Kutholakale ukuthi i-Alumina ikhona okungenani izinhlobo ezingu-8, ziyi-α-Al2O3, θ-Al2O3, γ-Al2O3, δ-Al2O3, η-Al2O3, χ-Al2O3, κ-Al2O3 kanye ne-ρ-Al2O3, izakhiwo zazo zesakhiwo se-macroscopic nazo zihlukile. I-Gamma activated alumina iyikristalu ehlanganisiwe ecishe ibe yi-cubic, enganyibiliki emanzini, kodwa encibilikayo ku-asidi kanye ne-alkali. I-Gamma activated alumina iyisisekeli esibuthakathaka se-asidi, inephuzu lokuncibilika eliphezulu elingu-2050 ℃, ijeli ye-alumina ngesimo se-hydrate ingenziwa ibe yi-oxide ene-porosity ephezulu kanye nobuso obuthile obuphezulu, inezigaba zokuguquka ebangeni lokushisa elibanzi. Ekushiseni okuphezulu, ngenxa yokuphelelwa amanzi emzimbeni kanye ne-dehydroxylation, ubuso be-Al2O3 bubonakala buhambisana ne-oxygen engagcwalisiwe (isikhungo se-alkali) kanye ne-aluminium (isikhungo se-asidi), nomsebenzi we-catalytic. Ngakho-ke, i-alumina ingasetshenziswa njengomthwali, i-catalyst kanye ne-cocatalyst.
I-alumina esebenzayo ye-Gamma ingaba yi-powder, ama-granule, ama-strips noma ezinye. Singenza njengoba ufuna. I-γ-Al2O3, ebizwa ngokuthi "i-alumina esebenzayo", uhlobo lwezinto eziqinile ezisakazeka kalula, ngenxa yesakhiwo sayo se-pore esilungisekayo, indawo enkulu ethile, ukusebenza okuhle kokumuncwa, ubuso obunezinzuzo ze-acidity kanye nokuqina okuhle kokushisa, ubuso obune-microporous obunezakhiwo ezidingekayo zesenzo se-catalytic, ngakho-ke iba yi-catalyst esetshenziswa kakhulu, i-catalyst carrier kanye ne-chromatography carrier embonini yamakhemikhali namafutha, futhi idlala indima ebalulekile ekuqhekekeni kwamafutha, ekuhlanzeni i-hydrogenation, ekuguqulweni kwe-hydrogenation, ekuphenduleni kwe-dehydrogenation kanye nenqubo yokuhlanza ukukhishwa kwemoto. I-Gamma-Al2O3 isetshenziswa kabanzi njenge-catalyst carrier ngenxa yokulungiswa kwesakhiwo sayo se-pore kanye ne-acidity ebusweni. Uma i-γ-Al2O3 isetshenziswa njenge-catalyst carrier, ngaphezu kwalokho ingaba nemiphumela yokusabalalisa nokuzinzisa izingxenye ezisebenzayo, inganikeza futhi isikhungo esisebenzayo se-acid alkali, ukusabela okuhambisanayo nezingxenye ezisebenzayo ze-catalytic. Isakhiwo sembobo kanye nezakhiwo zobuso be-catalyst zincike ku-catalyst ye-γ-Al2O3, ngakho-ke i-catalyst esebenza kahle kakhulu ingatholakala ukuze kutholakale ukusabela okuthile kwe-catalytic ngokulawula izakhiwo ze-catalyst ye-gamma alumina.
I-alumina esebenzayo ye-gamma ngokuvamile yenziwa nge-pseudo-boehmite yayo yangaphambili ngokusebenzisa ukuphelelwa amanzi emzimbeni okuphezulu okungu-400 ~ 600℃, ngakho-ke izakhiwo ze-physicochemical ebusweni zinqunywa kakhulu yi-pseudo-boehmite yayo yangaphambili, kodwa kunezindlela eziningi zokwenza i-pseudo-boehmite, futhi imithombo ehlukene ye-pseudo-boehmite iholela ekuhlukeni kwe-gamma - Al2O3. Kodwa-ke, kulawo ma-catalyst anezidingo ezikhethekile kumthwali we-alumina, kunzima ukufeza kuphela ukulawula i-pseudo-boehmite yangaphambili, okumele kuthathwe ekulungiseleleni i-prophase kanye nokucubungula ngemuva kokuhlanganisa izindlela zokulungisa izakhiwo ze-alumina ukuze kuhlangatshezwane nezidingo ezahlukene. Lapho izinga lokushisa liphakeme kune-1000 ℃ ekusetshenzisweni, i-alumina iyenzeka ngemuva kokuguqulwa kwesigaba: γ→δ→θ→α-Al2O3, phakathi kwazo γ、δ、θ ziyi-cubic close packing, umehluko ukhona kuphela ekusatshalalisweni kwama-ion e-aluminium ku-tetrahedral kanye ne-octahedral, ngakho-ke lokhu kuguqulwa kwesigaba akubangeli ukushintshashintsha okukhulu kwezakhiwo. Ama-ion e-oxygen esigabeni se-alpha asondelene kakhulu, izinhlayiya ze-aluminium oxide zihlangana kabusha kakhulu, indawo ethile yobuso yehle kakhulu.
Gwema umswakama, gwema ukuskrola, ukuphonsa kanye nokushaqisa okukhulu ngesikhathi sokuthuthwa, izindawo ezingangeni imvula kufanele zilungiswe.
Kufanele igcinwe endaweni yokugcina izinto eyomile nengena umoya ukuze kuvinjelwe ukungcola noma umswakama.
