Alumina byagaragaye ko ibaho nibura mu buryo 8, ni α-Al2O3, θ-Al2O3, γ-Al2O3, δ-Al2O3, η-Al2O3, χ-Al2O3, κ-Al2O3 na ρ-Al2O3, imiterere yazo ya macroscopic nayo iratandukanye. Alumina ya Gamma ikora ni kristu ifatanye, idashonga mu mazi, ariko ishonga mu aside na alkali. Alumina ya Gamma ikora ni aside nke, ifite ubushobozi bwo gushonga ku rugero rwa 2050 ℃, alumina gel mu buryo bwa hydrate ishobora gukorwamo okiside ifite porosity nyinshi n'ubuso bwihariye bwinshi, ifite intera y'impinduka mu bushyuhe bwinshi. Iyo ubushyuhe buri hejuru, bitewe no kubura amazi no gutakaza amazi, ubuso bwa Al2O3 bugaragara nk'aho bufite ogisijeni idafite amazi (aho iri hagati y'ibice) na aluminiyumu (aho iri hagati y'ibice), hamwe n'imikorere ya catalytic. Kubwibyo, alumina ishobora gukoreshwa nk'umutwaro, catalyst na cocatalyst.
Alumina ya Gamma ishobora kuba ifu, utubumbe, uduce cyangwa ibindi. Dushobora gukora nk'uko ubikeneye. γ-Al2O3, yitwaga "alumina yakozwe", ni ubwoko bw'ibikoresho bikomeye bifite imyenge myinshi ikwirakwira, bitewe n'imiterere y'imyenge ihinduka, ubuso bunini bwihariye, imikorere myiza yo kuyungurura, ubuso bufite ibyiza bya aside n'ubushyuhe bwiza, ubuso bufite imyenge mito bufite imiterere ikenewe yo gukora catalytic, bityo ikaba catalytic, catalyst na chromatography bikoreshwa cyane mu nganda za shimi na peteroli, kandi igira uruhare runini mu gucukura amavuta, gutunganya hydrogenation, kuvugurura hydrogenation, reaction dehydrogenation na gahunda yo gusukura imyuka iva mu modoka. Gamma-Al2O3 ikoreshwa cyane nk'catalyst bitewe n'uburyo imiterere y'imyenge yayo ihinduka n'ubushyuhe bw'ubuso. Iyo γ-Al2O3 ikoreshejwe nk'icatalyst, kandi ishobora kugira ingaruka zo gukwirakwiza no gushimangira ibice bikora, ishobora kandi gutanga aside alkali active center, reaction synergistic hamwe n'ibice bikora catalytic. Imiterere y'imyenge n'imiterere y'ubuso bwa catalyst biterwa n'umuyoboro wa γ-Al2O3, bityo umuyoboro w'amashanyarazi ufite imikorere myiza waboneka kugira ngo hamenyekane uburyo bwihariye bwo gukora catalytic binyuze mu kugenzura imiterere y'umuyoboro w'amashanyarazi wa gamma alumina.
Alumina ikoreshwa na Gamma muri rusange ikorwa na pseudo-boehmite yayo ikoreshwa mu bushyuhe bwinshi bwa 400 ~ 600℃, bityo imiterere y’ubuso bwa fizikikemike igenwa ahanini na pseudo-boehmite yayo ikoreshwa mu buryo bwa pseudo-boehmite, ariko hari uburyo bwinshi bwo gukora pseudo-boehmite, kandi amasoko atandukanye ya pseudo-boehmite atuma habaho ubwinshi bwa gamma - Al2O3. Ariko, kuri izo catalysts zifite ibisabwa byihariye ku ruganda rwa alumina, kwishingikiriza gusa ku kugenzura pseudo-boehmite ikoreshwa mu buryo bwa pseudo-boehmite biragoye kugeraho, bigomba gufatwa mu gutegura prophase no gutunganya nyuma yo guhuza uburyo bwo guhindura imiterere ya alumina kugira ngo yuzuze ibisabwa bitandukanye. Iyo ubushyuhe buri hejuru ya 1000 ℃ mu ikoreshwa, alumina ibaho nyuma yo guhinduka mu cyiciro: γ→δ→θ→α-Al2O3, muri zo γ、δ、θ ni ibintu bifunganye, itandukaniro riri gusa mu ikwirakwizwa rya iyoni za aluminiyumu muri tetrahedral na octahedral, bityo iyi mpinduka mu cyiciro ntitera impinduka nyinshi mu miterere. Iyoni za ogisijeni mu cyiciro cya alpha zifatanye hafi ya hexagonal, uduce twa okiside ya aluminiyumu turahurira hamwe cyane, ubuso bwihariye bwaragabanutse cyane.
lIrinde ubushuhe, irinde gukaraba, gutera no guturika cyane mu gihe cyo gutwara, ibikoresho bidashobora kugwa imvura bigomba kuba byateguwe.
Igomba kubikwa mu bubiko bwumye kandi bufite umwuka uhagije kugira ngo hirindwe kwanduzwa cyangwa ubushuhe.
