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The Biosurfactant Surfactin as a Kinetic Promoter for Methane Hydrate Formation

Energy Procedia 2017年 105卷 5011-5017页

作者： Gaurav Bhattacharjee Vivek Barmecha Darshan Pradhan Rajesh Naik Kirti Zare Rahul B. Mawlankar Syed G. Dastager Omkar S. Kushwaha Rajnish Kumar Chemical Engineering and Process Development Division CSIR-National Chemical Laboratory Pune 411008 Maharashtra India Chemical Engineering Department Padmashree Dr. D. Y. Patil Institute of Engineering Management and Research Pune 411044 Maharashtra India NCIM Resource Center CSIR-National Chemical Laboratory Pune 411008 Maharashtra India

In the present study, the effect of the biosurfactant Surfactin on methane hydrate formation kinetics was studied. Initially, several marine derived species were screened for the presence of Surfactin. The polymerase chain reaction technique was used as the preliminary screening step for Surfactin which was then followed up by a couple of different assays to provide conclusive evidence of the same. Based on these tests, the D-9 bacterial strain was identified as a producer of Surfactin. Once the presence of Surfactin had been proven, its effect on methane hydrate formation kinetics was investigated upon by carrying out hydrate formation experiments in a stirred tank reactor. The cell free supernatant containing Surfactin was itself used as the hydrate forming solution without any further processing. It was found that the presence of Surfactin in the system greatly enhances hydrate formation kinetics as compared to pure water. In fact the kinetics in presence of Surfactin also surpassed that obtained with 1 wt% SDS, the most commonly used synthetic kinetic hydrate promoter. This basic study can pave the way for more sophisticated research on the use of biosurfactants as kinetic promoters with a view on rapid methane hydrate formation kinetics for applications such as methane separation, storage and transport.

关键词： Gas hydrate biosurfactant lipopeptide kinetic promoter gas uptake

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Environmental Matrix Effects on Degradation Kinetics of Ibuprofen in a UV/ Persulfate System

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Journal of Advanced Oxidation Technologies 2018年第1期21卷

作者： Su, Rongkui Wei, Zongsu Luo, Shuang Spinney, Richard Gao, Lingwei Liu, Yucheng Wu, Chuan Chai, Liyuan Xiao, Ruiyang Institute of Environmental Engineering School of Metallurgy and Environment Central South University Changsha410083 China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha410083 China Grand Water Research Institute - Rabin Desalination Laboratory Wolfson Faculty of Chemical Engineering Technion - Israel Institute of Technology Technion City Haifa32000 Israel Department of Chemistry and Biochemistry Ohio State University ColumbusOH43210 United States

In this study, we investigated the removal efficiency of an anti-inflammatory analgesic compound ibuprofen (IBU) in a UV/persulfate system under various environmentally relevant conditions. The effects of water matrix, including natural organic matter (NOM), sulfate anion (SO42-), nitrate anion (NO3-) and chloride anion(Cl-)were evaluated. Our results showed that the degradation kinetics of IBU was significantly enhanced in the presence of persulfate and the dominant degradation pathway was determined to be viasulfate radical anion (SO4·-) oxidation. The second order rate constant of IBU reacting with SO4·-was determined to be (1.26± 0.09)× 109M-1s-1at pH = 7.55. The observed pseudo first-order rate constants for IBU degradation (kobs) increased with the persulfate dosage, but it significantly decreased in the presence of NOM. The presence of SO42-and NO3-did not exhibit impact on the degradation of IBU, but the kobs values slightly decreased by about 15%in the presence of 5mM Cl-. The inhibition effect of Cl-might be due to secondary chlorine-derived radicals competing for SO4·-, resulting in a reduced IBU degradation kinetics.

