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연료 개질 모델 가스를 이용한 Pt-based 촉매에서의 NOx 변환 특성에 관한 연구
임수철(Suchol Lim),이경택(Kyungtaek Lee),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This experiment was conducted by using Pt/Al₂O₃, Pt/SiO₂ and Pt/CeO₂ catalysts with C₃H?, H₂, CO and their mixtures in with and without H₂O conditions. When reductant condition was C₃H? 2400ppmC₁, Pt/Al₂O₃ and Pt/SiO₂ catalysts showed maximum NOx conversion efficiency 45% at 250℃ 53% at 250℃, 14% at 400℃ respectively without H₂O conditions, In H₂ 2400ppm condition, more than 200℃, NOx conversion efficiency was decreased in the order of Pt/SiO₂, Pt/CeO₂, Pt/Al₂O₃, on the other hand, Pt/CeO₂ catalyst showed maximum 35% NOx conversion in 250℃. In mixture of C₃H? 1200ppmC₁ and H₂ 1200ppm condition, in 200℃, Pt/Al₂O₃, Pt/SiO₂, Pt/CeO₂ showed maximum 45%, 53%, 15% NOx conversion respectively, Especially Pt/Al₂O₃ catalyst showed wide temperature range. Experiments was conducted in a several ratio between H₂ and CO. Conclusion is that addition of CO is generally deactivation factor in NOx conversion. Compare with and without H₂O condition in a ratio between H₂ and CO, inclusion of H₂O is deactivation factor in NOx conversion.
Robust PID Controller Design Using Convex-Concave Optimization
Chawalit Thabthimrattana,Surachai Saelim,Suchol Tiewcharoen,Sudchai Boonto 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
This paper shows a PI with phase-lead controller design using convex-concave optimization. The phase-lead term is added to reduce a high frequency measurement noise effect. By fixing all parameters of the phase-lead part, the optimization program searches the remain parameters subject to robustness constraints. The optimization constraints are functions in a frequency domain. The design problem can be solved by frequency gridding on a software package CVX. Experiments on an unstable magnetic levitation system are presented. The proposed controller shows significantly better performance than a robust H∞ controller designed by a standard method on the same unstable system.
Chung, Jinhwa,Lim, Suchol,Ha, Jongju,Song, Soonho,Chun, Kwangmin WILEY-VCH Verlag 2010 Chinese journal of chemistry Vol.28 No.7
<P>This study investigated the selective catalytic reduction (SCR) of nitrogen oxides (NO<SUB>x</SUB>) with hydrocarbon in the presence of excess oxygen using various composition ratios of Pt/Al<SUB>2</SUB>O<SUB>3</SUB>, Rh/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst mixtures. The composition ratios were 1:1, 1:2, 2:1, 1:3 and 3:1 of 1 wt% Pt/Al<SUB>2</SUB>O<SUB>3</SUB> and Rh/Al<SUB>2</SUB>O<SUB>3</SUB>, which are known to exhibit efficient NO<SUB>x</SUB> reduction at low and high temperatures among the noble metal catalysts. Experiments conducted on a single reductant revealed that more efficient NO<SUB>x</SUB> conversion could be obtained when Pt/Al<SUB>2</SUB>O<SUB>3</SUB> and Rh/Al<SUB>2</SUB>O<SUB>3</SUB> were mixed at a ratio of 3:1, rather than 1:1 or 1:3. In a single reductant condition, C<SUB>3</SUB>H<SUB>6</SUB> 800 ppm (2400 ppmC<SUB>1</SUB>) and 400 ppm (1200 ppmC<SUB>1</SUB>) exhibited 50% and 38% NO<SUB>x</SUB> conversion efficiency at 200°C, respectively. However, NO<SUB>x</SUB> conversion efficiency gradually decreased when temperatures were increased above 250°C. With regard to Pt/Al<SUB>2</SUB>O<SUB>3</SUB> and Rh/Al<SUB>2</SUB>O<SUB>3</SUB> ratio, higher ratios of Rh/Al<SUB>2</SUB>O<SUB>3</SUB> activated this Pt+Rh/Al<SUB>2</SUB>O<SUB>3 </SUB>catalyst in the high temperature range.</P> <B>Graphic Abstract</B> <P>This study investigated the selective catalytic reduction (SCR) of nitrogen oxides (NO<SUB>x</SUB>) with hydrocarbon in the presence of excess oxygen using various composition ratios of Pt/Al<SUB>2</SUB>O<SUB>3</SUB>, Rh/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst mixtures. The composition ratios were 1:1, 1:2, 2:1, 1:3, and 3:1 of 1 wt% Pt/Al<SUB>2</SUB>O<SUB>3</SUB> and Rh/Al<SUB>2</SUB>O<SUB>3</SUB>, which are known to exhibit efficient NO<SUB>x</SUB> reduction at low and high temperatures among the noble metal catalysts. <img src='wiley_img_2010/1001604X-2010-28-7-CJOC201090190-content.gif' alt='wiley_img_2010/1001604X-2010-28-7-CJOC201090190-content'> </P>