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- 주제어 : waste automotive catalyst(자동차 폐촉매) (검색결과 2 건)
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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-HNO<sub>3</sub> 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 HNO<sub>3</sub> >HCI >H<sub>2</sub>SO<sub>4</sub> >H<sub>3</sub>PO<sub>4</sub>. 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.
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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.
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