关键词： Rate constants

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Electrochemical and Photoelectrochemical Water Oxidation for Hydrogen Peroxide Production

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Angewandte Chemie 2020年第19期133卷

作者： Dr. Yudong Xue Dr. Yunting Wang Prof. Zhenhua Pan Prof. Kazuhiro Sayama College of Engineering Korea University Seoul 136-701 Republic of Korea Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China School of Chemical and Environmental Engineering China University of Mining and Technology of Beijing Beijing 100083 P. R. China Department of Applied Chemistry Faculty of Science and Technology Chuo University 1-13-27 Kasuga Bunkyo Tokyo 112-8551 Japan Global Zero Emission Research Center (GZR) National Institute of Advanced Industrial Science and Technology (AIST) Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan

Hydrogen peroxide (H 2 O 2 ), as a green fuel and oxidant, has drawn increasing attention in the energy and environmental research. Compared with the traditional anthraquinone process, the electrochemical (EC) and photoelectrochemical (PEC) syntheses of H 2 O 2 are cost-effective and environmentally friendly. In order to construct membraneless EC/PEC devices for the full H 2 O 2 synthesis, anodic H 2 O 2 production by water oxidation, which is less developed than cathodic H 2 O 2 generation, is highly desirable. Here, we review recent developments for the EC/PEC H 2 O 2 production by water oxidation, including fundamental aspects, benchmarking activity evaluation, material/catalyst selection, and strategies for increasing selectivity, efficiency, and accumulation. Furthermore, we discuss the challenges and outlook of water oxidation for H 2 O 2 production, especially device-level development, accumulation and stability, and industrial applications. Our review is intended to stimulate studies further improving EC/PEC H 2 O 2 production.

关键词： electrochemistry hydrogen peroxide photoelectrochemistry water oxidation

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Correction to: A study on stability of active layer of polymer solar cells: effect of UV–visible light with different conditions

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Polymer Bulletin 2019年第4期77卷 2179-2179页

作者： Umer Mehmood Khalil Harrabi Ibnelwaleed A. Hussein Nagendiran Shanmugam A. Mekki M. Mekki M. A. McLachlan Center of Research Excellence Renewable Energy (CoRE‑RE) Research Institute (RI) King Fahd University of Petroleum and Minerals (KFUPM) Dhahran Kingdom of Saudi Arabia Department of Polymer and Process Engineering University of Engineering and Technology Lahore Lahore Pakistan Department of Physics KFUPM Dhahran Kingdom of Saudi Arabia Gas Processing Center Qatar University Doha Qatar Chemical Engineering Department KFUPM Dhahran Kingdom of Saudi Arabia Department of Materials and Centre for Plastic Electronics Imperial College London London UK

The original article was published with incorrect affiliation of Prof. Ibnelwaleed Hussein as well as the project number in the acknowledgment.

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Hybrid short path evaporation as an option to lactic acid recovery from fermentation broth

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chemical engineering Transactions 2017年 57卷 37-42页

作者： Oliveira, Regiane A. Komesu, Andrea Rossell, Carlos E. Vaz Maciel, Maria R. Wolf Filho, Rubens Maciel Laboratory of Optimization Design and Advanced Process Control School of Chemical Engineering University of Campinas Brazil National Laboratory of Science and Technology of Bioethanol National Center for Research in Energy and Materials Brazil

ISBN: (纸本)9788895608488

Hybrid short path evaporation (HSPE) is proposed as an alternative separation process with potentiality for recovery and concentration of thermally unstable molecules such as lactic acid. This work aimed to analyze the influence of HSPE process variables on the concentration of lactic acid from sugarcane molasses. Through 22 factorial experimental design, the influence of evaporator temperature (from 115 to 135 °C) and internal condenser temperature (from 13 to 22 °C) on lactic acid concentration and mass percentage of residue and distillate stream were studied. The results showed that it is possible to increase the lactic acid concentration greater than twice from fermentation broth by HSPE. In addition, the effect of each variable studied and interactions between them were demonstrated. © Copyright 2017, AIDIC Servizi S.r.l.

