Achọpụtala alumina ka ọ dị ma ọ dịkarịa ala ụdị 8, ha bụ α- Al2O3, θ-Al2O3, γ- Al2O3, δ- Al2O3, η- Al2O3, χ- Al2O3, κ- Al2O3 na ρ- Al2O3, ihe owuwu macroscopic nke ha. dịkwa iche iche. Gamma na-arụ ọrụ alumina bụ kristal nwere cubic nso, nke a na-apụghị ịsotu na mmiri, mana soluble na acid na alkali. Gamma na-arụ ọrụ alumina bụ nkwado acidic na-adịghị ike, nwere ebe mgbaze dị elu 2050 ℃, alumina gel na ụdị hydrate nwere ike ime ka ọ bụrụ oxide nwere oke porosity na elu dị elu, ọ nwere usoro mgbanwe na oke okpomọkụ. Na elu okpomọkụ, n'ihi akpịrị ịkpọ nkụ na dehydroxylation, Al2O3surface na-egosi nhazi unsaturated oxygen (alkali center) na aluminum (acid center), na catalytic ọrụ. Ya mere, enwere ike iji alumina mee ihe dị ka onye na-ebu, ihe na-akpata na cocatalyst.
Gamma arụ ọrụ alumina nwere ike ịbụ ntụ ntụ, granules, ibe ma ọ bụ ndị ọzọ. Anyị nwere ike ime dị ka gị chọrọ.γ-Al2O3, a na-akpọ “arụ ọrụ alumina”, bụ ụdị porous elu dispersion siri ike ihe, n'ihi na nke mgbanwe pore Ọdịdị, nnukwu kpọmkwem elu ebe, ezi adsorption arụmọrụ, elu na uru nke acidity. na ezi thermal kwụsie ike, microporous elu na chọrọ Njirimara nke catalytic edinam, ya mere na-aghọ ndị kasị n'ọtụtụ ebe na-akpali akpali, catalyst ụgbọelu na chromatography ụgbọelu na chemical na mmanụ ụlọ ọrụ, na-arụ ọrụ dị mkpa na mmanụ hydrocracking, hydrogenation refining, hydrogenation reforming, Dehydrogenation mmeghachi omume na ụgbọala iyuzucha ọcha usoro.Gamma-Al2O3 ọtụtụ-eji dị ka catalyst ebu n'ihi na nke adjustability nke pore Ọdịdị na elu acidity. Mgbe γ- Al2O3 na-eji dị ka a ụgbọelu, e wezụga nwere ike inwe mmetụta na-achụsasị na stabilize nọ n'ọrụ components, nwekwara ike inye acid alkali arụ ọrụ center, synergistic mmeghachi omume na catalytic arụ ọrụ components. Ọdịdị pore na ihe ndị dị n'elu nke ihe na-akpata na-adabere na ụgbọelu γ-Al2O3, ya mere a ga-achọta onye na-ebu ọrụ dị elu maka mmeghachi omume catalytic kpọmkwem site na ịchịkwa njirimara nke gamma alumina carrier.
Gamma na-arụ ọrụ alumina na-emekarị nke precursor pseudo-boehmite site na 400 ~ 600 ℃ elu okpomọkụ akpịrị ịkpọ nkụ, ya mere elu physicochemical Njirimara na-n'ụzọ dị ukwuu kpebisiri ike site precursor pseudo-boehmite, ma e nwere ọtụtụ ụzọ ime pseudo-boehmite, na dị iche iche isi mmalite. nke pseudo-boehmite na-eduga na ụdị gamma dị iche iche - Al2O3. Otú ọ dị, ka ndị catalysts na pụrụ iche chọrọ ka alumina ụgbọelu, naanị ịdabere na akara nke precursor pseudo-boehmite siri ike nweta, a ga-ewere prophase nkwadebe na post nhazi ijikọta na-eru nso ka mezie Njirimara nke alumina izute dị iche iche chọrọ. Mgbe okpomọkụ dị elu karịa 1000 ℃ na-eji, alumina emee na-esonụ na-adọ mgbanwe: γ→δ→θ→α-Al2O3, n'etiti ha γ、δ、θ bụ cubic nso mbukota, ihe dị iche naanị dabeere na nkesa nke aluminum ion na. tetrahedral na octahedral, yabụ ngbanwe nke oge a anaghị akpata mgbanwe dị ukwuu nke ihe owuwu ahụ. ion oxygen na alfa frasi bụ hexagonal nso mbukota, aluminom oxide particles bụ nnukwu nchikota, kpọmkwem n'elu ala jụrụ nke ukwuu.
Zere mmiri mmiri, zere ịpịgharị, ịtụba na ihe na-awụ akpata oyi n'ahụ n'oge njem, ekwesịrị ịkwado ụlọ ọrụ mmiri ozuzo.
Ekwesịrị idowe ya n'ụlọ nkwakọba ihe kpọrọ nkụ na ikuku ikuku iji gbochie mmetọ ma ọ bụ mmiri mmiri.
