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연구 논문 : Mn/CeO2와 Mn/ZrO2 촉매 상에서 NH3를 사용한 NO의 선택적 촉매 산화 반응
고정휘 ( Jeong Huy Ko ),박성훈 ( Sung Hoon Park ),전종기 ( Jong Ki Jeon ),손정민 ( Jung Min Sohn ),이시훈 ( See Hoon Lee ),박영권 ( Young Kwon Park ) 한국공업화학회 2012 공업화학 Vol.23 No.1
본 연구에서는 저온에서 질소산화물 저감효율이 뛰어난 것으로 알려진 망간전구체의 종류에 따른 영향을 고찰하기 위해 초임계수열법으로 합성한 세리아(CeO2)와 지르코니아(ZrO2)를 담체로 하여 저온 SCR 공정에서의 온도에 따른 활성변화를 비교 분석하였다. Manganese acetate (MA)와 Manganese nitrate (MN), 두 종류 망간전구체의 농도를 영향인 자로 고려하여 촉매의 활성변화를 고찰하였다. 활성화된 시료의 특성은 N2 adsorption-desorption, TGA, XRD, XPS를 통해 분석하였고 질소산화물 저감효율을 측정하기 위해 NOx 분석기를 이용하여 De-NOx 실험을 수행하였다. 제조방법에 따라 합성한 촉매의 질소산화물 저감 효율을 분석한 결과 Manganese acetate (MA)를 활성물질로 사용한 촉매가 Manganese nitrate (MN)을 사용한 촉매에 비해 전체적인 온도 영역에서 우수한 질소산화물 저감효율을 보였다. 이는 특성분석 결과를 통해 알 수 있듯이 Manganese acetate (MA)의 주성분인 Mn2O3가 Manganese nitrate (MN)의 주성분인 MnO2에 비해 높은 산소 이동도를 갖고 담체와의 강한 상호작용을 형성하는 것에 기인한 것으로 보인다. Manganese (Mn) catalysts were generated using CeO2 and ZrO2 supports synthesized by the supercritical hydrothermal method and two different Mn precursors, aimed at an application for a low-temperature selective catalytic reduction process. Manganese acetate (MA) and manganese nitrate (MA) were used as Mn precursors. Effects of the kind and the concentration of the Mn precursor used for catalyst generation on the NOx removal efficiency were investigated. The characteristics of the generated catalysts were analyzed using N2 adsorption-desorption, thermo-gravimetric analysis, X-ray diffraction, and X-ray photoelectron spectroscopy. De-NOx experiments were carried out to measure NOx removal efficiencies of the catalysts. NOx removal efficiencies of the catalysts generated using MA were superior to those of the catalysts generated using MN at every temperature tested. Analyses of the catalyst characteristics indicated that the higher NOx removal efficiencies of the MA-derived catalysts stemmed from the higher oxygen mobility and the stronger interaction with support material of Mn2O3 produced from MA than those of MnO2 produced from MN.
성인 여성의 연령에 따른 체구성 분포변화와 골밀도에 미치는 체구성 요인의 영향
정일규(Ill Gyu Jeong),김명기(Myong Gi Kim),이강우(Kang Woo Lee),손정민(Jeong Min Sohn),최철승(Chul Seung Choi) 한국사회체육학회 1999 한국사회체육학회지 Vol.11 No.-
This study was done in order to investigate the changes of segmental body composition, ie, body fat, FFM, and bone mineral content(BMC) according to aging in Korea adult woman and to evaluate the effect of body components on the bone mineral density. The subjects were composed of 86 healthy adult women who were 17 - 66 years old and they were divided three groups according to age(A group : 17-30 yrs., B groups : 31-50 yrs., C groups : more than 51 yrs.). The results were as follows : 1. Among the body components, fat mass had the highest correlation with the weight (r=0.9037. p≤0.001) and each segmental FFM showed the greatest influence on bone mineral content (r = 0.49 - 0.67) and followed by weight and body fat. 2. A significant difference among three age groups was not discovered in muscle mass of arm and trunk region, but the muscle mass in leg region represented the remarkable declination acording to aging(p≤0.001). 3. The fat mass of arm and trunk region in C groups(≥51yrs) were significantly higher than that in younger groups(p=0.003) and the fat mass of leg region in a group (17-30yrs) was significantly lower than that in older groups(p=0.001). 4. C group(≥51yrs) had significantly lower total BMC, total BMD and every segmental BMC than younger age groups(p=0.0000-0.0006). These results suggest that in about the period of menopause in women proper diet balance and weight-bearing exercise may be required to prevent from the abrupt decrease of BMD and muscle mass, especially in leg region, and the increase of body fat, especially in trunk region.