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이찬민,나희수,전유권,황호정,김현종,Isao Mochida,윤성호,박주일,설용건 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-
Poly(ether imide) (PEI) membranes for polymer electrolyte membrane fuel cells (PEMFCs) are preparedby the electrospinning method. This approach produces a membrane with a high porosity and surfacearea that is suitable for accommodating proton-conducting materials. A composite membrane wasprepared by impregnating the pores of the electrospun PEI membrane with Aquivion ionomer. Then, aninorganic proton conductor in the form of SiO2/heteropolyacid (HPA) nanoparticles was prepared by amicroemulsion process and the particles added to the Aquivion ionomer. The membranes werecharacterized byfield emission scanning electron microscopy (FE-SEM) and single-cell performancetesting for PEMFC. The durability of the composite membrane was assessed via accelerated lifetime andon/off tests. The ionomer-impregnated electrospun PEI membrane showed good thermal stability, satisfactorymechanical properties, and high proton conductivity. The addition of the SiO2/HPA nanoparticlesimproved the proton conductivity of the composite membrane, thereby allowing the operatingtemperature in low humidity environments to be extended. The composite membrane exhibitedpromising properties for application in high-temperature PEMFCs.
김영광,윤성호,박주일,정두환,Jin Miyawaki,Isao Mochida 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Catalytic recovery after repeated uses of unsupported K2CO3 or K2CO3 supported on 3 kinds ofperovskites (LaMn0.8Cu0.2O3, LaMn0.8Cu0.2O3/g-alumina, and La0.9K0.1MnO3) was investigated duringsteam gasification of an Indonesian lignite (Adaro) at 700 ℃. Perovskite supports effectively retainedK2CO3 and maintained higher catalytic activity than K2CO3 alone. The supported catalysts wererecovered from the ash after gasification based on their size and ferromagnetism. Quartz and aluminaaccumulation on the catalyst poisoned the ash due to reactivity with potassium. Catalytic activity as highas 90% carbon conversion was maintained up to seven cycles, and separation from the ash aftergasification regenerated the activity.
Behaviors of metal compounds during hydrodemetallization of atmospheric residue
박주일,Adel Al-Mutairi,Abdulazeem M.J. Marafie,Isao Mochida,윤성호,Xiaoliang Ma 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
Behaviors of vanadium and nickel species during hydrodemetallization (HDM) were studied. A Kuwaitatmospheric residue and its hydrodemetallized products from a pilot plant at mild and severe reactionconditions were characterized by using GPC coupled with ICP-MS and high temperature GC-AED afterseparation of them into saturates, aromatics, resins, and asphaltenes. It was found that the HDMreactivity of the vanadium species, especially those with lower molecular weight, was higher than that ofNi species, probably due to the higher polarity of the former than the latter. HDM of the vanadiumspecies in the asphaltene was more difficult than that in the resin. The average molecular weight of metalspecies through higher temperature HDM was higher than that through the lower temperature HDM,although the metal removal at the higher temperature is higher.
Lee, Chanmin,Na, Heesoo,Jeon, Yukwon,Jung Hwang, Ho,Kim, Hyun-Jong,Mochida, Isao,Yoon, Seong-Ho,Park, Joo-Il,Shul, Yong-Gun Elsevier 2019 Journal of industrial and engineering chemistry Vol.74 No.-
<P><B>Abstract</B></P> <P>Poly(ether imide) (PEI) membranes for polymer electrolyte membrane fuel cells (PEMFCs) are prepared by the electrospinning method. This approach produces a membrane with a high porosity and surface area that is suitable for accommodating proton-conducting materials. A composite membrane was prepared by impregnating the pores of the electrospun PEI membrane with Aquivion ionomer. Then, an inorganic proton conductor in the form of SiO<SUB>2</SUB>/heteropolyacid (HPA) nanoparticles was prepared by a microemulsion process and the particles added to the Aquivion ionomer. The membranes were characterized by field emission scanning electron microscopy (FE-SEM) and single-cell performance testing for PEMFC. The durability of the composite membrane was assessed via accelerated lifetime and on/off tests.</P> <P>The ionomer-impregnated electrospun PEI membrane showed good thermal stability, satisfactory mechanical properties, and high proton conductivity. The addition of the SiO<SUB>2</SUB>/HPA nanoparticles improved the proton conductivity of the composite membrane, thereby allowing the operating temperature in low humidity environments to be extended. The composite membrane exhibited promising properties for application in high-temperature PEMFCs.</P>
Catalytic oxidation of polycyclic aromatic hydrocarbons (PAHs) over SBA-15 supported metal catalysts
Seong-Ho Yoon,Joo-Il Park,Jihn-Koo Lee,Jin Miyawaki,Isao Mochida 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2
Naphthalene was chosen as a model reactant of PAHs, and its catalytic destruction aimed to reduce the content of PAHs in diesel fuels was investigated over three different metal (Pt, Ru and Mo) catalysts supported on SBA-15 and g-alumina. The catalysts were characterized by N2-sorption isotherms, CO and NO chemisorptions, temperature programmed desorption of naphthalene and NH3, and 27Al MAS NMR. The SBA-15 supportedmetal catalysts showed a better activity at lower reaction temperature than the galumina supported ones, most probably due to higher metal dispersion and enhanced mesoaccessibility. Pt/SBA-15 catalyst exhibited the highest activity, corresponded to Ru or Mo/SBA-15catalyst, as reasoned by the temperature programmed desorption of naphthalene. The improved catalytic performances and thermal stability of catalysts could be achieved by incorporation of Al species into SBA-15. The characteristics of Pt states and complex on the surface of acidic supports could lead to the enhanced catalytic activity of naphthalene oxidation, as well as the limited sintering of Pt particles at high temperature, giving rise to thermal stability of catalysts.
