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Journal of the Korean Ceramic Society 1996;33(1): 92. |
| 깁사이트를 원료로 한 고온촉매용 담체의 제조 II, 비정질 알루미나의 담체 전구체로서의 특성 |
| 김성연, 김연식 |
| 서울대학교 공과대학 금속공학과 |
| Preparation of High-Temperature catalytic Support from Gibbsite II. Properties of Amophous Alumina as Precursor of Catalyst Support |
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| ABSTRACT |
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Amorphous alumina(AA) the precursor of ${gamma}$-alumina for catalyst support was made in the newly designed ball filled heating column. Some properties of AA as precursor were investigated. In observation of microstruc-ture and pore structure of AA and its derivatives scanning electronic microscope(SEM) and transmission electronic microscope(TEM) were used. It was found that the width of one particle in AA was 45~60$AA$ and the average distance among the particles ranged 9~12 $AA$ which suggested a micropore structure. When AA was reacted with water the shape of the surface was found to be altered and acicular bioehmite was formed inside AA which contributed inproved formability. Pore distribution was evaluated for the three samples of AA ground and granulated lump and La2O3 coated alumina. Acid sites were quantitatively determined by ammonia TPD method and the effect of impurity of Na on acid sites was discussed. Water adsorption capacity was evaluated in terms of a desiccant. |
| Key words:
Amorphous alumina, Pore size, Hydration, Formability, Acid site, Desiccant |
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