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공업화학(전기화학, 분석화학 포함) 촉매/반응공학 수열 합성법과 마이크로파 가열법으로 제조한 TS-1 촉매에 의한 페놀 수산화 반응: 용매의 영향
권송이 ( Song Yi Kwon ),윤성훈 ( Song Hun Yoon ),이종민 ( Jong Min Lee ),장종산 ( Jong San Chang ),이철위 ( Chul Wee Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.2
Catalytic activity such as conversion and selectivity on the phenol hydroxylation over TS-1 prepared by hydrothermal method and microwave heating method, respectively, was compared and discussed for understanding the dependence of solvent such as water, methanol, acetone, respectively, during phenol hydroxylation, with hydrogen peroxide. Basic physical properties such as XRD, EDS, SEM and N2 adsorption-desorption were determined and compared. The relationship between catalytic activity and physical properties of TS-1 was explained.
장종현,윤성훈,가복현,오승모,Jang, Jong H.,Yoon, Song-Hun,Ka, Bok H.,Oh, Seung M. 한국전기화학회 2003 한국전기화학회지 Vol.6 No.4
다공성 탄소전극의 전위에 짜른 EDLC(e)ectric double-layer capacitor)특성을 조사하기 위해 복소캐패시턴스분석(complex capacitance analysis)을 수행하였다. 하나의 원통형 기공에 대해 복소캐패시턴스를 이론적으로 유도하였고, 기공의 분포를 고려하여 다공성 전극에 대하여서도 계산하였다. 복소캐패시턴스의 허수부를 주파수에 대해 도시하면 피크 형태의 곡선이 얻어지는데, 이때 피크의 면적은 캐패시턴스 값의 크기와, 피크의 위치는 다공성전극의 전기화학 파라매터와 기공구조에 의해 결정되는 $\alpha_0$와 상관관계가 있음을 알 수 있었다. 이를 이용하면, 동일한 기공구조를 갖는 전극에 대해, 전위에 따른 캐패시턴스와 기공 내 이온전도도의 변화를 측정할 수 있다. 메조포러스 탄소전극에 대하여 전위를 변화시키며 electrochemical impedance spectroscopy를 측정하고 이를 복소캐패시턴스법에 의해 분석하였다. 피크 면적으로부터 구한 전위에 따른 캐패시턴스는 0.3V부근에서 최대값을 가졌는데, 이는 cyclic voltammetry 실험결과와도 일치하였다. 한편, 피크 위치로부터 구한 기공 내 이온전도도는 0.2V에서 최대 값을 가지고 전위가 증가할 수록 서서히 감소하였다. 이를 탄소 표면전하의 증가로 인해 이온/표면의 전기적 작용력이 커졌기 때문으로 해석하였다. The complex capacitance analysis was performed in order to examine the potential-dependent EDLC characteristics of porous carbon electrodes. The imaginary capacitance profiles $(C_{im}\;vs.\;log\lf)$ were theoretically derived for a cylindrical pore and further extended to multiple pore systems. Two important electrochemical parameters in EDLC can be estimated from the peak-shaped imaginary capacitance plots: total capacitance from the peak area and $\alpha_0$ from the peak position. Using this method, the variation of capacitance and ion conductivity in pores can be traced as a function of electric potential. The electrochemical impedance spectroscopy was recorded on the mesoporous carbon electrode as a function of electric potential and analyzed by complex capacitance method. The capacitance values obtained from the peak area showed a maximum at 0.3V (vs. SCE), which was in accordance with cyclic voltammetry result. The ionic conductivity in pores calculated from the peak position showed a maximum at 0.2 V (vs. SCE), then decreased with an increase in potential. This behavior seems due to the enhanced electrostatic interaction between ion and surface charge that becomes enriched at more positive potentials.
페놀의 수산화 반응에 사용한 TS-1 촉매의 효과적인 재생 방법(소성 온도 의존성)
권송이 ( Song Yi Kwon ),윤성훈 ( Song Hun Yoon ),엄경섭 ( Kyung Sub Um ),이재욱 ( Jae Wook Lee ),이철위 ( Chul Wee Lee ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.6
In this study, calcination temperature dependence of TS-1 catalyst was investigated in the hydroxylation of phenol with hydrogen peroxide during the regeneration of catalyst. Catalyst was regenerated 5 times by calcining at 550˚C and 700˚C, respectively. When the catalyst was regenerated at 550˚C after 5th regeneration phenol conversion was decreased from 22.9% to 15.1% and at 700˚C after 5th regeneration phenol conversion was decreased from 22.9% to 18.8%. For formation ratio of catechol/hydroquinone was increased from 1.28 to 1.45 after 5th regeneration at 550˚C, and from 1.28 to 1.20 after 5th regeneration at 700˚C. The main reasons for deactivation of the catalyst were suggested by analyzing chemical/physical properties with XRD, UV-vis spectra, N2 adsorption/desorption and TGA, and evaluating the catalytic activity such as phenol conversion and product selectivity.
리튬이차전지 양극재인 유기라디칼 고분자의 산화법에 대한 연구
이일복(Il Bok Lee),김영훈(Young Hoon Kim),문지연(Ji Yeon Moon),이철위(Chul Wee Lee),김다은(Da Eun Kim),하경수(Kyoung Su Ha),이동현(Dong Hyun Lee),손형빈(Hyung Bin Son),윤성훈(Song Hun Yoon) 한국고분자학회 2014 폴리머 Vol.38 No.6
라디칼 고분자화 반응 후 산화법을 이용하여 나티트록실 라디칼 고분자를 제조하였다. 두 가지 방법으로 산화된 라디칼 고분자의 라디칼 농도를 electroparamagnetic resonance spectroscopy(EPR) 법과 UV-visible absorption (UV-vis)방법을 통하여 측정하고 이를 통해 과산화수소수-Na2WO4법으로 산화하였을 때 라디칼 농도가 97.6% 정도 높게 얻어짐을 확인하였다. 또한 UV-vis 법은 정량적인 분석이 어려우나 대략적인 라디칼 형성 정도를 평가하는데 유용함을 확인하였다. 제조된 유기라디칼 고분를 리튬이온전지 양극재로 적용한 결과 우수한 용량, 초기효율, 높은 속도 특성을 가짐을 알수 있었다. An organic radical polymer (ORP) was prepared by radical polymerization and following oxidation intonitroxyl radical. Two different oxidation methods were employed and their radical concentrations were measured usingelectroparamagnetic resonance spectroscopy (EPR) and UV-visible absorption (UV-vis) spectroscopy. From these measurements,H2O2-Na2WO4 oxidation method exhibited a complete oxidation, which resulted in 97.6% spin concentration. Also, it was revealed that convenient and cheap UV-vis measurement was useful for preliminary radical concentrationcomparison. After applied as a cathode material in lithium ion batteries, ORP electrode showed a high initial capacity(110 mAh g-1), a good initial efficiency (96%), a very high rate performance (70% charging during 1.2 min) and stablecycle performance.