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백영순,윤경호,김형진 ( Y . S . Baek,K . H . Yoon,H . J . Kim ) 한국공업화학회 1995 공업화학 Vol.6 No.5
알루미나에 귀금속(Pd, Pt)을 담지한 촉매를 제조하여 Pellet상에서의 메탄 연소특성 실험을 수행하였다. 본 연구에서는 촉매 연소기 운전에 관련된 여러 변수들인 귀금속 담지량, 가스의 공간속도, 그리고 가스의 공연비를 선정하여 이들이 연소 반응에 미치는 영향을 연구하였다. 촉매의 귀금속 담지량이 증가 할수록 메탄 전화율은 증가하나 1.0wt% 이상에서는 전화율의 증가가 높지 않았음이 측정되었다. 귀금속 1wt%로 담지한 촉매와 700℃ 이상의 연소온도 조건하에서 90%의 메탄전화율을 얻기 위해서는 가스의 공간속도가 Pd 금속의 경우 18,000/h 이하, Pt의 경우는 10,000/h 이하에서만 가능함을 알 수 있었다. Alumina-supported noble metal (Pt or Pd) catalysts were prepared. The alumina-supported catalysts in the shape of pellet were tested in terms of methane combustion. The palladium supported on alumina showed higher activity as compared to the platinium supported on alumina. Behaviors of the catalysts in methane combustion were investigated as functions of noble metal content, space velocity and air-fuel ratio. It was observed that the methane conversion rate was increased with the metal weight increased up to 3.0wt%, but the slope of the increasing rate of conversion was slowed down rapidly after 1.0wt%. It was also found that 90% of methane conversion with the catalysts having 1wt% metal content at the combustion temperature of above 700℃ was only possible when the space velocities were less than 18,000/hr for the Pd catalyst and 10,000/hr for the Pt catalyst, respectively.
졸 - 겔법에 의한 헥사알루미네이트의 제조 및 연소특성
백영순,박성욱,김형진,문세기 ( Y . S . Baek,S . W . Park,H . J . Kim,S . K . Moon ) 한국공업화학회 1995 공업화학 Vol.6 No.6
금속 알콕사이드법에 의해 복합 알콕사이드를 합성하고, sol-gel 법으로 가수분해 반응시켜 얻은 전구체를 소성하여 내열성 바륨 헥사알루미네이트 담체를 만들었다. 복합 알콕사이드 합성시 알코올의 종류 및 양, 반응시간을 변화시켜 barium hexaaluminate 전구체물성에 미치는 영향을 관찰하였으며, 이 담체에 활성 물질인 전이금속(Mn, La)을 치환시켜 BaMnAl_(11)O_(19)과 Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매를 만들었다. 담체의 비표면적은 소성온도 1300℃에서 약 24㎡/g의 높은 값을 나타냈으며, 메탄 연소에 대한 활성화 에너지는 BaMnAl_(11)O_(19) 촉매의 경우 약 11㎉/mole, Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매의 경우 약 9㎉/mole을 나타냈다. 이를 사용하여 중·고온용 연소기의 운전범위에서 공간속도와 공연비를 변화시키면서 메탄 연소특성을 수행하였다. Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to make the precursors using sol-gel method. Factors such as kinds and amounts of alcohols and reaction time which govern the material properties of the barium hexaaluminate precursors were studied. The heat resistant barium hexaaluminate were prepared after the calcination of the precursors. BaMnAl_(11)O_(19) and Sr_(0.8)La_(0.2)MnAl_(11)O_(19) catalysts were finally yielded by the introduction of active transition metals (Mn, La) into the metals(Ba, Sr) hexaaluminate by substitution. The surface area of the hexaaluminate support was about 24㎡/g at 1300℃ and the activation energy for methane combustion was 11㎉/㏖ for BaMnAl_(11)O_(19) and 9㎉/㏖ for Sr_(0.8)La_(0.2)MnAl_(11)O_(19). Based on these catalysts, the characteristics of methane combustion were studied as functions of space velocity and air/fuel ratios in the operational range of mid/high temperature combustors.
장애를 가진 형제를 둔 비장애학생의 회복탄력성과 스트레스 및 스트레스 대처방식과의 관계
백영순,박순길 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.24
Objectives This study aimed to explore the resilience, stress, and stress coping strategies of non-disabled students who have siblings with disabilities. The study also investigated the differences based on gender and school grade, as well as the correlations between these variables. Methods A survey was conducted with 89 non-disabled students who have siblings with disabilities from 8 private developmental rehabilitation centers in Gwangju, Jeonnam, and Jeonbuk. Descriptive statistics, one-way ANOVA, and correlation analysis were used to analyze the data. Results First, there was no significant difference in resilience and stress coping strategies for non-disabled students with siblings with disabilities; however, stress levels were higher among female students compared to male students. Second, as school grade increased, resilience also increased, while stress coping strategies decreased. Third, resilience showed a negative correlation with stress and a positive correlation with stress coping strategies. Conclusions Based on these findings, it is suggested that support programs are needed to enhance the resilience and stress coping strategies of non-disabled students who have siblings with disabilities, and to improve the quality of life for both the disabled siblings and the non-disabled students.