자동차 폐촉매의 물리 화학적 특성

서성규(Seong Gyu Seo),문정선(Joung Sun Moon) 大韓環境工學會 2000 대한환경공학회지 Vol.22 No.5

산처리된 자동차 폐촉매의 VOCs 연소 성능평가

서성규 ( Seo Seong-gyu ),문정선 ( Moon Joung-sun ),조성용 ( Cho Sung-yong ) 한국환경기술학회 2000 한국환경기술학회지 Vol.1 No.2

본 연구는 자동차 폐촉매의 재활용 가능성을 검토하기 위하여 산처리에 따른 촉매의 VOCs 연소활성에 관하여 조사하였다. 자동차 폐촉매의 물리화학적 특성을 조사하기 위하여 EA(Elemental analyzer) 및 ICP-AES(Inductively coupled plasma-atomic emission spec-trophotometer) 분석을 실시하였다. Pt, Pd 및 Rh 중 Pt가 가장 많이 함유되어 있었으며, 귀금속 함유량은 주행거리가 길수록 감소하는 경향을 보였다. 침적 carbon의 제거를 위하여 공기를 이용한 전처리 영향을 조사한 결과, 400℃에서 1hr동안 전처리 했을 때 가장 우수한 활성을 보였다. 또한, 자동차 폐촉매에 함유되어 있는 피독 물질 제거 및 재생에 의한 촉매활성을 증가시키기 위하여 0.1N의 순으로 활성이 나타났다. 0.1N-HNO₃ 산처리 촉매에 대한 접촉시간(W/F) 영향은 접촉시간이 증가할수록 acetaldehyde의 연소활성이 증가하였다. acetaldehyde에 대한 LEL(Lower Explosive Limit : 4%)의 25%에 해당하는 1 mole% 이하에서 반응물 농도에 따른 mol% 이하, 반응온도 280℃ 이상, 접촉시간(W/F)이 1.56 g-cat.hr/g-mol 이상일 때 국내 법규상 VOCs 처리시설의 처리효율 기준인 90% 이상의 전화율을 보였다. 산처리한 자동차 폐촉매를 이용한 VOCs 연소활성은 매우 우수하였으며, 향후 소규모 VOCs 배출원 제어용 기술로서의 적용가능성을 보였다. On the study, the waste automotive catalyst was treated by acid, and the effects of the Acid treatment on VOCs combustion activities were evaluated The physic-chemical Characteristics of waste automotive catalyst were examined by EA(Elemental analyzer) and ICP-AES(Inductively coupled plasma-atomic emission spectrophotometer) analysis. Compared to the Pd and Rh contents in the waste automotive catalysts, the Pt was contained in the highest level, and the content levels of precious metals decreased with increasing mileage. The air was introduced to the waste catalyst with heating to remove the deposited carbon On the catalyst surface, and the result of this pretreatment showed the highest catalytic activity in using 400℃ for 1 hour. In addition, the waste catalyst was treated with the various types of acid(0.1N) to eliminated poison materials besides to increase the catalytic activity. The effects of acid types on the catalytic activity were improved by the order of HNO₃ >HCI >H₂SO₄ >H₃PO₄. The combustion activity of acetaldehyde also enhanced With increasing the contact time(W/F). The destruction efficiency of acetaldehyde was Evaluated with the variation of reaction temperature and its concentration. The tested Acetaldehyde concentration was below 1 mole %, which was 25% of the LEL(Low Explosive Limits). According the results of the experiments, the VOCs destruction efficiency was higher than 90%), and be utilized to control the VOCs from small size industries.

김 양식 산처리제용 유기산의 특성 (Ⅰ)

서성규(Seong Gyu SEO),문정선(Joung Sun MOON),신종암(Jong Agn SHIN),이원교(Won Kyo LEE),김상채(Sang Chai KIM) 전남대학교 수산과학연구소 1998 수산과학연구소논문집 Vol.7 No.-

To investigate the possibility as an organic acid treatment in the cultivating Porphyra, 21 species of organic acid were examined for the chemical characteristics, pH, the effect of concentration, dilution, salinity and mixed organic acid. L-, D-, DL-Aspartic acid and Fumaric acid were not soluble in water. 0.1M Oxalic acid has pH=1.55, this value is the lowest pH in the examined organic acids. Salt effect was observed in the same concentration of organic acid, that is, pH of solution was decreased with increasing the salinity of solvent. The linear relationship between pKa1 and pH was positive and correlation coefficient was r=0.9738. The synergic effect was not observed in the mixture of citric acid and oxalic acid. pH variation was simple with the relative amount of each component in mixed organic acid.

