me nā waiwai kino e kū i nā kūlana ʻoihana, pono kahi kaʻina hoʻāʻo ʻōnaehana no ka hoʻokele maikaʻi. Eia nā ʻanuʻu nui a me nā wahi ʻenehana no ka hoʻāʻo boehmite.

I. Laʻana Pretreatment

Pono e hoʻomaʻamaʻa mua ʻia nā laʻana Boehmite ma mua o ka hoʻāʻo ʻana e hōʻoia i nā hopena analytical pololei. ʻO ka mua, e wili i ka laʻana maka i ka fineness o 200 mesh a ʻoi aku ka maikaʻi me ka hoʻohana ʻana i ka mea wili a hoʻomaloʻo i loko o ka umu ma 105 degere -110 degere no 2 mau hola e wehe i ka wai adsorbed. Inā pili ka ho'āʻo ʻana i nā pūʻulu hana ili a i ʻole nā ​​mea haumia organik, pono ka hoʻomaʻemaʻe hou ʻana me ka anhydrous ethanol a me ka maloʻo maloʻo e pale i ke koena o ka solvent mai ke keʻakeʻa ʻana i ka nānā ʻana ma hope.

II. Ho'āʻo Waiwai Kino
1.Particle Size Distribution: Hoʻohana ʻia kahi mea hoʻoponopono nui laser (e like me ka Malvern Mastersizer) e ana i ka nui o ka nui o nā mea boehmite. ʻO ka D50 (median diameter) ka mea maʻamau i kaohi ma waena o 0.5 a me 5 μm e hoʻokō i nā koi o nā hiʻohiʻona noiʻi like ʻole.

2. ʻAha Kūʻokoʻa: Ana ʻia ka ʻāpana kikoʻī me ka hoʻohana ʻana i ke ʻano adsorption BET nitrogen (e like me ka Micromeritics ASAP 2020). ʻO ka boehmite maʻemaʻe kiʻekiʻe he 5 a 20 m²/g, e pili pono ana i ka hana catalytic a me ka hoʻohui like ʻana o ka uhi.

3.Crystal Morphology: Hoʻohana ʻia ka scanning electron microscopy (SEM) e nānā i ka morphology particle. Hōʻike maʻamau ka Boehmite i ka ʻili-like a i ʻole ka fibrous. He hōʻailona koʻikoʻi ka ʻano like ʻole no nā noi kiʻekiʻe-.

III. Ka Hoʻohui Kimia a me ka Maʻemaʻe
1. Hoʻohui Kemika: Hana ʻia ka loiloi nui o Al₂O₃ me ka hoʻohana ʻana i ka X-ray fluorescence spectroscopy (XRF) a i ʻole inductively coupled plasma optical emission spectroscopy (ICP-OES). Pono ka boehmite maʻemaʻe Al₂O₃ ʻoi aku ma mua o 95% a i ʻole like me 95%, ʻoiai ʻo ka boehmite maʻemaʻe kiʻekiʻe e koi ana i ka maʻemaʻe ʻoi aku ma mua o a i ʻole like me 99%.

2. ʻIke ʻino: ICP -MS a i ʻole atomic absorption spectroscopy (AAS) i hoʻohana ʻia no ka hoʻoholo ʻana i nā mea haumia e like me SiO₂, Fe₂O₃, a me Na₂O. Pono e kaupalena ʻia kā lākou ʻike e pale aku i ka pili ʻana i nā waiwai waiwai.

IV. Hōʻikeʻike Kūʻai Crystal
1.X-ray Diffraction (XRD): Hoʻohana ʻia nā peaks diffraction Bragg e hōʻoia i ka -AlOOH ʻano aniani o ka boehmite a helu i ke degere o ka crystallinity. Hōʻike ka boehmite maʻamau i nā piko diffraction hiʻona ma ka laulā 2θ o 14 degere a 35 degere. ʻO ka loaʻa ʻana o nā haumia (e like me -Al₂O₃) hiki ke hōʻike ʻia ma luna o-calcination.

2.Thermogravimetric Analysis (TGA): Hoʻomaʻamaʻa i ka 1000 degere i ka lewa lewa a me ka nānā ʻana i ka pihi pohō kaumaha. Hoʻopau maʻamau ka Boehmite i -Al₂O₃ ma waena o 300 degere a 500 degere. Hiki ke hoʻohana ʻia ka helu pohō kaumaha e hōʻoia i ka ʻike hydroxyl.

V. Ho'āʻo Hana Hana (Koho)

No nā noi kikoʻī, pono ke ana ʻana i ka pH (maʻamau 7-9), ka hoʻāʻo ʻana i ka ʻaila (no ka nānā ʻana i ka dispersibility), a i ʻole ka nānā ʻana i ka porosity (e like me ka mercury intrusion porosimetry) i koi ʻia e hoʻokō i nā koi kikoʻī o nā kākoʻo catalyst a i ʻole nā ​​mea pākaukau.

ʻO ka hōʻuluʻulu manaʻo, pono ke kaʻina hana hoʻāʻo boehmite i ka ʻimi -dimensional multi-dimensional e hui pū ana i ka nānā ʻana i ke kino, kemika, a me ka crystallographic e hōʻoia i ka hana paʻa a hilinaʻi a hāʻawi i ka hōʻoia maikaʻi no nā noi o lalo.