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Model soot이 Pt/CeO₂ 촉매와 tight contact한 상태에서의 O₂에 의한 산화특성 연구
송창훈(Changhoon Song),이동일(Dongil Lee),김태수(Taesoo Kim),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The catalytic behaviors of Pt/CeO₂ have been studied for soot oxidation by O₂. Oxidation of soot (carbon black) is studied using a flow reactor system simulating the condition of diesel exhaust. In this study, the temperature programmed oxidation (TPO) scheme is used. And soot oxidation rate is evaluated by monitoring both CO and CO₂ concentrations. Pt/CeO₂ catalyst shows promising performance to accelerate the soot-O₂ reaction. Under tight contact condition with catalyst, soot oxidation reaction occurred more actively. The maximum soot oxidation temperature is decreased by about 150℃. The main reason that causes the increase of soot oxidation activity is the active oxygen from cerium oxide.
광학식 입자 계수기 내 샘플 노즐 직경이 측정 효율 및 특성에 미치는 영향에 대한 실험적 연구
송현우,김태욱,송순호,Song, Hyunwoo,Kim, Taewook,Song, Soonho 한국입자에어로졸학회 2017 Particle and Aerosol Research Vol.13 No.4
The detection efficiency and characteristics of an optical particle counter (OPC), with various sample nozzle outlet diameters, were experimentally investigated. The OPC system, which was built with original design, was made up of a diode laser, two photodetectors, and a variety of optics such as a beam splitter and a concave mirror. The cone-shaped sampling nozzle was designed to be changeable to alter the outlet diameter, within the range of 1 to 3 mm. For samples, sets of polystyrene latex (PSL) standard particle with various sizes of 1 to $3{\mu}m$, were used. As a result, detection efficiency of the OPC greatly decreased with larger nozzle outlet diameter. Moreover, increased nozzle outlet diameter means broader sample flow, thus caused light interference and multiple scattering which results in abnormal high peaks in scattered light signal. The ratio of abnormal peaks to regular signal of single particle increased with larger nozzle outlet diameter.