关键词： Lactic acid

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Graphene induced growth of Sb 2 WO 6 nanosheets for high-performance pseudocapacitive lithium-ion storage

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Journal of Alloys and Compounds 2020年 839卷

作者： Fei Wang Yong Liu Huijie Wei Guangxin Wang Fengzhang Ren Xianming Liu Min Chen Alex A. Volinsky Shizhong Wei Yan-Bing He Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal new Materials and Advanced Processing Technology National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of Non-Ferrous Materials Science & Processing Technology School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471023 PR China Key Laboratory of Function-oriented Porous Materials College of Chemistry and Chemical Engineering Luoyang Normal University Luoyang 471934 PR China School of Materials Science and Energy Engineering Foshan University Foshan 528000 PR China Department of Mechanical Engineering University of South Florida Tampa FL 33620 USA Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 PR China

Transition metal oxides with the Aurivillius structure have been studied as electrode materials in lithium-ion batteries (LIBs) owing to their high capacity and proper redox voltage. With the opened Aurivillius structure, the antimony tungstate (Sb 2 WO 6 , SWO) constituted of {Sb 2 O 2 } 2n+ and {WO 4 } 2n− is rarely used as negative electrode material for lithium-ion batteries. Herein, the SWO nanosheets/reduced graphene oxide (rGO) hybrid clusters were synthesized, and their electrochemical performances, kinetics and lithium storage mechanism were systematically studied as negative electrode materials for LIBs. Results show that the graphene oxide (GO) not only restricts the growth of layered-structure SWO, but also induces SWO growth along (002) lattice plane and changes SWO particles to SWO nanosheets. The strong interaction between SWO nanosheets and rGO greatly improve conductivity and structure stability of SWO nanosheets/rGO hybrid clusters, which also can efficiently alleviate agglomeration and volume change of SWO nanosheets during cycling. Meanwhile, the dominating pseudocapacitive contribution (78.2% at 0.8 mV s −1 ) effectively enhanced the electrochemical performance. As an anode material for LIBs, the SWO nanosheets/rGO hybrids deliver a high specific capacity of 1141 mAh g −1 at a current density of 0.2 A g −1 , and their specific discharge capacity is 595 mAh g −1 after 130 cycles at 0.2 A g −1 . This work demonstrates that the SWO nanosheets/rGO hybrid clusters are a promising negative electrode material for high-energy-density LIBs.

关键词： Sb 2 WO 6 nanosheets Graphene induced growth Hybrid clusters Pseudocapacitive Anode Lithium-ion batteries

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Preparation of CdTe Nanocrystals Doped Fluorescent Silica Spheres by Sol-gel Method and Their Surface Modification via Thiol-ene Chemistry

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chemical research in Chinese Universities 2017年第3期33卷 327-332页

作者： LIU Yan YU Dongdong ZHU Wei BAI Xiao SHEN Qihui LIU Xiaoyang ZHOU Jianguang Department of Chemistry and Pharmaceutical Engineering Jilin Institute of Chemical Technology Jilin 132022 P. R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changehun 130012 P. R. China Hospital of Zhejiang University Hangzhou 310027 P. R. China State Key Laboratory of Industrial Control Technology Research Center for Analytical Instrumentation College of Control Science and Engineering Zhejiang University Hangzhou 310058 P. R. China

A thcile one-step sol-gel method was used to prepare CdTe nanocrystals（NCs） doped silica microspheres with luxuriant thiol group on their surface using 3-mercaptopropyl trimethoxysilane（MPTMS） as organosilane in the aqueous solution. As the ligand and organosilane, MPTMS ensured the doping efficiency of CdTe NCs by ligand exchange and a large thiol group exposed to the solution to activate the surface of silica microspheres. The remodeled sol-gel process was performed at a lower temperature, which protected the thiol groups from degradation. Meanwhile, the particle size and size distribution can be controlled by varying synthesis conditions, such as the stirring rate and the reaction temperature. This user-friendly method provides a plattbrm tbr immobilization of chemical groups such as carboxyl for combination of bioactive and diagnostic molecules at the surface of CdTe NCs doped silica micro- spheres through thiol-ene chemistry for high-throughput microarrays.

