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Shian Li,Qiuwan Shen,Bengt Sunden 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.2
In this present work, different supports (CeO2/ZrO2) and different Ni contents based catalysts were prepared by incipientwetness impregnation method and tested in the methane steam reforming (MSR) reaction. The prepared catalysts werecharacterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD analysis confirmed theprepared Ni/CeO2 samples have a pure crystal structure. In the catalytic tests, the effects of reactivity temperature, differentsupport, Ni loading content and the gas hourly space velocity (GHSV) on hydrogen production performance were investigatedsystematically. The results showed that the optimal reaction conditions for MSR by Ni/CeO2 catalyst were as follows: 10 wt% Ni/CeO2, 750 oC, 1500 h−1. The stability test for 12 h at 750 oC indicated that the chosen Ni/CeO2 catalyst had excellentthermal stability.
Shian Li,Zhiyu Yao,Facai Yang,Guogang Yang,Qiuwan Shen 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
Methane steam reforming (MSR) reaction is a promising industrial hydrogen production technology. Mg-Ni/CeO2 catalysts atdifferent Mg/Ni ratios of 6/4, 7/3, 8/2 and 9/1 with total loading of 10 wt% were used as catalysts for hydrogen production. The characterization techniques such as XRD, SEM and EDS were carried out on fresh and spent samples. Results showedthat the optimum Mg addition content for Mg/Ni-CeO2 is 2%. The process optimization of reaction parameters wereconducted by evaluating the catalytic activity. The stability of optimal Mg-Ni/CeO2 catalyst at 700 oC is examined for 8 h onstreamreaction. It reveals that Mg/Ni-CeO2 still maintains a relatively high catalytic activity after 8 h stability test.
Sweet Olive Extract Attenuates Dextran Sulfate Sodium-Induced Colitis in Mice
Li-Shian Shi,Po-Chen Liu,Yu-Fang Tseng,Yu-Ling Chen,Yi-Ling Ye 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.12
Sweet olive (Osmanthus fragrans flowers) is used to treat dysentery and reduce phlegm and stasis in traditional Chinese medicine. Recently, we found that verbascoside, the major component in the sweet olive ethanolic extract (OFE), inhibited IL-8 secretion in human colorectal adenocarcinoma WiDr cells. However, evidence-based treatment of inflammatory bowel disease (IBD) with the extract is yet to be performed. To evaluate the therapeutic effect of OFE, we measured IL-8 suppression by OFE and verbascoside in a WiDr cell culture assay. In the IL-8 secretion assay, both OFE (100 μg/mL) and verbascoside (10 μM) significantly inhibited IL-8 production in WiDr cells. Furthermore, we designed cotreated (dextran sulfate sodium [DSS]+OFE-treated) and post-treated (DSS–OFE-treated) protocols to access the therapeutic effects of OFE in vivo. Mice treated with 500 mg/kg per day OFE exhibited significant improvement in IBD symptoms, including disease activity index score, body weight, and colon length maintenance. The suppressive effects on myeloperoxidase expression and lower histopathology scores (including neutrophil infiltration) for the colon were also found. These findings suggest that OFE exerts anti-inflammatory effect on DSS-induced colitis.
Shian Li,Rongqiang Wei,Yuhang Jiang,Qiuwan Shen,Guogang Yang,Naibao Huang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.1
Oxy-fuel combustion is one of the proposed technologies which have the potential to achieve a zero CO2 emission. To enhancethe oxygen production performance of the oxygen carrier, different LaBO3-δ (B=Co, Ni, Fe, Cr) and metal oxide (CeO2, Al2O3,ZrO2) supported BaCoO3-δ perovskites have been successfully synthesized by the EDTA sol-gel method and further applied forproducing oxygen. The oxygen desorption/production performance of synthesized perovskites were studied in a fixed-bedreactor system. Furthermore, the effects of H2O and air as regeneration gas of metal oxide supported BaCoO3-δ perovskiteoxygen carrier were investigated in detail. Results shows that the oxygen desorption amount of different B-site substitutedLaBO3-δ (B=Co, Ni, Fe, Cr) perovskites decrease in the order of LaNiO3-δ > LaCoO3-δ > LaCrO3-δ > LaFeO3-δ.While comparedwith pure BaCoO3-δ and different metal oxide supported BaCoO3-δ, CeO2 supported BaCoO3-δ features higher productionamount of oxygen. Multiple cycles demonstrated that BaCoO3/CeO2 displays higher stability and regeneration capacity, whichis the key factor to provide stable O2/CO2 gas stream for oxyfuel combustion application. In short, the novel BaCoO3/CeO2oxygen carrier developed in this work exhibits high oxygen desorption capacity and stability. In addition, it provides apromising potential for oxygen production in industrial application.
