检索结果-南通市图书馆

Low molecular weight alkane-fed solid oxide fuel cells for power and chemicals cogeneration

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 711-735,I0015页

作者： Ermete Antolini Scuola di scienza dei materiali Cogoleto 16016GenovaItaly

This paper presents a review of low molecular weight alkane-fed solid oxide fuel cells(SOFCs),which,unlikely the conventional use of SOFCs for only power production,are utilized to cogenerate produce useful chemicals at the same time.The cogeneration processes in SOFC have been classified according to the different types of fuel.C_(2)and C_(3)alkenes and synthesis gas are the main cogenerated chemicals together with electricity.The chemicals and energy cogeneration in a fuel cell reactor seems to be an effective alternative to conventional reactors for only chemicals production and conventional fuel cells for only power production.Although,the use of SOFCs for chemicals and energy cogeneration has proved successful in the industrial setting,the development of new catalysts aimed at obtaining the desired chemicals together with the production of a high amount of energy,and optimizing SOFC operation conditions is still a challenge to enhance system performance and make commercial applications workable.

关键词： Solid oxide fuel cells Alkane Alkene Syngas Cogeneration

A Few Questions about Single-Atom Catalysts:When Modeling Helps

在线全文

学校读者我要写书评

暂无评论

Accounts of Materials Research 2022年第9期3卷 986-995页

作者： Giovanni di Liberto Sergio Tosoni Luis A.Cipriano Gianfranco Pacchioni dipartimento di scienza dei materiali Universitàdi Milano-Bicocca20125 MilanoItaly

CONSPECTUS:Single-atom catalysis(SAC)is a fascinating and rapidly growing field in heterogeneous catalysis.In less than 20 years,this has become one of the most widely investigated subjects by the catalytic community for various good reasons:the ability to synthesize active catalysts using a minimum amount of precious metals,the expected higher selectivity of SACs compared to assemblies of nanoparticles of variable sizes,and the fact that SACs represent a bridge between homogeneous and heterogeneous catalysis.

关键词： catalysis catalysis sizes

On the Properties of the Forced Unsteady-state Ring Reactor Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2004年第3期12卷 408-414页

作者： Davide FISSORE Antonello A.BARRESI Salvatore VELARdi Marco VANNI dipartimento di scienza dei materiali e Ingegneria Chimica Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino ItalyDipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino ItalyDipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino ItalyDipartimento di Scienza dei Materiali e Ingegneria Chimica Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino Italy

The multi-reactors network, a closed sequence of two or more catalytic fixed bed reactors with periodical change of the feed position, was studied by means of numerical simulations. Two advantages of such a reactor configuration, the possibility of exploiting the thermal storage capacity of the catalyst and the optimal temperature profile for exothermic equilibrium-limited reactions, were analyzed. The former feature acting as a regenerative heat exchanger was simulated in the case of the combustion of lean volatile organic compound (VOC) mixtures, with the possibility of multiple stability windows found when rich mixtures are fed. The latter was demonstrated using the methanol synthesis, with the enhancement of the conversion and product selectivity predicted. The influence of the number of the reactors in the network was pointed out. Some results obtained in the reverse-flow reactors were also presented for comparison.

关键词：化学反应器甲醇反应工程学移动床有机化合物

Inclusion of infrared dielectric screening in the GW method from polaron energies to charge mobilities

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1300-1307页

作者： Paolo Umari dipartimento di Fisica e Astronomia Universitàdi Padovavia Marzolo 8I-35131PadovaItaly CNR-IOM Istituto Officina dei materiali Consiglio Nazionale Delle RicercheArea Science ParkStrada Statale 14km 163.5I-34149TriesteItaly

We introduce in the many-body GW scheme the modulation of the screened Coulomb interaction W arising from the macroscopic dielectric response in the infrared.We derive expressions for the polaron binding energies,the renormalization of the effective masses and for the electron and hole relaxation times.Electron and hole mobilities are then obtained from the incorporation of appropriate scattering rules.Zinc-blende GaN and orthorhombic MAPbI3 are used as test beds finding fair agreement with results from rigorous electron-phonon coupling approaches.Although limited to polar phonons,our method has a negligible computational cost.

关键词： dielectric polaron negligible

InN/InGaN quantum dot electrochemical devices:new solutions for energy and health

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2017年第2期4卷 184-195页

作者： Richard Ntzel South China Academy of Advanced Optoelectronics South China Normal University L-NESS and dipartimento di scienza dei materiali Università di Milano-Bicocca

A review is given of the exceptional electrochemical performance of epitaxial InN/InGaN quantum dots(QDs) as photoelectrodes for solar hydrogen generation by water spliting, as biosensor transducers and as anion-selective electrodes, and they are also evaluated as supercapacitor electrodes. he performance is benchmarked against the best performances of other reported materials and nanostructures. A model based on the unique interplay of surface and quantum properties is put forward to understand the boost of catalytic activity and anion selectivity interlinking quantum nanostructure physics with electrochemistry and catalysis. Of equal impact is the direct growth on cheap Si substrates without any bufer layers, allowing novel device designs and integration with Si technology. his makes the InN/InGaN QDs viable, opening up new application ields for Ⅲ-nitride semiconductors.

