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NH3 에 의한 선택적 촉매환원반응에서 V2O5/TiO2 촉매의 격자산소 거동에 관한 연구
문승현,이호택,이현구 ( Seung Hyun Moon,Ho Taek Lee,Hyun Ku Rhee ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.6
Selective catalytic reduction(SCR) of nitric oxides using NH₃ has been recognized as one of the most effective denitrification processes to reduce NO_x from stationary sources. In this study, detachment and replenishment of lattice oxygen of V₂O_5/TiO₂ catalyst was investigated. In the flow of NH₃/N₂ without gaseous oxygen, NH₃reacted with the lattice oxygen to produce NO over V₂O_5/TiO₂ catalyst containing more than 3 wt% V₂O_5 whereas V₂O_5/TiO₂ catalyst containing less than 3 wt% V₂O_5 showed insignificant NO production. This indicates that lattice oxygen detaches from V₂O_5/TiO₂ catalysts having more than a certain amount of V₂O_5. Lattice oxygen-detached catalysts were regenerated by gaseous oxygen. Lattice oxygen of V₂O_5 impregnated on V₂TiO₂ was easily regenerated regardless of the temperature, but in the bulk V₂O_5, increasing the regeneration temperature leads to an increase in the degree of regeneration. From the results of TGA analysis conducted in a flow of oxygen, NH₃ pre-treated V₂O_5/TiO₂ catalyst containing more than a certain amount of V₂O_5 showed an increase of the catalyst weight as well as an increase in the H₂O concentration. This observation may be considered to support the reaction paths for detachment and replenishment of lattice oxygen proposed by Bosch et al.[1].
문승현,양정훈,연경호,Moon Seung-Hyeon,Yang Jung-Hoon,Yeon Kyeong-Ho The Membrane Society of Korea 2005 멤브레인 Vol.15 No.2
전기투석 공정에서 이온교환막 표면에 형성되는 스케일 영향을 조사하기 위해 장기간 동안 운전되었다. 탈염공정 동안, $Ca^{2+}$과 $SO_4^{2-}$ 이온의 농도는 농축실에서 연속적으로 증가하였으며 양이온교환막(Neosepta CMX)표면에 침전이 발생하였다. 초기 스케일 형성동안, 공정성능과 막 특성의 변화는 농축실 염농도 증가에 기인하여 일어나는 양이온교환막의 하계전류밀도가 감소하는 것을 제외하곤 미미하였다. 공정운전이 진행됨에 따라 양이온교환막의 한계전류밀도는 물의 해리 현상이 진행되어 $300\;A/m^2$까지 감소하였다. 막 오염은 농축실에서 양이온교환막 표면에 형성된 스케일과 물의 해리현상에 의해 유발된다는 결론을 얻었으며, 이러한 스케일 형성은 $CaSO_4$의 용해도에 의해 예측 가능한 것을 알 수 있었다. An electrodialysis process was operated for a long period to investigate the scale formation on the membrane surface. During the desalination process, concentration of $Ca^{2+}$ and $SO_4^{2-}$ ions increased continuously in the concentrate compartment and eventually caused precipitation on the cation exchange membrane (Neosepta CMX) surface. During the initial scale formation, the performance of the process and membrane characteristics did not show significant changes, except the decrease in limiting current density of the CMX membrane occurring due to increase in the salt concentration in the concentrate compartment. Eventually, the limiting current density of the fouled CMX membrane dropped significantly to $300\;A/m^2$ as water dissociation occurred in the CMX membrane. It was concluded that the fouling was caused mainly by the scale formation on the cation exchange membrane surface in the concentrate and consequent water dissociation. Also the scale formation was reasonably predicted by the solubility of $CaSO_4$.