Analysis and deep hydrodesulfurization reactivity of Saudi Arabian gas oils
김태곤,박주일,Syed Ahmed Ali,Khalid Alhooshani,Mohammed Al-Yami,윤성호,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Gas oils obtained from Arabian Light (AL-GO), Arabian Medium (AM-GO) and Arabian Heavy (AH-GO)crude oils were subjected to detailed analysis in terms of reactive and refractory sulfur, nitrogen, as well as aromatic species. Deep hydrodesulfurization (HDS) of these gas oils over SiO2–Al2O3-supported CoMo and NiMo catalysts was studied using autoclave reactor either in one- or two-stage operations. AL-GO was easily and deeply desulfurized to 15 ppm over CoMo/Al2O3–SiO2 (catalyst X) at 340 8C and 5 MPa (H2) for 2 h. At the same conditions, AM-GO and AH-GO could be desulfurized to 70 and 78 ppm,respectively. Two-staged HDS, by combining CoMo and NiMo catalysts, in successive steps resulted in effective deep HDS. The replacement of hydrogen atmosphere after the first-stage (1 h) enhanced the AH-GO HDS during the second-stage (1 h) to 9 ppm. However, replacing the hydrogen in the secondstage with 5% H2S in hydrogen inhibited the HDS, resulting in product sulfur content of 15 ppm. Analysis of sulfur species indicate that significant fraction of reactive and refractory sulfur species were removed during the first-stage whereas the remaining refractory sulfur species were removed during the second-stage. Kinetic analysis indicates overwhelming influence of refractive sulfur species on the overall HDS. The results from this study show that two-stage scheme with optimum catalysts in series can be applied to overcome the difficulty to achieve deep HDS of AH-GO.
Analysis of water in Loy Yang brown coal using solid-state 1H NMR
김현석,윤성호,Yusuke Nishiyama,Keiko Ideta,Jin Miyawaki,Yohsuke Matsushita,박주일,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
1H spin-echo MAS NMR and 1H saturated spin-echo MAS NMR were applied to classify the water in Loy Yang coal. Adsorbed water was examined based on the proton spectra, in which four major portions were identified according to the moisture contents. Free water could be quantified by analyzing the proton free induction decays (FIDs) obtained using the 1H saturated spin-echo technique. By comparing the proton intensity of the C–H portion to the aromatic and N portion in the proton spectra, and by evaluating the FIDs, the water in Loy Yang coal could be classified.
Yong Jiang,Keiko Ideta,김잔디,Jin Miyawaki,정두환,윤성호,Isao Mochida 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
The crystalline and microstructural transformations of two laboratory ashes and their quenched slags(froma gasifier) with similar chemical compositions (one with high silicon dioxide (SiO2) concentrationsand the other with high aluminum oxide (Al2O3) concentrations)were systematically characterized usingX-ray diffraction, multinuclear solid-state nuclear magnetic resonance, and a high-temperatureviscometer. The results show that the content of SiO2 and Al2O3 in ash has significant influence onthe crystal types and size of cristobalite clusters in the liquid slag during heat treatment. Consequently,the formed cristobalite clusterswas the crucial to the viscosities and rheological properties of liquid slags.
Yong Jiang,윤성호,Xiongchao Lin,Keiko Ideta,Hiromichi Takebe,Jin Miyawaki,Isao Mochida 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The transformation of the Si-Al microstructures of slags, which have similar SiO2 + Al2O3 and CaO contents but different SiO2/Al2O3 ratios, was quantified using multinuclear SS-NMR. Three kinds of Si Qn microstructures (Q2, Q3, and Q4), where n denotes the number of bridging oxygen linked to other Si atoms for each Q (SiO4) unit, and one Al structure (Al (IV)) were present in both slags. The Q3 percentage in two slags was increased as increase of temperature from 1200 to 1600 8C. The transformation of Si-Al microstructures was interpreted by a hypothetic model of cristobalite cluster based on the crystal and Qn structure.
Seong-Yop Lim,Doo-Hwan Jung,Seong-Ho Yoon,Isao Mochida 한국탄소학회 2008 Carbon Letters Vol.9 No.1
Understanding the exact structure and surface characteristics of carbon materials is very important for design, synthesis, and utilization of the best carbon form with particular functions and high performance for practical applications such as selective adsorption adsorbents, energy storage materials, catalysts or catalyst supports, etc. This review paper focuses on carbon surface properties and the interaction between gaseous or liquid substances and carbon surface. Catalytic functions of carbon materials are reviewed including recent progress in synthesis and applications of nano-carbons.