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Effect of silicon carbide-based iron catalyst on reactor optimization for non-oxidative direct conversion of methane

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Journal of Energy Chemistry 2023年第6期81卷 519-532,I0012页

作者： Eun-hae Sim Sung Woo lee Jin Ju lee Seung Ju Han Jung Ho Shin Gracia lee Sungrok Ko kwan-young lee Yong Tae Kim C1 Gas&Carbon Convergent Research Center Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Department of Chemical and Biological Engineering Korea University145 Anam-roSeoul 02841Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeoul 03722Republic of Korea Chemical Data-Driven Research Center Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Prospective Tech.Exploring Section Basic Chemical R&D centerLottechemical Corp.Daejeon 34059Republic of Korea Department of Advanced Materials and Chemical Engineering University of Science and Technology(UST)Gajeong-dongYuseongDaejeon 34113Republic of Korea

The conversion of methane to olefins,aromatics,and hydrogen(MTOAH)can be used to stably obtain hydrocarbons when the effect of the catalytic surface is optimized from the reaction engineering *** this study,Fe/Si C catalysts were packed into a quartz tube *** catalytic surfaces of Si C and the impregnated Fe species decreased the apparent activation energies(E_a)of methane consumption in the blank reactor between 965 and 1020℃.Consequently,the hydrocarbon yield increased by 2.4times at 1020℃.Based on the model reactions of ethane,ethylene,and acetylene mixed with hydrogen in the range of 500-1020℃,an excess amount of Fe in the reactor favored the C-C coupling reaction over the selective hydrogenation of acetylene;consequently,coke formation was favored over the hydrogenation *** gas-phase reactions and catalyst properties were optimized to increase hydrocarbon yields while reducing coke *** 0.2Fe catalyst-packed reactor(0.26 wt%Fe)resulted in a hydrocarbon yield of 7.1%and a coke selectivity of<2%when the ratio of the void space of the postcatalyst zone to the catalyst space was adjusted to be≥*** on these findings,the facile approach of decoupling the reaction zone between the catalyst surface and the gas-phase reaction can provide insights into catalytic reactor design,thereby facilitating the scale-up from the laboratory to the commercial scale.

关键词： Non-oxidative methane conversion Ethylene Aromatic Methane pyrolysis Fe/SiC Coke resistance Catalytic reactor

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High-throughput computational-experimental screening protocol for the discovery of bimetallic catalysts

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npj Computational Materials 2021年第1期7卷 1232-1241页

作者： Byung Chul Yeo Hyunji Nam Hyobin Nam Min-Cheol Kim Hong Woo lee Sung-Chul Kim Sung Ok Won Donghun Kim kwan-young lee Seung Yong lee Sang Soo Han Computational Science Research Center Korea Institute of Science and TechnologySeoulRepublic of Korea Department of Energy Resources Engineering Pukyong National UniversityBusanRepublic of Korea Materials Architecturing Research Center Korea Institute of Science and TechnologySeoulRepublic of Korea Department of Chemical and Biological Engineering Korea UniversitySeoulRepublic of Korea Department of Nanomaterials Science and Engineering Korea University of Science and TechnologyDaejeonRepublic of Korea Advanced Analysis Center Korea Institute of Science and TechnologySeoulRepublic of Korea

To accelerate the discovery of materials through computations and experiments,a well-established protocol closely bridging these methods is *** introduce a high-throughput screening protocol for the discovery of bimetallic catalysts that replace palladium(Pd),where the similarities in the electronic density of states patterns were employed as a screening *** first-principles calculations,we screened 4350 bimetallic alloy structures and proposed eight candidates expected to have catalytic performance comparable to that of *** experiments demonstrate that four bimetallic catalysts indeed exhibit catalytic properties comparable to those of ***,we discover a bimetallic(Ni-Pt)catalyst that has not yet been reported for H_(2)O_(2) direct *** particular,Ni_(61)Pt_(39) outperforms the prototypical Pd catalyst for the chemical reaction and exhibits a 9.5-fold enhancement in cost-normalized *** protocol provides an opportunity for the catalyst discovery for the replacement or reduction in the use of the platinum-group metals.

