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RISS 인기검색어
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- 저자 : Jiandong Ye (검색결과 3 건)
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Catalytic oxidation of benzene over alumina-supported Cu-Mn-Ce mixed oxide catalysts
Yang Gao,Jun Xiao,Jiandong Ye,Xiaodong Huo,Yutong Shen 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1
Based on the response surface methodology (RSM), Cu-Mn-Ce catalysts were prepared via the vacuum impregnation method. Also, Their performance in the oxidation of a tar model compound (Benzene, 5,000 ppm) was evaluated. Results show that the optimum condition is CuO-MnO content of 30% and CeO2 content of 4.4% at a calcination temperature of 620 oC for 4.1 h. In this condition, the confirmatory experiment indicates the average carbon conversion rate within half an hour (Xc-0.5h) and four hours (Xc-4h) are 99.5% and 97.1% at 300 oC, respectively, which is in good agreement with the model prediction. XRD, H2-TPR, SEM, and XPS were employed in catalyst characterization. CuO is the primary active metal in the catalysts, which is affected easily by the calcination temperature. A lower calcination temperature tends to cause a weak structure strength, but a higher temperature results in impairing the reducibility. The major roles of CeO2 are displayed in two aspects that CeO2 increases the dispersion of the active metal, enhances the catalyst stability, and increases the oxygen vacancies and improves the oxygen transfer ability. For Cu-Mn-Ce composite catalyst, the catalytic oxidization of benzene complies with the Mars-van Krevelen mechanism (MVK). The content of CuO-MnO determines the number of active sites on the catalyst, which promotes the reduction of catalyst. CeO2 plays an important role in enhancing the oxidization of the catalyst. Therefore, the ratio of CuOMnO to CeO2 in the catalyst will cause a change of the control step of the redox reaction.
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High‑speed growth of high‑quality polycrystalline diamond films by MPCVD
Kai Chen,Tao Tao,Wenxiao Hu,Yucong Ye,Kaiwen Zheng,Jiandong Ye,Ting Zhi,Xiwei Wang,Bin Liu,Rong Zhang 한국탄소학회 2023 Carbon Letters Vol.33 No.7
High-quality diamond films have attracted extensive attentions due to their excellent optical and electrical properties. However, several issues, such as random orientation, stress accumulation, and slow growth rate, severely limit its applications. In this paper, high-quality polycrystalline diamond films with highly ordered (100) orientation were prepared by microwave plasma chemical vapor deposition. The effects of growth parameters on the microstructure, quality and residual stress of diamond films were investigated. Experimental results indicate that relatively high temperature at low methane concentration will promote the formation of (100) oriented grains with a low compressive stress. Optimized growth parameters, a methane concentration of 2% along with a pressure of 250 Torr and temperature at 1050 ℃, were used to acquire high growth rate of 7.9 μm/h and narrow full width at half maximum of Raman peak of 5.5 cm? 1 revealing a high crystal quality. It demonstrates a promising method for rapid growth of high-quality polycrystalline diamond films with (100) orientation, which is vital for improving the diamond related applications at low cost.
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Inkjet Printed Quantum Dots Color Conversion Layers for Full-color Micro-LED Displays
Feng Qin,Cao Liu,Wenhui Wu,Wenxiang Peng,Sitao Huo,Jiandong Ye,Shulin Gu 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
With the ever-growing demands for larger size and high resolution displays, Micro-light-emitting diode (Micro-LED) displaywith quantum dots (QDs) fi lm as color conversion layers (CCLs) has become one of the most promising candidates offuture display for its advantages in low power consumption and wide color range. In this study, we report a novel full-colordisplay based on blue Micro LED, which has patterned red and green QDs color conversion (QDCC) layers fabricated byinkjet printing (IJP). A structure of double-layer bank was designed to reduce color deviation, prevent crosstalk, and fl attenthe QDCC layer. By optimizing the thickness of the red/green QDCC layers and the wavelength of blue Micro LEDbacklights, a full-color QDCC-LED display with 228 PPI resolution and size of 1.11-inch was successfully fabricated andshowed superb performance. We not only eff ectively reduced crosstalk, but also improved the color conversion effi ciency ofQDs. In addition, this QDCC-LED display prepared by embedded bonding process shows a color gamut of 107.53% NTSC.
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