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RISS 인기검색어
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- 저자 : 최태열 (검색결과 14 건)
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폐기물 유래 합성가스로부터 수소생산을 위한 고온수성가스전이 반응용 Co-CeO2촉매 활성에 ZrO2가 미치는 영향
In this study, highly active and stable CeO2, ZrO2, and Zr(1-x)Ce(x)O2-supported Co catalysts were prepared using the co-precipitation method for the high-temperature water gas shift reaction to produce hydrogen from waste-derived synthesis gas. The physicochemical properties of the catalysts were investigated by carrying out Brunauer-Emmet-Teller, X-ray diffraction, CO-chemisorption, Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and H2-temperature-programmed reduction measurements. With an increase in the ZrO2 content, the surface area and reducibility of the catalysts increased, while the interaction between Co and the support and the dispersion of Co deteriorated. The Co-Zr0.4Ce0.6O2 catalyst and the Co-Zr0.6Ce0.4O2 catalyst showed higher oxygen storage capacity than the others because of the distortion of the CeO2 structure due to the substitution of Ce4+ by Zr4+. The Co-Zr0.6Ce0.4O2 catalyst with high reducibility and oxygen storage capacity exhibited the best catalytic performance and stability among all the catalysts investigated in this study. 본 연구의 목적은 HTS 반응용 촉매인 Co-Zr(1-x)Ce(x)O2 촉매의 CeO2와 ZrO2의 비율을 최적화하는 것이다. 선행연구에 따르면, Co-ZrCeO2 촉매는 넓은 OSC (Oxygen Storage Capacity)와 우수한 산화환원 능력으로 인해 높은 활성을 나타내었다. 또한, ZrO2로 인해 열적안정성이 높아져 촉매의 안정성을 크게 향상시켰다. 그러나, CeO2와 ZrO2의 비율에 따른 촉매의 활성과 안정성 차이에 관한 연구는 진행되지 않았기 때문에 CeO2와 ZrO2의 비율을 최적화 하는 연구가 필요하다. CeO2와 ZrO2의 비율은 촉매의 성능과 안정성에 직접적인 영향을 끼친다. 따라서, 본 연구에서는 선행연구를 바탕으로 Co-Zr(1-x)Ce(x)O2 촉매를 공침법으로 제조하였으며, Co를 15 wt.%, ZrCeO2를 85 wt.%로 고정한 후, CeO2와 ZrO2의 몰비를 각각 10:0, 8:2, 6:4, 4:6, 2:8, 0:10으로 변화시켜 촉매를 제조하였다. 그 후, 제조된 촉매를 637,320 mL·g-1·h-1의 높은 기체공간속도(GHSV)에서 HTS반응에 대한 성능을 비교 검토하였으며, 450 °C에서 50시간 동안 안정성 테스트를 진행하였다. 또한, 촉매의 성능과 특성 간의 상관관계를 분석하기 위해 BET, XRD, H2-TPR, Co-Chemisorption, XPS, Raman 등의 물리화학적 특성분석을 진행하였다.
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최태열 경주대학교 산업경영대학원 2005 국내석사
A Study on the Utilization of Websites for the Promotion of Corporate Images Choi, Tae Yeul Department of Business Administration The Graduate School of Industry and Business Administration Gyeongju University (Supervised by Professor Jung, Ki-Eok) (Abstract) 1. Overview In the digital era, the corporate promotional activity can be highly effective when it is carried out via a website on the Internet. It is because Internet is an interactive communication media that gives benefits to both company and client since a company can offer information that enables the company to promote its good image to clients or information for marketing, and clients can make a purchase on the spot by acquiring necessary information. Currently, most companies promote themselves and offer information to clients by opening a website on the Internet. However, many of them fail to offer relevant information that clients need even if they have their own websites, or have much worry about how to manage their websites and organize contents. Then, how companies can utilize their websites to enhance corporate images? This study aims to seek out measures to utilize a corporate website as an effective means for enhancing a corporate image by researching what components and strategies are necessary for operating a corporate website for maximizing the effective enhancement of a corporate image by using a corporate website. 2. Study Methods I aimed to grope for ways to utilize a website for enhancing a corporate image through more effective and consistent message transfer by appointing one company that proceeds to such an activity on its website most effectively among domestic companies, and intensively analyzing the company. In this thesis, I appointed KT&G website as a case study, and conducted an analysis focused on contents and service type, their problems,, and usability of those services offered for enhancing a corporate image. As for main contents subject to my analysis, I conducted an analysis on the overview of KT&G website and an analysis by menu, and intensively analyzed four items including contents and usability, consistency of the website, interaction with clients through the website, and differentiated strategies unique to KT&G. 3. Conclusion As a result of analyzing websites, KT&G website was proven to be well utilized as a means for effectively enhancing a corporate image based on a full understanding on the features of Internet as a new media in the digital era. My suggestions on desirable directions and strategies for activities enhancing a corporate image via the Internet based on the case analysis result of KT&G website include the following. First, a website needs to facilitate the accessibility of users to information. Second, a website should offer new and necessary information to users all the time. Third, a website needs to enable a company to make a promotion on a corporate image as well as to directly mention its product(tobacco) on the website. 4. Meaning and Limitations This thesis is meaningful in that it offered a meaningful suggestive points to companies that aim to enhance corporate images by proposing directions of development from a perspective of the utilization of corporate website and through a case study on a company that actually operates its website for the elevation of corporate image. However, this study has limitations in that there appeared a limitation generally shown on a single case analysis and there was no positive analysis in this study.
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