关键词： synthesis catalyst bimetallic

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Sorption enhanced catalytic CF4 hydrolysis with a three-stage catalyst-adsorbent reactor

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Frontiers of Chemical Science and Engineering 2017年第4期11卷 537-544页

作者： Han, Jae-Yun Kim, Chang-Hyun Nam, Sung-Chan Ryi, Shin-Kun lee, Boreum Lim, Hankwon Jung, Ho-young lee, kwan-young Korea Inst Energy Res Adv Mat & Devices Lab Daejeon 34129 South Korea Catholic Univ Daegu Dept Adv Mat & Chem Engn Gyeongbuk 38430 South Korea Chonnam Natl Univ Dept Environm & Energy Engn Gwangju 61186 South Korea Korea Univ Dept Chem & Biol Engn Seoul 136701 South Korea

In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF4. Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca（OH）2 to remove HF. The three stages are connected in series to enhance the hydrolysis of CF4 and eliminate a scrubber to dissolve HF in water at the same time. With a 10 wt-% Ce/AlaO3 catalyst prepared by the incipient wetness method using boehmite and a granular calcium hydroxide as an adsorbent, the CF4 conversion in our proposed reactor was 7%-23% higher than that in a conventional single-bed catalytic reactor in the temperature range of 923-1023 K. In addition, experimental and numerical simulation （Aspen HYSYS） results showed a reasonable trend of increased CF4 conversion with the adsorbent added and these results can be used as a useful design guideline for our newly proposed multistage reactor system.

关键词： PFCs catalytic hydrolysis calcium hydro-xide sorption enhanced process simulation

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Combination-based nanomaterial designs in single and double dimensions for improved electrodes in lithium ion-batteries and faradaic supercapacitors

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Journal of Energy Chemistry 2019年第11期28卷 119-146页

作者： Tuyet Nhung Pham Duckshin Park Yongil lee Il Tae Kim Jaehyun Hur You-kwan Oh young-Chul lee Department of BioNano Technology Gachon University1342 SeongnamdaeroSujeong-guSeongnam-siGyeonggi-do 13120Republic of Korea Korea Railroad Research Institute(KRRI) 176 Cheoldobakmulkwan-roUiwang-si 16105Gyeonggi-doRepublic of Korea Department of Chemical and Biological Engineering Gachon UniversitySeongnam-siGyeonggi-do 13120Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea

In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted special attention as a result of the rapid development of new electrode nanomaterials, especially hybrid nanomaterials, which can meet the increasingly higher requirements for future energy, such as the capability to deliver high-power performance and an extremely long life cycle. In these hybrid nanostructures, a series of synergistic effects and unique properties arising from the combination of individual components are a major factor leading to improved charge/discharge capability, energy density, and system lifetime. This paper describes the most recent progress in the growth of hybrid electrode materials for LIBs and FSs systems, focusing on the combination of zero-dimensional(0 D), one-dimensional(1 D), two-dimensional(2 D), and three-dimensional(3 D) nanomaterials, respectively.

关键词： Hybrid nanomaterials Synergistic effects Zero-dimensional nanomaterials One-dimensional nanomaterials Two-dimensional nanomaterials Three-dimensional nanomaterials

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Comparison of magnetic properties of DNA-cetyltrimethyl ammonium complex with those of natural DNA

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Science China Chemistry 2012年第5期55卷 814-821页

作者： KWON young-Wan CHOI Dong Hoon JIN Jung-Il lee Chang Hoon KOH Eui kwan GROTE James G. Department of Chemistry Korea University Seoul 136-701 Korea Department of Polymer Science & Engineering Chosun University Gwangju 501-759 Korea Korea Basic Science Institute-Seoul Branch Korea University Seoul 136-701 Korea US Air Force Research Laboratory Materials and Manufacturing Directorate AFRL/MLPS Wright-Patterson Air Force Base Ohio USA

