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Priscilla, Lia,Kong, Yongjin,Yoo, Jiho,Choi, Hokyung,Rhim, Youngjoon,Lim, Jeonghwan,Kim, Sangdo,Chun, Donghyuk,Lee, Sihyun,Rhee, Youngwoo American Chemical Society 2017 ENERGY AND FUELS Vol.31 No.10
<P>Utilization of coal is currently limited to coal-fired power plants and iron smelting, partly because of the incombustible ash in coal and the inability of existing technologies to modify its properties. This work investigates whether the gasification behavior of ash-free coals (AFCs) can be modified. Sixteen different AFCs were prepared using variously ranked coals (Eco, Cyprus, Drayton, and Hail Creek) and extraction solvents with different polarities (N-methyl-2-pyrrolidone, ethylenediamine, 1-methylnaphthalene, and tetralin). Next, the reactivities of the AFCs in steam gasification at 800 degrees C were tested, and the results are discussed taking into consideration their compositional differences. A combination of low-rank coals and polar solvents produces reactive AFCs that can be catalytically gasified under mild conditions. In contrast, AFCs extracted using nonpolar solvents are less reactive and possibly applicable as a carbon electrode precursor. In short, the properties of AFCs can be changed to some extent using the appropriate combination of coals and extraction solvents.</P>
Catalytic Steam Reforming of Methanol Using Coal-supported Rhodium Catalyst for Hydrogen Production
Priscilla Lia,Chun Dong Hyuk(전동혁),Choi Ho Kyung(최호경),Kim Sang Do(김상도),Lim Jeong Hwan(임정환),Rhim Young Joon(임영준),Lee Si Hyun(이시훈),Rhee Young Woo(이영우),Yoo Ji Ho(유지호) 한국에너지기후변화학회 2016 한국에너지기후변화학회 학술대회 Vol.2016 No.11
Nickel Catalysts Supported on Ash-Free Coal for Steam Reforming of Toluene
Lia Priscilla,김수현,유지호,최호경,임영준,임정환,김상도,전동혁,이시훈 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.6
Catalytic supports made of carbon have many advantages, such as high coking resistance, tailorable pore and surface structures, and ease of recycling of waste catalysts. Moreover, they do not require pre-reduction. In this study, ash-free coal (AFC) was obtained by the thermal extraction of carbonaceous components from raw coal and its performance as a carbon catalytic support was compared with that of well-known activated carbon (AC). Nickel was dispersed on the carbon supports and the resulting catalysts were applied to the steam reforming of toluene (SRT), a model compound of biomass tar. Interestingly, nickel catalysts dispersed on AFC, which has a very small surface area (~0.13 m2/g), showed higher activity than those dispersed on AC, which has a large surface area (1,173 m2/g). X-ray diffraction (XRD) analysis showed that the particle size of nickel deposited on AFC was smaller than that deposited on AC, with the average values on AFC ≈11 nm and on AC ≈23 nm. This proved that heteroatomic functional groups in AFC, such as carboxyls, can provide ion-exchange or adsorption sites for the nano-scale dispersion of nickel. In addition, the pore structure, surface morphology, chemical composition, and chemical state of the prepared catalysts were analyzed using Brunauer-Emmett-Taylor (BET) analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM), x-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, and temperature- programmed reduction (TPR).
Polydioxanone(PDO) dermal filler and its collagen regenerating effect in skin layer
이청천,( Lia Priscilla ),곽민석,전효선,심용호,권한진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
As rapid growth of interest in beauty, market of cosmetic dermal filler is emerging in the world. Since the first cross-linked hyaluronic acid (HA) dermal filler was approved in FDA, it occupied major part of this market up to this day. However, the HA filler has a limit because of its toxicity due to 1,4-Butanediol diglycidyl ether (BDDE) cross linker. So, the FDA strictly regulated the amount of BDDE usage. This concern leads to interest in biodegradable polymer as the dermal filler. We processed biodegradable PDO micro particle and confirmed its effect as dermal filler application. In order to confirm the in-vivo volume enhancing effect of the PDO filler, it was injected into back skin layer of mouse, and its retention time of enhanced volume was detected. Furthermore, we confirmed collagen regeneration around the injected PDO particle in skin layer. Our PDO filler is currently ongoing clinical trial to confirm its safety and is expected to be approved in KFDA next year.