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V₂O_5/TiO₂ 촉매의 Ball Milling에 따른 산소 거동 특성 연구
권동욱,박광희,박광희,이상문,장두훈,홍성창 한국공업화학회 2011 공업화학 Vol.22 No.6
Ball milling을 이용하여 제조한 NH3-SCR용 V₂O_5/TiO₂촉매의 산소 거동 특성을 연구하였다. Ball milling으로 인한 촉매TiO₂의 결정구조, 비표면적 변화는 없지만 H₂-TPR분석에서는 최대 환원온도가 저온으로 이동한다. 산소농도를 달리한반응성 실험에서 모든 촉매는 산소가 없을 때 매우 낮은 NOx 전환율을 보이고, 산소 농도에 따라 BMC (Ball Milling Catalyst)의 활성이 더 우수한 경향을 나타낸다. 이는 격자산소와 기상산소의 반응참여 정도가 NMC (No Milling Catalyst) 보다 더 크기 때문이다.
권동욱,홍성창,김동호,김종식,하헌필 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The effects of sulfation of V/Sb/Ce/Ti catalyst on the SCR activity was examined. Sulfation treatment was carried out at 250, 300, 400, and 500 °C for 1 h. As sulfate species (SO<sub>4</sub><sup>2-</sup>) formed, the NH<sub>3</sub> adsorption capacity on the surface of catalyst increased. It reacted with NO to be converted into H<sub>2</sub>O and N<sub>2</sub>. In addition, as NO<sub>2</sub> was formed by the reaction of NO and O<sub>2</sub> in the sulfated catalyst, fast SCR reaction occurred. Increase in the surface Ce<sup>3+</sup> ratio of the sulfated catalyst increased the NO to NO<sub>2</sub> oxidation. The excellent SCR activity can be attributed to an enhancement in active oxygen species and chemisorption of NH<sub>3</sub>. When considering the SCR activity for V/Sb/Ce/Ti catalyst, the optimal conditions for sulfation were 500 °C.
권동욱,김동호,이석현,김종식,하헌필 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Various metals (W, Mo, and La) were added to the Ce/Ti to improve the performance of selective catalytic reduction (SCR) with NH<sub>3</sub>. The correlation between the physicochemical properties of Ce/Me/Ti catalysts and their catalytic activity were investigated. Among them, tungsten-doped Ce/Ti catalyst showed the most enhanced activity. Different Ce<sup>3+</sup> fractions were observed for Ce/Me/Ti catalysts. As the catalytic activity increased at low temperatures, the Ce<sup>3+</sup> fraction was higher. Brønsted acid sites of Ce/W/Ti appeared to be more abundant than Ce/Ti due to thd addition of tungsten. Furthermore, Ce/W/Ti catalyst exhibited an enhanced resistance to SO<sub>2</sub>-induced deactivation relative to Ce/Ti. Thus, the Ce/W/Ti catalyst, which is non-vanadiumbased catalyst, exhibits improved SCR activity due to addition of tungsten.
V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> 촉매의 Ball Milling에 따른 산소 거동 특성 연구
권동욱,박광희,이상문,장두훈,홍성창,Kwon, Dong Wook,Park, Kwang Hee,Lee, Sang Moon,Jang, Du Hun,Hong, Sung Chang 한국공업화학회 2011 공업화학 Vol.22 No.6
Ball milling을 이용하여 제조한 $NH_3-SCR$용 $V_2O_5/TiO_2$ 촉매의 산소 거동 특성을 연구하였다. Ball milling으로 인한 촉매 $TiO_2$의 결정구조, 비표면적 변화는 없지만 $H_2-TPR$분석에서는 최대 환원온도가 저온으로 이동한다. 산소농도를 달리한 반응성 실험에서 모든 촉매는 산소가 없을 때 매우 낮은 NOx 전환율을 보이고, 산소 농도에 따라 BMC (Ball Milling Catalyst)의 활성이 더 우수한 경향을 나타낸다. 이는 격자산소와 기상산소의 반응참여 정도가 NMC (No Milling Catalyst) 보다 더 크기 때문이다. We study on the oxygen behavior of $V_2O_5/TiO_2$ catalysts in the $NH_3$-selective catalytic reduction (SCR) prepared by the ball milling processing. There are not any changes in crystal structure and surface area of the $TiO_2$ catalyst by ball milling, but the maximal reduction temperature decreased in $H_2$-temperature programmed reduction (TPR) analysis. Experimental observations with various concentrations of oxygen indicate that all catalysts showed a very low NOx conversion rate in the absence of oxygen and the reactivity of ball milled catalyst higher depending on the oxygen. It is occurred because the degree of participation of atmospheric oxygen and lattice oxygen is great than that of the not-milled catalyst.