We prepared the DNA-cetyltrimethyl ammonium complex, as well as the same complex intercalated with stable organic free radicals, and studied their magnetic properties by electron magnetic resonance (EMR) spectroscopy and by measuring the magnetization on a superconducting quantum interference device (SQUID). The UV-vis and CD spectra of DNA-quaternary alkyl ammonium complex (DNA--Q+) in organic solvent clearly demonstrated that it retained the double helical B-form conformation. The interhelical spacing of double strand DNA (dsDNA) increased when the counter ions (Na+) of phosphate groups of the natural DNA were replaced with the long alkyl quaternary ammonium groups. The inter-helical distance of DNA-cetyltrimethyl ammonium (CTMA) was 39.1  as confirmed by X-ray diffractometry. In general, the magnetization of the DNA-CTMA complex solid was found to be significantly lower than that of natural DNA. Moreover, intercalation of the complex with stable organic free radicals did not improve magnetization, which again was in marked contrast to natural DNA. EMR spectroscopic behavior of the complex in the solid state also was quite different from that of natural DNA: The unique broad EMR signal of natural DNA in the low field region with g-value greater than 10 disappeared in the DNA-CTMA complex.

关键词： natural DNA DNA-CTMA DNA-CTMA-PTMI magnetic property electron magnetic resonance (EMR) superconducting quantum interference device (SQUID)

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A case of colon perforation due to enteropathy-associated T-cell lymphoma

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World Journal of Gastroenterology 2013年第11期19卷 1841-1844页

作者： Jun Bong Kim Seong Hwan Kim young kwan Cho Sang Bong Ahn Yun Ju Jo young Sook Park Ji Hyun lee Dong Hee Kim Hojung lee Yun young Jung Department of Internal Medicine Eulji Medical CenterEulji UniversitySeoul 139-711South Korea Department of Surgery Eulji HospitalEulji Medical CenterSeoul 139-711South Korea Department of Pathology Eulji HospitalEulji Medical CenterSeoul 139-711South Korea Department of Radiology Eulji HospitalEulji Medical CenterSeoul 139-711South Korea

Enteropathy-associated T-cell lymphoma (EATL) is an extremely rare disease, which is often related to gluten-sensitive enteropathy. It is an uncommon intestinal lymphoma with very poor prognosis and high mortality rate. In the absence of specific symptoms or radiological findings, it is difficult to diagnose early. Major complications of EATL have been known as intestinal perforation or obstruction, and only 5 cases of EATL are reported in South Korea. In this study, we report a case of 71-year-old male with symptoms of diarrhea, which later it progressed into cancer perforation of the colon. The initial colonoscopic findings were normal and computed tomography scan demonstrated a segmental wall thickening of the distal ascending colon with nonspecific multiple small lymphnodes, along the ileocolic vessels, but no signs of mass or obstruction. The histologic findings of resected specimen confirmed EATL type II. Patient expired two weeks after the operation. Therefore, we emphasize the need of random biopsy in the presence of normal mucosa appearance on colonoscopy for the early diagnosis of EATL.

关键词： Enteropathy-associated T-cell lymphoma type II Intestinal perforation Gastrointestinal lymphoma Celiac disease

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Lens culinaris agglutinin-reactive fraction of alpha-fetoprotein improves diagnostic accuracy for hepatocellular carcinoma

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World Journal of Gastroenterology 2021年第28期27卷 4687-4696页

作者： Han Ah lee Yoo Ra lee young-Sun lee young Kul Jung Ji Hoon Kim Hyunggin An Hyung Joon Yim Yoon Tae Jeen Jong Eun Yeon kwan Soo Byun Yeon Seok Seo Department of Internal Medicine Korea University College of MedicineSeoul 02841South Korea Department of Biostatistics Korea University Anam HospitalSeoul 02841South Korea