关键词： quantum dot solar hydrogen biosensor ion-selective electrode supercapacitor InN InGaN

Corrosion Behaviour of Zr-Ag Alloys for Dental Implant Application

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2023年第11期14卷 501-514页

作者： Francesco Rosalbino Daniele Macciò Giorgio Scavino dipartimento di scienza dei materiali e Ingegneria Chimica (diCHI) Politecnico di Torino Torino Italy dipartimento di Chimica e Chimica Industriale (DCCI) Università Degli Studi di Genova Genova Italy

The electrochemical corrosion behaviour of three Zr-Ag alloys (Zr-1Ag, Zr-3Ag and Zr-5Ag) was investigated. Open circuit potential, linear potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were employed in aerated artificial saliva (pH = 4.0) at 37°C. Silver alloying additions are found to be effective in enhancing the corrosion resistance of zirconium in artificial saliva environment. In fact, Zr-Ag alloys exhibit higher open circuit potentials, larger breakdown potentials and higher impedance values as compared to cp Zr. This behaviour can be ascribed to the formation of a thicker and more stable passive film with increasing compactness, able to provide better protection against the corrosion attack.

关键词： Zr-Ag Alloys Corrosion Resistance Open Circuit Potential Potentiodynamic Polarization Curves Electrochemical Impedance Spectroscopy (EIS)

Functional group resolved NMR relaxation of 3-carbon adsorbates in mesoporous alumina

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Magnetic Resonance Letters 2023年第3期3卷 248-255,I0004页

作者： Neil Robinson Carmine D’Agostino Michael LJohns Department of Chemical Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Chemical Engineering The University of ManchesterOxford RoadManchesterM139PLUK dipartimento di Ingegneria Civile ChimicaAmbientale e Dei Materiali(DICAM)Alma Mater Studiorum e Universita di BolognaVia Terracini28Bologna40131Italy

NMR relaxation analysis provides a unique and non-invasive probe of fluid dynamics within porous materials,and may be applied to the interpretation of a wide variety of material and interfacial characteristics.Here,we report two-dimensional^(1)H T_(1)-T_(2)relaxation correlation measurements of a range of three-carbon adsorbates(1-propanol,2-propanol and propanoic acid)imbibed within the mesoporous metal oxide gamma-alumina.Our data,acquired across field strengths of 2 MHz,12.7 MHz and 43 MHz,clearly reveal two populations in each measurement,identified as the alkyl and hydroxyl moieties of each adsorbate.These results expand the range of materials in which such functional group resolved relaxation is known to occur,and demonstrate the clear persistence of such phenomena using a range of typical benchtop NMR systems employed to study fluid-saturated porous media.

关键词： NMR relaxation Adsorption Porous media Low-field NMR

Experimental characterization and CFD simulation of gas maldistribution in turbulent fluidization of Group A particles

在线全文

学校读者我要写书评

暂无评论

Particuology 2023年第11期82卷 192-203页

作者： Maurizio Troiano Benjamin Amblard Sina Tebianian Roberto Solimene Piero Salatino Thierry Gauthier dipartimento di Ingegneria Chimica dei Materiali e della Produzione IndustrialeUniversitàdegli Studi di Napoli Federico IIPiazzale Vincenzo Tecchio 8080125NapoliItaly IFP Energies nouvelles Rond-point de l'échangeur de Solaize BP 369360SolaizeFrance Istituto di Scienze e Tecnologie per l’Energia e la MobilitàSostenibili(STEMS) Consiglio Nazionale delle Ricerche(CNR)Piazzale Vincenzo Tecchio 8080125NapoliItaly

The study presented hereby investigates experimentally and with CFD simulations the gas distribution effect on the hydrodynamic of a Geldart Group A turbulent fluidized bed. Experiments were carried out on a cold flow fluidized bed column with an even and uneven gas distribution. Local solid volume fraction profiles were measured using optical probes at different bed heights and along two radial directions. Optical probe measurements allow catching a clear hydrodynamic difference between both even and uneven gas distributions. These results were then used to assess CFD simulations with the code Barracuda^(TM) (MP-PIC approach). It is noteworthy that the choice of drag correlation and boundary conditions strongly influences the agreement between the experimental and CFD results. Once the correct parameters are chosen, CFD simulations captured the effect of gas distribution changes.

关键词： Characterization of multiphase reactors Fluidized bed Turbulent Gas distribution Jet Optical probe CFD simulations

Light Electrospun Polyvinylpyrrolidone Blanket for Low Frequencies Sound Absorption

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第12期36卷 1368-1374页

作者： Joshua Avossa Francesco Brand Francesco Marulo Giuseppe Petrone Stefano Guido Giovanna Tomaiuolo Aniello Costantini dipartimento di Ingegneria Chimica dei Materiali e della Produzione lndustriale (DICMaPI) Universitgt degli Studi di Napoli Federico II Napoli Italy dipartimento di lngegneria Industriale (diI) Universita degli Studi di Napoli Federico II Napoli Italy

Light polymeric soundproofing materials （density = 63 kg/m3） of interest for the transportation industry were fabricated through electrospinning. Blankets of electrospun polyvinylpyrrolidone （average fiber diameter = （1.6 ± 0.5） or （2.8 ± 0.5） μm） were obtained by stacking disks of electrospun mats. The sound absorption coefficients were measured using the impedance tube instrument based on ASTM E1050 and ISO 10534-2. For a given set of disks （from a minimum of 6） the sound absorption coefficient changed with the frequency （in the range 200-1600 Hz） following a bell shape curve with a maximum （where the coefficient is greater than 0.9） that shifts to lower frequencies at higher piled disks number and greater fiber diameter. This work showed that electrospinning produced sound absorbers with reduced thickness （2-3 cm） and excellent sound-absorption properties in the low and medium frequency range.

关键词： Electrospinning Polyvinylpyrrolidone （PVP） Sound absorption Impedance tube