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촉매연소기용 귀금속 촉매와 조촉매의 열적 내구특성 연구
최병철,고병운,김명환,신혁,Choi, Byungchul,Ko, Byeongwoon,Kim, Myeonghwan,Sin, Hyeok 한국교통대학교 융복합기술연구소 2020 융ㆍ복합기술연구소 논문집 Vol.10 No.1
The purpose of the study is to investigate the thermal durability characteristics of the Pt catalyst and additives used in a catalytic combustor. The catalyst used in the experiment was based on Pt (3 wt%), and a total of 12 types were prepared using a combination of additives (Ni, La, Ce, Fe, and Co). From the results, In the fresh state, the two types of combination catalysts with the highest C<sub>3</sub>H<sub>8</sub> conversion were Pt_Ce (79.9%) at 500℃, and in the three types of combination catalysts, Pt_La_Ni (93.4%) at 500℃ had the best performance. Among aged catalysts at 850℃ and 8 hours, Pt-La-Ni and Pt-Ni-Ce catalysts showed the highest C<sub>3</sub>H<sub>8</sub> conversion of about 71% at 500℃.
저온 플라즈마-광촉매장치용 SIC 담체-촉매의 카본 산화특성
최병철(Byungchul Choi),강한용(Hanyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
PM oxidation behavior of some kinds of catalysts that were coated on the SiC substrate were investigated for Non-Thermal Plasma Discharge- Photocatalyst(NTPDP) system. The catalyst samples were prepared with double layer coating method that consisted of the P25(photocatalyst, bottom layer) and metal additives(upper layer). Carbon(Printex-U) as diesel soot was coated on the SIC honeycomb monolith with catalyst. P catalyst was observed better behavior to complete carbon oxidation in non application of the NTPDP system, and Ni catalyst was better at partial oxidation at same condition. Ni catalyst had some advantageous that carbon oxidation effectively oxidized at 250℃ and NOx reduction was reached about 15~20% at 370℃ in application of the NTPD. Moreover Ni catalyst provides stable operation of the NTPDP system. The SIC substrate has a good thermal durability that it can endures an arc discharge during transient plasma discharge.
최병철(Byungchul Choi),김길남(Gilnam Kim),정석호(Sukho Chung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Characteristics of laminar lifted flames for highly diluted propane with nitrogen have been investigated in various co-flow temperatures up to 1000 K, including the behaviors of liftoff height and liftoff velocity. When the co-flow temperature was above 940 K, the flame was auto-ignited at a certain height above fuel nozzle tip, which exhibited unique characteristics as compared to the laminar lifted flames for T?≤900K. When the flame was auto-ignited, it is faint and colors weak blue such as mild combustion at high temperature. As increasing initial temperature in the autoignition range, the ignition delay time exponentially decreases and the propagation speed almost linearly increases. Consequently, based on the balance mechanism for the stabilization of laminar lifted flame, the jet velocity to make a lifted flame in the auto-ignition temperature range should be exponentially increased. By the way, the jet velocity range for the balance mechanism could be steadily decreased and finally disappeared by increasing initial temperature.
디젤자동차용 웜업촉매 내의 유동장에 미치는 터보차저 및 배플의 영향에 관한 수치해석
최병철(Byungchul Choi),정우남(Woo-Nam Juhng),위대웅(Daewoong Wi),강창혁(Changhyuk Kang),Liu Bao 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel vehicle is growing in importance in light-duty sector as a way of reducing greenhouse gases due to improved fuel economy. Carbon monoxide, gas-phase hydrocarbon and organic fraction of diesel particulates can be oxidized to harmless products using a diesel warm-up catalyst (WCC). This study investigated the effect of a turbocharger and a baffle on flow fields and temperature distributions in the WCC for Diesel vehicles by a numerical analysis. In the case of the WCC with the turbocharger, velocity vectors and temperatures of inlet of the WCC have the relatively homogeneous distributions by the swirl generated from the turbocharger. Velocity vectors and temperatures of inlet of the WCC with the turbocharger and the baffle have the improved distributions in homogeneity compared with the case of the WCC without the baffle. The homogeneous flow field and the temperature distribution in the WCC may contribute to improve the conversion performance of the catalysts.