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공정시스템 , 이동현상 , 화학공정안전 : 졸 - 겔법에 의한 다공성 알루미나 미분체 제조에 관한 연구 - 1 . 물과 알콕시드의 비가 알루미나 미분체의 물리적 특성에 미치는 영향
황운연(Un Yeon Hwang),이성원(Sung Won Lee),이정운(Jung Woon Lee),박형상(Hyung Sang Park),구기갑(Kee Kahb Koo),김용렬(Yong Ryul Kim),윤호성(Ho Sung Yoon),유승준(Seung Joon Yoo) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.2
Porous alumina particles were prepared using a mixed solvent to control the reaction rate of Al-alkoxide and the particle shape. Monodispersed alumina particles with submicron size were obtained in the condition of [H₂O]/[Al-alkoxide] ratio of 2-8 in the mixed solvent. In contrast, precipitation of agglomerates and large powders were obtained in the condition of [H₂O/[Alalkoxide]≥15. As the increase of the [H₂O]/[Al-alkoxide] ratio, the crystal structure of as-prepared particles was continuously varied from amorphous Al(OH)₃ to pseudo-boehmite with chemical composition of AlO(OH). From BET analysis, the pore structure of the particles calcined at 600℃ had been changed from ink-bottle to open cylinder shape with increasing of dte [H₂O]/[Al-alkoxide] ratio. The specific surface area and pore diameter of samples calcined at 600℃ were 521-865 ㎡/g and 6.6-14 ㎚ respectively. The specific surface area of samples calcined at 1,100 ℃ was 35-120 ㎡/g respectively.