BACKGROUND Diagnostic accuracy of various tumor markers and their combinations for hepatocellular carcinoma(HCC)was not fully *** To evaluate the diagnostic accuracy of alpha-fetoprotein(AFP),the Lens culinaris agglutinin-reactive fraction of AFP(AFP-L3),and protein induced by vitamin K absence or antagonist-II(PIVKA-II)and their combination for HCC *** Patients with newly detected liver mass or elevated serum AFP levels were considered *** AFP level,AFP-L3 fraction,and PIVKA-II level were measured at the first *** In total,622 patients were included;355 patients(57.1%)had chronic liver disease,and 208(33.4%)had liver *** was diagnosed in 160 patients(25.7%).The area under the receiver operating characteristics curves(AUROCs)of the serum AFP,AFP-L3 fraction,AFP-L3,and PIVKA-II levels for the diagnosis of HCC were 0.775,0.792,0.814,and 0.834,respectively.A novel diagnostic model was developed by classifying patients in a 1:1 ratio into training and validation *** the binary regression analysis of the training cohort,the AFP,AFP-L3 fraction,and PIVKA-II(ALPs)score was calculated as follows:ALPs score=3.8×[serum AFP level(ng/mL)×AFP-L3 fraction(%)×0.01]+0.2×PIVKA-II level(mAU/mL).The AUROC of the ALPs score for diagnosis of HCC was 0.878,significantly higher than that of serum AFP level(P<0.001),AFP-L3 fraction(P<0.001),PIVKA-II level(P=0.036),and AFP-L3 level(P=0.006).The optimal ALPs score cut-off was 5.3(sensitivity,85.0%,specificity 80.1%).The validation cohort showed similar *** The ALPs score calculated using serum AFP level,AFP-L3 fraction,and PIVKA-II level showed improved accuracy in HCC diagnosis.

关键词： Alpha-fetoprotein Lens culinaris agglutinin-reactive fraction of alphafetoprotein Protein induced by vitamin K absence or antagonist-II Hepatocellular carcinoma

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Ssu72 is a T-cell receptor-responsive modifier that is indispensable for regulatory T cells

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Cellular & Molecular Immunology 2021年第6期18卷 1395-1411页

作者： Jin-kwan lee Seo-young Koo Hye-Mi Nam Jee-Boong lee Jiwon Ko Kyung-Mo Kim Eun-Ji Park Tae Jin Kim Ho lee Heounjeong Go Chang-Woo lee Research Institute Curogen TechnologySuwonSouth Korea Department of Molecular Cell Biology Samsung Medical CenterSungkyunkwan University School of MedicineSuwonSouth Korea MOGAM Institute for Biomedical Research GyeonggiSouth Korea Department of Pathology Asan Medical CenterUniversity of Ulsan College of MedicineSeoulSouth Korea Asan Institute for Life Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoulSouth Korea Department of Immunology Sungkyunkwan University School of MedicineSeoulSouth Korea Department of Cancer Biomedical Science Graduate School of Cancer Science and PolicyResearch InstituteNational Cancer CenterGyeonggiSouth Korea

The homeostatic balance between effector T cells and regulatory T cells(Tregs)is crucial for adaptive immunity;however,epigenetic programs that inhibit phosphorylation to regulate Treg development,peripheral expression,and suppressive activity are ***,we found that the Ssu72 phosphatase is activated by various T-cell receptor signaling pathways,including the T-cell receptor and IL-2R pathways,and localizes at the cell *** of Ssu72 in T cells disrupts CD4+T-cell differentiation into Tregs in the periphery via the production of high levels of the effector cytokines IL-2 and IFNγ,which induce CD4+T-cell activation and differentiation into effector cell *** also found a close correlation between downregulation of Ssu72 and severe defects in mucosal tolerance in ***,Ssu72 forms a complex with PLCγ1,which is an essential effector molecule for T-cell receptor signaling as well as Treg development and ***72 deficiency impairs PLCγ1 downstream signaling and results in failure of Foxp3 ***,our studies show that the Ssu72-mediated cytokine response coordinates the differentiation and function of Treg cells in the periphery.

关键词： Ssu72 Regulatory T cells FoxP3 T cell receptor Autoimmunity

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Efficacy and safety of 0.4 percent sodium hyaluronate for endoscopic submucosal dissection of gastric neoplasms

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World Journal of Gastroenterology 2013年第20期19卷 3069-3076页

作者： young Dae Kim Jun lee Ju Yeon Cho Seok Won Kim Seong Hwan Kim young kwan Cho Jin Seok Jang Ji Sun Han Joo young Cho Division of Gastroenterology and Hepatology Department of Internal MedicineMedical SchoolChosun UniversityGwangju 501-717South Korea Department of Internal Medicine Eulji HospitalEulji UniversitySeoul 139-872South Korea Department of Internal Medicine Dong A University College of MedicineBusan 602-715South Korea Department of Internal Medicine Institute for Digestive ResearchDigestive Disease CenterSoonchunhyang University College of MedicineSeoul 140-743South Korea

