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Effects of Surface Characterization of γAl2O3 Particles by Aging in the Sol Preparation  

Yoo, Seung-Joon (Faculty of Environmental and Chemical Engineering, Seonam University)
Kwak, Dong-Heui (Faculty of Environmental and Chemical Engineering, Seonam University)
Kim, Hyeong-Gi (Division of Chemical and Biomolecular Engineering, Sogang University)
Hwang, Un-Yeon (Division of Chemical and Biomolecular Engineering, Sogang University)
Park, Hyung-Sang (Division of Chemical and Biomolecular Engineering, Sogang University)
Yoon, Ho-Sung (Division of Minerals Utilization and Materials, Korea Institute of Geology Mining & Materials)
Jang, Hee Dong (Division of Minerals Utilization and Materials, Korea Institute of Geology Mining & Materials)
Publication Information
Korean Chemical Engineering Research / v.46, no.3, 2008 , pp. 545-549 More about this Journal
Abstract
The surface characteristics of calcined ${\gamma}-Al_2O_3$ particles as well as ${\gamma}-AlO$(OH) sol particles were controlled by aging in the boehmite sol preparation. As a result of the study, the IEPs of ${\gamma}-AlO$(OH) particles were decreased from pH 9.25 to pH 8.70 and those of the calcined ${\gamma}-Al_2O_3$ particles were decreased from pH 9.90 to pH 8.86 by the increase of the aging times. As a result of the acidic and basic characterization of the calcined ${\gamma}-Al_2O_3$ particles by the aging, the amount of acid sites was decreased from 0.1367 mmol/g to 0.0783 mmol/g by the increase of the aging times and Hammett acidity, $H_o$ was showed the acidic strength of 4.8 or above. On the other hand, the amount of basic sites was decreased from 0.4399 mmol/g to 0.3074 mmol/g by the increase of the aging times. Based on these results, we proposed the fact that the aging step in the sol-gel process was an important step to control the surface characterization of ${\gamma}-Al_2O_3$ particles including acidity and basicity.
Keywords
${\gamma}-AlO$(OH); Aging; ${\gamma}-Al_2O_3$; Surface Characterization; Acidity;
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Times Cited By KSCI : 1  (Citation Analysis)
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