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정민혜,배종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A chemical looping (CL) process for an alternative route of oxidative dehydrogenation (CL-ODH) of ethane to ethylene by cyclic redox reaction using transition metal oxides was investigated to convert ethane into ethylene by reduction step and subsequently CO<sub>2</sub> activation to CO by oxidation step. The FeCeTiOx mixed-metal redox catalysts with different molar ratios of iron metal was applied for CL reaction. The FeCeTiOx catalyst with a molar ratio of Fe:Ce:Ti=0.150:0.075:1 showed 17.6% ethane conversion and 70.8% ethylene selectivity at the reduction step of 550 ℃. From the subsequent oxidation step at 700 ℃, CO was produced with 0.5mmol/gcat by CO<sub>2</sub> activation as well. The structural and surface properties of the redox FeCeTiOx catalysts were characterized by N<sub>2</sub> sorption, TGA, XRD, XPS and TPR analysis to verify the active sites for the CL reaction of ethane and CO<sub>2</sub>.
정민혜,배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
An alternative route of oxidative dehydrogenation of ethane (CL-ODH) by chemical looping process with transition mixed metal oxides was investigated by a cyclic redox reaction, which was designed to convert ethane into ethylene by reduction step on the mixed metal oxides and subsequent CO<sub>2</sub> activation to CO by oxidation step on the partially reduced metal oxides. A prototype Fe/TiO<sub>2</sub> with 5wt%Fe exhibited a higher ethane conversion of 9.7% and ethylene selectivity of 91% by showing a volcano-plot in terms of Fe content between 5~20wt%Fe. In addition, Ce-incorporated FeTiO<sub>x</sub> with 5wt%Fe showed a further enhanced ethane conversion for CL-ODH. The reducibility of the mixed metal oxides was clearly related with the catalytic performance by increasing the Fe<sup>2+</sup> content as well as oxygen vacant sites through a facile redox properties of mixed metal oxides.
정민혜,문지원,배종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The effects of Ce substitution into the iron-containing mixed metal oxides were investigated for ethane dehydrogenation to ethylene as well as CO<sub>2</sub> activation through two-step chemical looping oxidative dehydrogenation (CL-ODH) reaction. The CL-ODH has potential to overcome the drawbacks of steam cracking of ethane, which is the known process with a higher energy consumption, coke formation, and significant CO<sub>2</sub> and NOx emission. In the present study, the Ce substitution into the FeTiOx mixed metal oxides largely enhanced catalytic activity and stability. The promotional effects of Ce promoter were investigated through many surface characterization tools, and the results of H<sub>2</sub>-TPR and O<sub>2</sub>-TPD revealed that the Ce substitution on FeTiOx enhanced the redox ability through a facile oxygen transfer on the surfaces.
기술수용모델을 적용한 무용수의 온라인 플랫폼 수용의도에 관한 연구
정민혜,전순희 한국무용연구학회 2022 한국무용연구 Vol.40 No.4
연구목적: 본 연구는 기술수용모델(TAM)을 적용하여 무용수의 온라인 플랫폼 수용의도를 파악하는 데 있다. 연구방법: 서울 지역에 소재한 대학교의 무용 전공자 343 명을 표집하여 설문조사를 실시하였으며, 기술수용모델의 변수(인지된 유용성, 인지된 용이성)가 온라인 플랫폼 수용의도에 미칠 것이라고 예상되는 외부변수와의 관계를 분석하였다. 자료처리는 SPSS 20과 AMOS 18 통계 프로그램을 사용하여 빈도분석, 탐색적 요인분석, 신뢰도분석(Cronbach's Alpha), 상관관계분석, 확인적요인분석, 구조방정식모형(SEM)을 진행하였다. 결과: 외부변수 흥미성, 홍보성은 인지된 유용성과 인지된 용이성에 정(+)의 영향을 미치는 것으로 나타났지만, 인지된비용합리성은 인지된 유용성에 영향을 미치지 않았으며, 인지된 용이성에는 정(+)의영향을 미쳤다. 또한 인지된 용이성은 인지된 유용성에 정(+)의 영향을 주었으나, 인지된 유용성과 인지된 용이성은 지속이용의도에 영향을 미치지 않는 것으로 나타났다. 추가적인 분석결과 흥미성, 인지된 비용합리성, 홍보성이 지속이용의도에 정(+) 의 영향을 미치는 것으로 나타났다. 결론: 온라인 플랫폼 수용의도에 사용자가 인지하는 요인들에 대한 인과관계, 수용 요인의 구조적 모형을 규명, 기술에 대한 태도를 파악하였다.