자동차 폐촉매를 이용한 휘발성유기화합물(VOC)의 제어기술

서성규,문정선 여수대학교 1999 論文集 Vol.14 No.2

The characteristics and the combustion activities of a waste automotive catalyst were carried out in this study. Methanol was selected as a model VOC(Volatile Organic Compound) and the combustion activity was examined in a fixed bed reactor. The characteristics of waste automotive catalyst was investigated by EA(Elemental Analysis). ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrophotometer) and BET(Brunauer-Emmett-Teller) analysis. Carbon deposit amount was decreased with increasing pretreatment temperature and air. Conversion of methanol at the reaction temperature of 100℃ was above 90% on the regenerated catalyst with air,60cc/min,400℃.1hr. The selectivities of HCHO and HCOOCH₃were decreased with increasing reaction temperatures. And combustion activity of a waste automotive catalyst was decreased with mileage. Catalytic activity of a waste automotive catalyst for methanol combustion was increased with acid treatment, and the order of acid effect was summarized as follows : HNO₃>HCL>H₂SO₄>CH₃COOH. Finally, we might say that the regenerated waste automotive catalyst by regeneration method has a excellent catalytic activity for VOC combustion.

자동차 폐촉매의 특성 및 VOCs 연소활성

서성규,문정선 麗水大學校 産業基術硏究所 1999 産業基術硏究所 論文集 Vol.8 No.-

The characterization of waste automotive catalyst was examined by EA(Elemental Analysis) and ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrophoto meter) analysis. The content of Pt, Pd and Rh in waste automotive catalyst was 1,228ppm, and 233ppm in Excel and 581ppm, 1,883ppm, and 255ppm in Pride. The combustion performance of waste automotive catalyst was investigated for acetaldehyde and toluene as a model VOCs in a fixed bed reactor at atmospheric pressure. The number of estimated waste automotive catalyst was 427,520 in 1997. Carbon deposit amount was higher in front brick than rear brick of catalyst, and increased with mileage. Catalytic activity of waste automotive catalyst for acetaldehyde and toluene combustion was very excellent, and decreased with mileage.

대학캠퍼스와 광양만 주변지역의 대기질에 관한 연구

서성규,이선원,문정선 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-

By the air quality standard of korea, the 7 major pollutants should be continuously monitored; that is SO_(2), NO_(2), O_(3), CO, PM10, TSP and Pb, At present, air monitoring system is furnished at 6 site around Kwangyang-bay which has been assigned to the air pollution special measure area as well as the air quality regulation area. According the measurement results of the university campus, the present levels of pollutants were not exceed the limit level of air quality standard, but the levels of some pollutants were high at special period of a day. It may be recommended to monitor continuously for the long-term. The monitoring results of SO_(2), NO_(2), O_(3) and CO showed that SO_(2), NO_(2) and CO level were well within the limit levels of air quality standard. The O_(3) levels were not exceed the limit levels of air quality standard, but high enough to concern based on one and eight hour average levels. Especially for monitoring data at Weollae-dong district The O_(3) levels were approaching the limit levels of air quality standard. The pattern of O_(3) and NO_(2) increase due to the photo-oxidation in the industrial district was not similar th that residential district

석유화학 BTX 공정 점토탑에서의 악취 및 공정 부식 방지에 관한 연구

서성규,정채훈,문정선 여수대학교 산업기술지역개발연구소 2000 産業基術硏究所 論文集 Vol.9 No.-

offensive odors affect man's olfactory sense and cause repulsiveness. In recent years, the problem of offensive odors is becoming more complicated and diversed. The emitted offensive odors from petrochemical BTX process gave rise to a serious corrosion problem of benzene tower and offensive odor problem. The main purpose in this study is to investigate process corrosion and odor generation from clay tower of petrochemical BTX process which were assumed to be the conversion of sulfur compounds over clay into hydrogen sulfide. As a result of this study, when traces of thiophenes and mercaptans are present in the clay tower, these components are broken down by the clay. The forming H□S in this step will be concentrated in the benzene tower top. In order to remove the occurred hydrogen sulfide, Fe-chelate catalyst is used. Removing efficiency is better than 99%.