Kufunyenwe ukuba i-Alumina ikhona ubuncinane kwiifom ezisi-8, ziyi-α-Al2O3, θ-Al2O3, γ-Al2O3, δ-Al2O3, η-Al2O3, χ-Al2O3, κ-Al2O3 kunye ne-ρ-Al2O3, iipropati zazo zesakhiwo se-macroscopic nazo zahlukile. I-Gamma activated alumina yikristale evaliweyo ye-cubic, enganyibilikiyo emanzini, kodwa inyibilikayo kwi-asidi kunye ne-alkali. I-Gamma activated alumina yinkxaso ye-asidi ebuthathaka, ine-high melting point 2050 ℃, ijeli ye-alumina kwimo ye-hydrate ingenziwa ibe yi-oxide ene-porosity ephezulu kunye nomphezulu othile ophezulu, inezigaba zotshintsho kuluhlu olubanzi lobushushu. Kubushushu obuphezulu, ngenxa yokuphelelwa ngamanzi emzimbeni kunye ne-dehydroxylation, ubuso be-Al2O3 bubonakala buhambelana ne-oxygen engagcwaliyo (iziko le-alkali) kunye ne-aluminium (iziko le-asidi), kunye nomsebenzi we-catalytic. Ke ngoko, i-alumina ingasetyenziswa njengomthwali, i-catalyst kunye ne-cocatalyst.
I-alumina esebenzayo yeGamma inokuba ngumgubo, iigranules, imicu okanye ezinye. Singenza ngokwemfuno yakho. γ-Al2O3, eyayibizwa ngokuba yi-"activated alumina", luhlobo lwezinto eziqinileyo ezisasazekayo ezinemingxuma ephezulu, ngenxa yesakhiwo sayo semingxuma esihlengahlengiswayo, indawo enkulu ethile yomphezulu, ukusebenza kakuhle kwe-adsorption, umphezulu onezibonelelo ze-acidity kunye nokuzinza okuhle kobushushu, umphezulu wemingxuma emincinci oneempawu ezifunekayo zesenzo se-catalytic, ngoko ke iba yi-catalyst esetyenziswa kakhulu, i-catalyst carrier kunye ne-chromatography carrier kwishishini leekhemikhali neoyile, kwaye idlala indima ebalulekileyo kwi-oil hydrocracking, i-hydrogenation refinement, i-hydrogenation reforming, i-dehydrogenation reaction kunye nenkqubo yokucoca i-exhaust yemoto. I-Gamma-Al2O3 isetyenziswa kakhulu njenge-catalyst carrier ngenxa yokulungelelaniswa kwesakhiwo sayo semingxuma kunye ne-acidity yomphezulu. Xa i-γ-Al2O3 isetyenziswa njenge-catalyst carrier, inokuba nefuthe lokusasaza nokuzinzisa izinto ezisebenzayo, ikwabonelela nge-acid alkali active centre, i-synergistic reaction kunye ne-catalytic active components. Ulwakhiwo lwembobo kunye neempawu zomphezulu we-catalyst zixhomekeke kwi-catalyst ye-γ-Al2O3, ngoko ke i-catalyst esebenza kakuhle iya kufunyanwa kwi-catalytic reaction ethile ngokulawula iimpawu ze-gamma alumina carrier.
I-alumina esebenzayo yeGamma ngokubanzi yenziwe nge-pseudo-boehmite yayo yangaphambili ngokusebenzisa i-400 ~ 600℃ ukuphelelwa ngamanzi kubushushu obuphezulu, ngoko ke iipropati ze-physicochemical kumphezulu zimiselwa kakhulu yi-pseudo-boehmite yayo yangaphambili, kodwa kukho iindlela ezininzi zokwenza i-pseudo-boehmite, kwaye imithombo eyahlukeneyo ye-pseudo-boehmite ikhokelela kulwahlulo lwe-gamma - Al2O3. Nangona kunjalo, kwezo catalysts ezineemfuno ezikhethekileyo kwi-alumina carrier, kunzima ukuzifezekisa kuphela kulawulo lwe-pseudo-boehmite yangaphambili, kufuneka zithathwe kulungiselelo lwe-prophase kunye nokucubungula emva kokudibanisa iindlela zokulungisa iipropati ze-alumina ukuhlangabezana neemfuno ezahlukeneyo. Xa ubushushu buphezulu kune-1000 ℃ ekusetyenzisweni, i-alumina iyenzeka emva kokuguqulwa kwesigaba: γ→δ→θ→α-Al2O3, phakathi kwazo i-γ、δ、θ zi-cubic close packing, umahluko ulele kuphela ekusasazweni kwee-ion ze-aluminium kwi-tetrahedral kunye ne-octahedral, ngoko olu tshintsho lwesigaba alubangeli utshintsho olukhulu kwizakhiwo. Ii-ion zeoksijini kwisigaba se-alpha zisondelelene kakhulu, amasuntswana e-aluminium oxide adibana kakhulu, indawo ethile yomphezulu yehla kakhulu.
Kuphephe ukufuma, kuphephe ukuskrola, ukuphosa kunye nokuthuthumela okubukhali ngexesha lokuthuthwa, izixhobo ezithintela imvula kufuneka zilungiswe.
Ifanele igcinwe kwindawo yokugcina izinto eyomileyo nengena umoya ukuthintela ungcoliseko okanye ukufuma.
