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Acidity Effect on the Catalytic Properties for Phenol Isopropylation
유정환,이철위,왕보,박상온,Yu, Jeong Hwan,Lee, Cheol Wi,Wang, Bo,Park, Sang On Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.3
Isopropylation of phenol with 2-propanol has been carried out over Na-exchanged ZSM-5 zeolites to determine the effect of catalyst acidity on phenol conversion and product selectivity. The acid type and strength of the catalyst such as Lewis, weak and strong Bronsted acid sites are measured by pyridine adsorbed XPS and the catalytic properties are interpreted in terms of the acid properties. The active site and mechanism for the reaction are suggested based on evidence of study from the reactant adsorbed FT-IR.
기계적 분쇄방법을 통한 코팅용 알루미나 졸의 제조 및 평가
유정환,정승화,조범래,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Jo, Bum-Rae,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국재료학회 2008 한국재료학회지 Vol.18 No.8
$Al_2O_3$ sol with long-term stability was prepared by mechanical milling. Thin films were evaluated and created for use as coating materials. The particle size of the manufactured sol was 98 nm when 2 wt% of nitric acid was added. This indicates that the viscosity of the sol is 12 cps and that it has long-term stability. The thickness of the thin films, which varied from 100 nm to 500 nm, could be managed by adjusting the draw rate and the amount of an organic additive. A thin film heated to $500^{\circ}C$ indicated a hydrophilic property against water and excellent permeability against a visible ray.
BLU 및 형광체 코딩용 알루미나 분산액의 제조 및 평가
유정환,정승화,홍경표,문종수,강종봉,Yu, Jeong-Hwan,Jung, Seung-Hwa,Hong, Gyung-Pyo,Mun, Jong-Soo,Kang, Jong-Bong 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
The suspension of $Al_2O_3$ which has long-term stability was made by mechanical milling. Thin films were evaluated and made to use as coating materials. A particle size of the suspension manufactured was 98 nm when 2 mt% nitric acid was added. It indicated that viscosity of the suspension is 12 cps and that it had the long-term stability. Thickness which was from 200 nm to 600 nm of the thin films was able to be made by adjusting draw rate and organic additive. Cracks of thin films at room temperature were prevented by adding Ethyl cellulose from 0.5 wt% to 2 wt%. The thin film heated at $500^{\circ}C$ indicated a hydrophilic property against water and an excellent permeability against a visible ray.