Xu Li,Shian Shen,Junlin Deng,Tian Li,Chun-Bang Ding 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
Antioxidant activities and functional propertiesof tea seed protein hydrolysates (TSPH) prepared usingalcalase with different (10, 20, 30 and 40%) values of thedegree of hydrolysis (DH) were investigated. The effect ofhydrolysis time on antioxidant activity was also investigated. As the hydrolysis time was extended, the DPPH radicalscavenging activity increased and finally reached a plateau,the copper chelating capacity decreased, and the superoxideradical scavenging and iron chelating activities increasedinitially, then subsequently slowed. The solubility, foamingproperties, and emulsification properties of TSPH wereaffected by pH and DH. As the DH value increased, theDPPH radical scavenging activity and the reducing powerincreased and the copper chelating capacity decreased. TSPH at 20 and 30% DH values exhibited higher superoxideradical scavenging and stronger iron chelating activitiesrespectively, than TSPH at other DH values. The DH valueof TSPH affected the antioxidant activity and functionalproperties.
Strong adsorption of arsenic species by amorphous zirconium oxide nanoparticles
Hang Cui,Shian Gao,Jian Ku Shang,Qi Li 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
A novel oxide adsorbent of amorphous zirconium oxide (am-ZrO2) nanoparticles was synthesized by a simple hydrothermal process for effective arsenic removal from aqueous environment. Due to their high specific surface area (327.1 m2/g), large mesopore volume (0.68 cm3/g), and the presence of high affinity surface hydroxyl groups, am-ZrO2 nanoparticles demonstrated exceptional adsorption performance on both As(III) (arsenite) and As(V) (arsenate) without pre-treatment at near neutral condition. At pH ~ 7,the adsorption kinetic is fast and the adsorption capacity is high (over 83 mg/g for As(III) and over 32.4 mg/g for As(V), respectively). Under low equilibrium arsenic concentrations (Ce at 0.01 mg/L, the maximum contaminant level (MCL) for arsenic in drinking water), the amount of arsenic adsorbed by am-ZrO2 nanoparticles is over 0.92 mg/g for As(III) and over 5.2 mg/g for As(V), respectively. The adsorption mechanism of arsenic species onto am-ZrO2 nanoparticles was found to follow the inner-sphere complex mechanism. Testing with arsenic contaminated natural lake water confirmed the effectiveness of these am-ZrO2 nanoparticles in removing arsenic from natural water. The immobilized am-ZrO2 nanoparticles on glass fiber cloth demonstrated an even better arsenic removal performance than dispersed am-ZrO2nanoparticles in water, paving the way for their potential applications in water treatment facility to treat arsenic contaminated water body without pre-treatment. 2012 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Jian-Zhe Huang,Li-Hung Lin,Chin-An Chang,Chi-Te Liang,Kuang Yao Chen,Kui-Ming Chen,N. C. Chen,P. H. Chang,Shiou-Shian Han,Zhi-Hao Sun 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
We report on experimental studies of an Al$_{0.15}$Ga$_{0.85}$N/GaN high-electron-mobility transistor structure grown on a $p$-type Si (111) substrate. This structure is compatible with complementary metal-oxide-semiconductor (CMOS) technology and, thus, has great potential device applications. The low-temperature magnetoresistivity shows a parabolic dependence on the applied perpendicular magnetic field. This effect is ascribed to electron-electron interaction (EEI) effects in a weakly-disordered two-dimensional system. Our experimental results agree with the EEI theory when the correction term in the ballistic region has been subtracted.
Yang Guogang,Liao Jiadong,Shen Qiuwan,Li Shian,Jiang Ziheng,Wang Hao,Li Zheng,Zhang Guoling,Huang Naibao 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Droplet purging in the gas diffusion layer (GDL) is the key to improving the performance of proton exchange membrane fuel cells (PEMFCs). Lattice Boltzmann method (LBM) is used to study the dynamic behavior of multiple droplets randomly distributed in the GDL under air purging. The GDL is randomly reconstructed. The effects of rib width, initial water content, contact angle and air velocity are studied. By analyzing the dynamic distribution of droplets in the GDL and the change of the remaining water content with time, it is found that the droplets are only a small amount under the rib and accumulated mostly on both sides of the GDL at stabilization, which is caused by the large velocity under the rib. The residual water content in the GDL increases with the increase of the initial water content, and decreases with the increase of the rib width, contact angle and air velocity. However, when the rib to channel width ratio exceeds 1, the improvement of purging effect is not obvious, the purging time increases significantly, and the increase of air velocity does not help much to remove the droplets accumulated on both sides of the GDL.
Yang Guogang,Wang Hao,Su Fengmin,Li Shian,Zhang Guoling,Sun Juncai,Shen Qiuwan,Jiang Ziheng,Liao Jiadong,Chen Pengyu 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Proton exchange nembrane fuel cells (PEMFCs) are highly promising energy devices for future transportation and distributed power stations. The electrochemical performance of PEMFCs assembled with gas diffusion layer (GDL) of different porosity gradient distributions has been analyzed using the lattice Boltzmann method. A single-phase multi-component lattice Boltzmann model employing the active approach was developed to investigate the reactive gas flow within the GDL. Two types of GDLs with the same porosity, namely multilayer porosity gradient GDLs and linear porosity gradient GDLs, were generated to investigate the effect of the porosity gradient of the GDL on the electrochemical performance of PEMFC. The results show that the two types of porosity gradient GDL improve oxygen starvation problems and enhance water management, and that the GDLs with smaller porosity gradients can increase the mean current density. This paper develops the study of pore-scale analysis of PEMFC performance and can provide guidance for the design of GDL structures.