AIM:To evaluate the efficacy and safety of sodium hyaluronate solution(SH) in endoscopic submucosal dissection(ESD) of gastric ***:A prospective multicenter randomized,double blind,controlled trial was designed and utilized in this study.A total of 76 patients with 5-20 mm sized gastric neoplasms were enrolled at three academic hospitals in South Korea from June 2011 to October *** were randomly assigned to the 0.4% sodium hyaluronate or control *** lesions underwent endoscopic *** was performed with 0.4%SH and normal saline(NS) solution for submucosal *** was assessed using en bloc resection and the number of additional *** evaluation variables were the volume of injection material,steepness of mucosal elevation,bleeding rate,procedural time and operator ***,the safety was assessed by analyzing adverse events during the ***:The usefulness rate in the 0.4%SH group and the controlled group had statistically significant difference under intention to treat(ITT) analysis(90.91% vs 61.11% P = 0.0041).Under per protocol(PP),the usefulness rate is statistically significant different(93.10% vs 61.76%,P = 0.0036).The difference in volume of the solution injected between 0.4%SH group and the controlled group and NS group was also statistically significant under intention to treat and per protocol analysis(ITT:0.03 ± 0.02 mL vs 0.06 ± 0.03 mL,P = 0.0003,PP:0.03 ± 0.02 mL vs 0.06 ± 0.03 mL,P = 0.0004).Satisfaction above the grade good was significantly higher in the SH group under intention to treat and per protocol analysis(ITT:90.91% vs 61.11%,P = 0.0041,PP = 93.11% vs 61.77%,P = 0.0022).Adverse events above grade 3 were not noticed in either *** adverse events were treated and were judged as not associated with the submucosal injection ***:0.4%SH solution is a safe and effective agent that doesn't cause any significant adverse events and is useful for submucos

关键词： Sodium hyaluronate Endoscopic submucosal dissection Gastric neoplasm Endoscopic mucosal resection

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Characteristics of Algal Succession Following Rock Scraping at Imwon Area in the East Coast of Korea

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Journal of Ocean University of China 2016年第6期15卷 1087-1093页

作者： young Dae Kim Jung kwan Alan Myung Mo Nam Chu lee Hyun Il Yoo Su Yeoung Yeon young Hwan Kim Jang Kyun Kim Jae Suk Choi East Sea Fisheries Research Institute National Fisheries Research & Development Institute Gangneung 210-860Republic of Korea Korea National Park Service National Park Research Institute Yeosu 550-833 Republic of Korea Seaweed Research Center 1rational Fisheries Research & Development lnstituie Mokpo 530-831 Republic of Korea Department of Biology Chungbuk National University Chongju 361-763 Republic Of Korea Department of Marine Science School of Natural Sciences Incheon National University 22012 Yeonsu-gu Incheon Korea Department of Marine Sciences University of Connecticut 06901 Stamford Connecticut USA Division of Bioindustry Silla University Sasang-gu Busan 617-736 Republic of Korea

Abstract This study was conducted to clarify the characteristics high-pressure water sprayer in the period from June 2010 to April 2011 of algal succession following rock scraping using hoe or We divided the research area off the eastern coast of Korean near Imwon into 3 categories depending upon the severity of the barren ground, i.e., the urchin barren-affected, urchin bar- ren-ongoing and urchin barren-free areas. In April 2011, in the urchin barren-affected area with 25 seaweed species, the cover per- centage and importance value （IV） of erustose coralline algae were higher than those of other species. In the urchin barren-ongoing area with 33 seaweed species, crustose coralline algae （mean IV=62%） as well as Sargassum sp. （mean IV=28%）, and Gelidium amansii （mean IV= 19%） were observed following rock scraping. In the urchin barren-free area where seaweed communities were relatively abundant with 42 species, a variety of algal species including G. amansii （mean IV = 32%） underwent algal succession. Overall, it was observed that, as an aspect of algal succession, the weaker the barren ground severity was, the more frequent and di- verse the seaweeds were, and the more complex the succession pattern was in the study. As an aspect of recovering algal community, rock scraping using hoe was shown to be superior to the method using high-pressure water spraying. Therefore, we conclude that rock scraping using hoe is a very effective strategy for recovering the algal community in urchin barren-ongoing area.

关键词： algal succession sea-urchin barren ground rock scraping subtidal zone

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