인공지능 학습을 통한 제한된 센서 융합기반의 헤딩각 추정을 이용한 차량의 후진 자율 주행의 정확도 개선
권동욱,김정구,정슬 제어·로봇·시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.6
This paper aims to improve the performance of the BDAS (Backward Driving Assist System) using a sensor fusion technique. The existing BDAS has a 1-m positional deviated error, which is based on the estimation of the vehicle’s heading and path from the steering angle sensor. To reduce the deviated error to less than 0.5 m, the use of rear-wheel sensors is proposed to estimate the heading angle through sensor fusion. After characterizing the steering-angle sensor, rear-wheel sensor, and yaw-rate sensor, data from different road conditions are collected. These data are learned by a neural network to generate appropriate heading angles. As a result of experiments conducted using an actual car, the backward driving error is reduced by half, within 0.5 m. .
중온 배기열을 이용한 유기랭킨사이클 작동유체별 성능특성
권동욱,허기무,윤성훈,문윤재,유호선,이재헌,Kwon, Dong-Uk,Heo, Ki-Moo,Yoon, Sung-Hoon,Moon, Yoon-Jae,Yoo, Ho-Sun,Lee, Jae-Heon 한국플랜트학회 2014 플랜트 저널 Vol.10 No.2
2012년부터 신재생에너지 의무공급제도가 국내에 도입되고, 전 세계적인 에너지 절약과 환경보존 측면에서 미활용 및 신재생에너지원에 대한 관심이 날로 증가하고 있다. 특히, 중저온 열원의 활용방안에 대하여 많은 관심과 연구가 활발하게 진행되면서 고부가가치의 전력생산이 가능한 유기랭킨사이클이 그 대안으로 떠오르고 있다. 따라서 본 연구에서는 유기랭킨사이클 발전시스템을 하수 처리장 1,500 kW 바이오가스엔진 배기열을 열원으로 하부 사이클을 구성하여 성능해석 상용 프로그램으로 성능특성을 예측하였다. 바이오가스엔진 배열의 실제 운전조건은 $460^{\circ}C$의 온도와 매 초당 2.7 kg의 유량으로 운전되고 있었다. 이러한 열원 온도에 적합한 작동유체를 다수 선정하여 작동유체 종류별 성능해석을 수행하였으며, 최고의 성능이 나타나는 이소펜탄의 경우 163.1 kW의 발전출력과 13.66%의 효율을 얻을 수 있었다. Renewable Portfolio Standards was introduced into the system in Korea in 2012. Interest in the unutilized and renewable energy sources is increasing. and these being actively investigated. An organic rankine cycle has emerged as an alternative in order to take advantage of bio-gas engine heat of sewage treatment plants whose capacity is 1500 kW. The organic rankine cycle power system was simulated by a simulator which is a commercial program of power plant design and performance analysis. The biogas engine is operated by $460^{\circ}C$ and 2.7 kg/s flow rate in the sewage treatment plant. Working fluids(R-601a, R-123, R-245fa) are selected to use in ORC power system in this temperature range. It was the isopentane that is the best performance among three working fluids. It could be obtained net power of 163.1 kW and efficiency of 13.66% from isopentane in the simulation.