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최욱(Ook Choi),경대현(Dae-Hyun Kyung),박영성(Yeong-Seong Park) 한국청정기술학회 2014 청정기술 Vol.20 No.3
본 연구에서는 γ-Al₂O₃에 구리를 함침시킨 촉매를 고정층 반응기에 충전시킨 후 휘발성유기물질(VOCs)인 벤젠의 촉매산화 반응특성을 살펴보았다. 실험조건은 반응온도 200~500 ℃, 벤젠의 농도 400~650 ppm, 가스유입량 50~100 cc/min, 공간속도 7,500~22,500 hr<SUP>-1</SUP>의 범위로 적용하였다. BET분석, 주사전자현미경(SEM), 열천칭(TGA) 분석을 통해 제조된 촉매의 물성을 조사하였으며, 벤젠의 촉매산화반응의 전환율에 대하여 고찰하였다. 실험결과, 벤젠의 농도와 공간속도가 낮아질수록 벤젠산화반응의 전환율은 증가함을 알 수 있었다. 벤젠의 촉매산화반응은 1차 균일반응으로 해석될 수 있었으며, 반응의 활성화 에너지(Ea)는 17.2 kcal/mol, 빈도인자(A)는 1.33 × 10<SUP>6</SUP> sec<SUP>-1</SUP>이었다. Catalytic oxidation characteristics of benzene as a VOC was investigated in a fixed bed flow reactor using Cu/γ-Al₂O₃ catalyst. The parametric tests were conducted at the reaction temperature range of 200~500 ℃, benzene concentration of 400~650 ppm, gas flow rate of 50~100 cc/min, and space velocity range of 7,500~22,500 hr<SUP>-1</SUP>. The property analyses by using the BET, SEM, TGA and the conversion of catalytic oxidation of benzene were examined. The experimental results showed that the conversion was increased with decreasing benzene concentration, gas flow rate and space velocity. Benzene oxidation reaction over Cu/γ-Al₂O₃ catalyst could be expressed as the first order homogeneous reaction of which the activation energy was 17.2 kcal/mol and frequency factor was 1.33 × 10<SUP>6</SUP> sec<SUP>-1</SUP>.
박석균(Park Seok-Kyun),최욱(Choi Ook) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Electromagnetic wave radar method and electromagnetic induction method are applied many times for detecting reinforcing bars in concrete nondestructively in case of diagnosis of concrete structures. By the way, these methods have an error accompanying tested reinforcing bars in concrete because there are many uncertainty factors. So, it is necessary to study for an error of these methods affected by these uncertainty factors. Errors accompanying tested position and cover depth of reinforcing bars in concrete are analyzed in this study.