关键词： Fluorescent silica sphere Semiconductor nanocrystal Sol-gel method

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Biomineralization and wellbore integrity: a microscopic solution to subsurface fluid migration 14

Biomineralization and wellbore integrity: a microscopic solu...

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14th International Conference on Greenhouse Gas control Technologies, GHGT 2018

作者： Kirkland, Catherine M. Norton, Drew O. Thane, Abby Hiebert, Randy Hommel, Johannes Kirksey, Jim Esposito, Richard Cunningham, Alfred B. Gerlach, Robin Spangler, Lee Phillips, Adrienne J. Center for Biofilm Engineering Montana State University 366 Barnard Hall BozemanMT59717 United States Department of Civil Engineering Montana State University 205 Cobleigh Hall BozemanMT59717 United States Department of Chemical and Biological Engineering Montana State University 306 Cobleigh Hall BozemanMT59717 United States Montana Emergent Technologies 160 W Granite St ButteMT59701 United States Department of Hydromechanics & Modeling of Hydrosystems University of Stuttgart Pfaffenwaldring 61 StuttgartD-70569 Germany Loudon Technical Services LLC 1611 Loudon Heights Rd CharlestonWV25314 United States Southern Company 600 18th St N BirminghamAL35203 United States Energy Research Institute Montana State University P.O. Box 172465 BozemanMT59717 United States

The keystone of subsurface fluid storage is the ability to inject and store fluids in underground reservoirs for extended periods of time. Concerns about leakage exist when storing fluids like CO2 or natural gas in the subsurface given their potential to damage functional groundwater aquifers or to be emitted to the atmosphere. Microbially-induced calcite precipitation (MICP) is showing significant promise as an emerging technology for subsurface engineering applications including sealing defects in wellbore cement and modifying the permeability of rock formations. MICP uses low viscosity fluids and microorganisms (~2 µm diameter) to induce calcium carbonate precipitation which can seal defects like micro-annuli, cracks, or channels. Calcium carbonate precipitation can be controlled to form seals capable of bridging small fluid migration pathways. In a laboratory study, MICP sealing of interface defects was visualized in a reactor designed to simulate a wellbore surrounded by a cement annulus with a channel defect of varying dimensions. The permeability of the defect decreased by over three orders of magnitude after MICP sealing. The observations made during this experiment suggest that in a channel defect of variable dimensions encountered in a downhole system, MICP would likely first form at a constriction in the primary flow path before filling secondary flow paths. Building on laboratory experiments such as this, the authors have conducted three successful MICP-based field demonstrations using the ureolytic bacterium, Sporosarcina pasteurii, to promote calcium carbonate precipitation in a variety of fracture and defect geometries. © 2018 GHGT 2018 - 14th International Conference on Greenhouse Gas control Technologies. All rights reserved.

关键词： Calcium carbonate

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Population of Merging Compact Binaries Inferred Using Gravitational Waves through GWTC-3

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Physical Review X 2023年第1期13卷 011048-011048页

作者： R. Abbott T. D. Abbott F. Acernese K. Ackley C. Adams N. Adhikari R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu P. F. de Alarcón S. Akcay S. Albanesi A. Allocca P. A. Altin A. Amato C. Anand S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando T. Andrade N. Andres T. Andrić S. V. Angelova S. Ansoldi J. M. Antelis S. Antier F. Antonini S. Appert Koji Arai Koya Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud M. Arogeti S. M. Aronson K. G. Arun H. Asada Y. Asali G. Ashton Y. Aso M. Assiduo S. M. Aston P. Astone F. Aubin C. Austin S. Babak F. Badaracco M. K. M. Bader C. Badger S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer A. Balsamo G. Baltus S. Banagiri D. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi C. P. L. Berry D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge R. Bhandare U. Bhardwaj D. Bhattacharjee S. Bhaumik I. A. Bilenko G. Billingsley S. Bini R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini L. D. Bonavena F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. Brandt J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic C. Buy R. L. Byer L. Cadonati LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics & Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Universitat de les Illes Balears IAC3–IEEC E-07122 Palma de Mallorca Spain University College Dublin Dublin 4 Ireland INFN Sezione di Torino I-10125 Torino Italy Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo I-80126 Napoli