조직구성원들의 개인주의-집단주의가 심리적 안녕에 미치는 영향: 개인-조직, 개인-직무 적합성의 조절효과
문승현 ( Seunghyun Moon ),조윤형 ( Yoonhyung Cho ) 한국생산성학회 2018 生産性論集 Vol.32 No.4
The psychological well-being(PWB: Ryff, 1989) is important theory because of contribute to an individual's enhancing the positive affect, contentment, and happiness. The study of psychological well-being has been guided by two primary conceptions of positive functioning. First, Bradburn's (1969) seminal work, distinguished between positive and negative affect and defined happiness as the balance between the two. Second, primary conception, which has gained prominence among sociologists, emphasizes life satisfaction as the key indicator of well-being. The convergence of these multiple frameworks of positive functioning served as the theoretical foundation to generate a multidimensional model of well-being(Ryff, 1989, 1995) so that PWB consist of 6 dimensions are self-acceptance, positive relationships with other people, autonomy, environmental mastery, purpose in life, and personal growth which is attained by achieving a state of balance affected by both challenging and rewarding life events. The aim of this research was to investigate the effects of individualistic value orientation (IVO), collectivistic value orientation(CVO) on the employees’ PWB. Also we test the moderating effects of person-job fit(PJF), person-organization fit(POF) between those of relationship. IVO-CVO are one of the cultural value orientations should be conceptualized as residing within a culture whether the focus is exclusively on representations of the self more specially broader values and belief systems. We draw the these IVO-CVO are critical determinants of PWB which dispositional approach such as trait activation theory and reflected context of person-environment fit as interaction between IVO-CVO and environment(organization, job). PJF defined the relationship between a person’s characteristics and those of the job or tasks that are performed at work and POF, which addresses the compatibility between people and entire organizations. Based on literatures, we proposed direct, and moderating effect hypothesis. To test hypothesis, total of 312 questionnaires, multi souce which self-report and supervision report, were used for analysis. The results are as follows. First, CVO have significantly positive impact on PWB, but IVO does not. Second, PJF have significantly positive impact on PWB, but POF does not. Third POF have moderate relationship between IVO, CVO and PWB. Base on the results, this study CVO and PJF is critical determinant of PWB that Individuals with strong CVO and match the requirement of job are likely to engage in psychological states that are beneficial to the their happy working life. Both of strong IVO, CVO employee amplify PWB that organization should more pay attents to their goal, value to matching the employees.
노후주택의 리트로핏을 위한 외벽 단열성능 측정방법 비교
문승현(Moon, Seoung Hyun),정웅준(Chung, Woong June),여명석(Yeo, Myoung Souk) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
Since each old house has different insulation performance, it is necessary to accurately measure the insulation performance for an efficient retrofit. In most of the studies, the insulation performance measurement method that is judged to be suitable for the field is the Heat Flow Meter method (ISO 9869) and the Infrared camera method (KS 2829). Both methods are accurate under certain conditions. However, since the environment of the old housing can not be manipulated, errors are inevitable. The purpose of this study is to grasp the errors of each method of measuring the insulation performance that can occur on the site, and to find out which insulation performance measurement method is more suitable for the old housing. As a result, the error of the HFM method (17%) was lager than that of the IR method (4%).
문승현(Seung Hyun Moon),이승재(Seung Jae Lee),유인수(In Soo Ryu) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.10
폐 목재 소각 보일러 배가스로부터 질소산화물을 저감하기 위하여 설치된 선택적촉매환원 공정의 시운전 중에 전단에 설치된 여과포의 일부 소실이 발생되었다. 여과포 소실에 따른 불완전 연소 가스는 2단으로 설치된 저온 탈질촉매 표면을 미연탄소로 침적시켜 촉매의 탈질 효율을 급격히 저감시켰다. 활성 저하의 원인 분석을 위하여 XRD, EDX, BET, TGA, SEM 등 다양한 특성 분석을 실시하였다. 재생 방법으로 산 세척, 초음파 수 세척, 공기 중 소성의 방법을 적용한 결과, 공기분위기에서 450℃로 2시간 소성하는 것이 최적조건 임을 밝혀내었다. 재생된 촉매는 2 cm × 2 cm × 10 cm(촉매 무게 10 g) Honeycomb 촉매 시료를 이용하여 활성을 측정한 결과 사용 전 촉매와 동일한 수준의 활성인 180℃에서 NOx저감 효율 100%를 나타내었다. A bag filter system was partially burnt down during a trial run of waste wood incineration boiler. This brought about unburned hydrocarbon which caused a rapid deactivation of low temperature SCR catalyst set up in two stage after the bag filter. The deactivated catalyst was investigated in order to trace the origin by several characterization methods such as XRD, EDX, BET, TGA, SEM. The deactivated catalyst was regenerated by different methods such as acid washing, water washing in ultrasonication, and calcination treatment under air condition. It is found the calcination treatment under air condition at 450℃ for 2 hours to be the best regeneration method. The catalytic activity was measured in the form of 2 cm × 2 cm × 10 cm (catalyst weight 10 g) honeycomb type. A deNOx efficiency of the regenerated catalyst showed 100% at 180℃ which is the same level of fresh one.