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15 results on '"Jung, Jongwook"'

5. Oxychlorination of methane over FeOx/CeO2 catalysts

Author

Gyohyun Hwang, Bang Jungup, Bang Yongju, Jung Jongwook, YoungSeok Ryou, Jeongeun Kim, and Do Heui Kim

Subjects
Cerium oxide, 010405 organic chemistry, General Chemical Engineering, Chloromethane, Inorganic chemistry, Sintering, Oxychlorination, chemistry.chemical_element, General Chemistry, 010402 general chemistry, 01 natural sciences, Methane, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, chemistry, Selectivity, Carbon
Abstract

Methane activation through oxychlorination is in the spotlight due to the relatively mild reaction conditions at atmospheric pressure and in the temperature range of 450–550 °C. Although CO2 is known to exhibit good activity for methane oxychlorination, significant amounts of by-products such as CO2, CO and carbon deposits are produced during the reaction over CO2. We investigated the effect of iron in FeOx/CO2 catalysts on methane oxychlorination. FeOx/CO2 with 3 wt% iron shows the maximum yield at 510 °C with 23% conversion of methane and 65% selectivity of chloromethane. XRD and H2 TPR results indicate that iron-cerium solid solution was formed, resulting in the production of more easily reduced cerium oxide and the suppression of catalysts sintering during the reaction. Furthermore, the selectivity of by-products decreased more significantly over FeOx/CO2 than cerium oxide, which can be attributed to the facilitation of HCl oxidation arising from the enhanced reducibility of the former sample.

Published
2018

6. 22‐1: Invited Paper:Electrically Switchable Privacy Technology Suitable for Laptop PC

Author

Lee, Dong-Jin, Kwak, Jaeyoung, Ha, Kyung Su, Jung, Jongwook, Lee, Chan Heon, Kim, Gwang Tae, Youn, Won Gyun, and Park, Jeong-Ki

Abstract

This paper introduces an e‐Privacy display, electrically switchable between wide viewing angle (share) mode and narrow viewing angle (privacy) mode, operated by louver film and polymer dispersed liquid crystal (PDLC), named as viewing angle control film (VCF). Especially, focusing on e‐Privacy suitable for laptop PC, reducing power consumption and maximizing privacy feature can be achieved through PDLC haze customization by input voltage control and three layers (louver, PDLC, and panel) lamination to eliminate air gap. As a result, the VCF technology is optimized for e‐Privacy laptop PC which can be used in various environmental conditions.

Published
2022
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7. Oxychlorination of methane over FeOx/CeO2 catalysts.

Author

Kim, Jeongeun, Ryou, Youngseok, Hwang, Gyohyun, Bang, Jungup, Jung, Jongwook, Bang, Yongju, and Kim, Do Heui

Abstract

Methane activation through oxychlorination is in the spotlight due to the relatively mild reaction conditions at atmospheric pressure and in the temperature range of 450-550 °C. Although CO2 is known to exhibit good activity for methane oxychlorination, significant amounts of by-products such as CO2, CO and carbon deposits are produced during the reaction over CO2. We investigated the effect of iron in FeOx/CO2 catalysts on methane oxychlorination. FeOx/CO2 with 3 wt% iron shows the maximum yield at 510 °C with 23% conversion of methane and 65% selectivity of chloromethane. XRD and H2 TPR results indicate that iron-cerium solid solution was formed, resulting in the production of more easily reduced cerium oxide and the suppression of catalysts sintering during the reaction. Furthermore, the selectivity of by-products decreased more significantly over FeOx/CO2 than cerium oxide, which can be attributed to the facilitation of HCl oxidation arising from the enhanced reducibility of the former sample. [ABSTRACT FROM AUTHOR]

Published
2018
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9. Terahertz time-domain measurement of non-Drude conductivity in silver nanowire thin films for transparent electrode applications

Author

Kim, Jaeseok, primary, Maeng, Inhee, additional, Jung, Jongwook, additional, Song, Hyunjoon, additional, Son, Joo-Hiuk, additional, Kim, Kilsuk, additional, Lee, Jaeik, additional, Kim, Chul-Hong, additional, Chae, Geesung, additional, Jun, Myungchul, additional, Hwang, YongKee, additional, Jeong Lee, Su, additional, Myoung, Jae-Min, additional, and Choi, Hyunyong, additional

Published
2013
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10. Terahertz time-domain measurement of non-Drude conductivity in silver nanowire thin films

Author

Kim, Jaeseok, primary, Maeng, Inhee, additional, Jung, Jongwook, additional, Song, Hyunjoon, additional, Son, Joo-Hiuk, additional, Kim, Kilsuk, additional, Lee, Jaeik, additional, Kim, Chul-Hong, additional, Chae, Geesung, additional, Jun, Myungchul, additional, Hwang, YongKee, additional, Lee, Su Jeong, additional, Myoung, Jae-Min, additional, and Choi, Hyunyong, additional

Published
2013
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