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- 검색키워드
- 저자 : Gi Bbum Lee (검색결과 24 건)
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Comparison of by‑product gas composition by activations of activated carbon
Gi Bbum Lee,Jung Eun Park,Sang Youp Hwang,Ji Hyun Kim,Seokhwi Kim,Ho Kim,Bum Ui Hong 한국탄소학회 2019 Carbon Letters Vol.29 No.3
In this study, commercial activated carbons (ACs) were upgraded by different activation methods, and the gases generated during the activations were defined and quantified. The chemical activation commonly applied for upgrading ACs uses complex reactions, involving pyrolysis, physical, and chemical reactions. The ACs based on wood materials were characterized by elemental analysis, N2 physisorption, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption mass spectrometry. The patterns and composition of the generated gases were analyzed by gas chromatography and X-ray diffraction; high-resolution scanning electron microscopy was also used to characterize the activated carbon. The AC was mostly decomposed to CO2 by pyrolysis and physical activation, while CO was mainly detected during chemical activation from the K2CO3 produced by the reactions between CO2 and K2O. The detected amounts of generated gases were differed at various KOH ratios and residence times. The highest surface area obtained in this study was 2000 m2/g at the optimum ratio of AC and KOH (1:2).
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단신 : Ti 함유 제올라이트 촉매를 이용한 디시클로펜타디엔의 선택적 에폭시화 반응
이기쁨 ( Gi Bbum Lee ),고문규 ( Moon Kyo Ko ),김영운 ( Young Wun Kim ),정근우 ( Keun Wo Chung ),윤병태 ( Byun Tae Yoon ),김성보 ( Seong Bo Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.6
Ti-containing zeolite was synthesised and used in the epoxidation of di-cyclopentadiene (DCPD). Among various Ti-zeolite catalysts, Y contained Ti-zeolite showed the highest yield in the epoxidation of DCPD. The study was also investigated in terms of the Ti content in the catalysts, H2O2/substrate ratio, reaction temperature and applied time. The reaction conditions significantly influenced on both the catalytic activity and selectivity. In addition, Ti structure in the zeolite was analyzed using IR and UV-vis spectroscopy.
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Development of a preservation system for edible/medicinal mushroom resources in Korea
Kang-Hyo Lee,Jae-Gu Han,Jae Han Cho,Ok-Ryeol Kim,Gi-Bbum Nam,Min-Woo Hyun 한국버섯학회 2016 버섯 Vol.20 No.1
Recent enactments of the Nagoya Protocol and UPOV convention precipitated international competition to secure biological resources. To address these challenges in the case of mushroom industry, collecting and preserving the genetic resources are urgently needed. Mushroom Research Division, National Institute of Horticltural and Herbal Science, Rural Development Administration, has operated mushroom resource management facilities which consist of eight separate rooms with automatic temperature and humidity controllers for the safe preservation of mycelial cultures or voucher herbarium specimens. During the past three years the liquid-nitrogen (LN) cryogenic system for the permanent/semi-permanent preservation of the strains commercially or scientifically important are successfully installed, and the computerized resource management system using QR code are adopted. Up to now, 1,586 strains of 261 species in 79 genus of edible and medicinal mushrooms were preserved.
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Electrochemical Capacitance of Activated Carbons Regenerated using Thermal and Chemical Activation
Park, Jung Eun,Lee, Gi Bbum,Hwang, Sang Youp The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3
Spent activated carbons (SACs) collected from a water treatment plant were regenerated and then adopted as electrochemical material in capacitors. The SACs used in this study were regenerated via two steps, namely thermal and chemical activation. However, during the activation process, the adsorbates were converted into ashes, which caused pore blockage and decreased specific surface area. The regenerated SACs were washed with acid solutions with different levels of acidity (strong: HCl, mild: H<sub>3</sub>PO<sub>4</sub>, and weak: H<sub>2</sub>O<sub>2</sub>) to remove the ashes. The regenerated SACs washed with HCl exhibited the highest specific surface area, although their capacitance was not the highest. Conversely, the specific surface area of regenerated SACs washed using H<sub>3</sub>PO<sub>4</sub> was slightly lower than that of HCl, but exhibited higher capacitance and electrochemical stability. Although the strong acid removed the generated ashes in the pores efficiently, it could adversely affect their structural stability, which would lead to lower capacitance.
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