We report on the population properties of compact binary mergers inferred from gravitational-wave observations of these systems during the first three LIGO-Virgo observing runs. The Gravitational-Wave Transient Catalog 3 (GWTC-3) contains signals consistent with three classes of binary mergers: binary black hole, binary neutron star, and neutron star–black hole mergers. We infer the binary neutron star merger rate to be between 10 and 1700 Gpc−3 yr−1 and the neutron star–black hole merger rate to be between 7.8 and 140 Gpc−3 yr−1, assuming a constant rate density in the comoving frame and taking the union of 90% credible intervals for methods used in this work. We infer the binary black hole merger rate, allowing for evolution with redshift, to be between 17.9 and 44 Gpc−3 yr−1 at a fiducial redshift (z=0.2). The rate of binary black hole mergers is observed to increase with redshift at a rate proportional to (1+z)κ with κ=2.9−1.8+1.7 for z≲1. Using both binary neutron star and neutron star–black hole binaries, we obtain a broad, relatively flat neutron star mass distribution extending from 1.2−0.2+0.1 to 2.0−0.3+0.3M⊙. We confidently determine that the merger rate as a function of mass sharply declines after the expected maximum neutron star mass, but cannot yet confirm or rule out the existence of a lower mass gap between neutron stars and black holes. We also find the binary black hole mass distribution has localized over- and underdensities relative to a power-law distribution, with peaks emerging at chirp masses of 8.3−0.5+0.3 and 27.9−1.8+1.9M⊙. While we continue to find that the mass distribution of a binary’s more massive component strongly decreases as a function of primary mass, we observe no evidence of a strongly suppressed merger rate above approximately 60M⊙, which would indicate the presence of a upper mass gap. Observed black hole spins are small, with half of spin magnitudes below χi≈0.25. While the majority of spins are preferentially aligned wi

关键词： Gravitational wave sources Gravitational waves Gravitational wave detection

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Performance analysis of solid-oxide electrolysis cells for syngas production by H2O/CO2 co-electrolysis

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chemical engineering Transactions 2017年 57卷 1627-1632页

作者： Saebea, Dang Authayanun, Suthida Patcharavorachot, Yaneeporn Soisuwan, Soipatta Assabumrungrat, Suttichai Arpornwichanop, Amornchai Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand Department of Chemical Engineering Faculty of Engineering Srinakharinwirot University Nakorn Nayok26120 Thailand School of Chemical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand Center of Excellence on Catalysis and Catalytic Reaction Engineering Department of Cehmical Engineering Chulalongkorn Univeristy Bangkok10330 Thailand Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

ISBN: (纸本)9788895608488

High-temperature solid oxide electrolysis cells (SOECs) are promising technologies to store excess renewable energy generation. In this work, the mathematical model of SOEC, which can describe the behaviour of a cathode-supported SOEC operating for H2O and CO2 co-electrolysis, is developed from mass balance, dusty gas model, and electrochemical model. The validated SOEC model is used to analyse the influence of the reversible water-gas shift reaction taking place on the cathode on the performance of the SOEC for syngas production. The simulation results show that the reverse water-gas shift reaction is highly pronounced at the cathode surface due to high CO2 component and can contribute to CO production. The rate of water-gas shift reaction increases along the depth of the cathode to the three-phase boundary. At the three-phase boundary, an increase in operating temperatures results in the enhancement of the rate of water-gas shift reaction. Additionally, regarding the SOEC performance, the electrical energy consumed for co-electrolysis in SOEC decreases with increasing temperature because the activation overpotentials and ohmic overpotentials are lower. © Copyright 2017, AIDIC Servizi S.r.l.

关键词： Water gas shift

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