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Revealing the unexpected promotion effect of EuO_x on Pt/CeO_2 catalysts for catalytic combustion of toluene

Chinese Journal of Catalysis 2019年第4期40卷 543-552,M0003页

作者： Baoming Zhao Yanfei Jian Zeyu Jiang Chi He Xi’an Modern Chemistry Research Institute Xi’an 710065ShaanxiChina State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Chemistry College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of SciencesBeijing 101408China

Pt/Eu2O3-CeO2 materials with different Eu concentrations were prepared and applied to toluene destruction,and the remarkable promotion impact of EuOx on Pt/CeO2 can be *** characterization results reveal that the presence of EuOx significantly enhances the redox property,lattice O concentration,and Ce3+ ratio of the Pt/CeO2 material,which facilitates the dispersion and activity of Pt active sites and thus accelerates the decomposition process of *** all catalysts,a sample with an Eu content of 2.5 at.%(Pt/EC-2.5)possesses the best catalytic activity with 0.09 vol% of toluene completely destructed at 200 ℃ under a relatively high GHSV of 50000 h^-*** possible reaction pathway and mechanism of toluene combustion over Pt/Eu2O3-CeO2 samples are presented according to in-situ DRIFTS,which confirms that the toluene oxidation process obeys the Mars-van Krevelen mechanism with aldehydes and ketones as primary organic intermediates.

关键词： Pt/Eu2O3-CeO2 material Promotion effect Toluene Catalytic oxidation In-situ DRIFTS Reaction mechanism

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Vapor condensation with low air mass fraction inside water seal branch tube under free convection

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Nuclear engineering and Design 2021年 379卷

作者： Bing Tan Xi Wang Y.W. Wu W.X. Tian S.Z. Qiu G.H. Su School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi an 710049 China School of Electric Power South China University of Technology Guangzhou 510640 China

The pressure vessel has used a newly designed water seal structure, and the sealed water is from condensation at low hydrogen concentration. To get the condensation capacity of the water seal branch tube under the pressure vessel normal operation, the experimental loop named WASETEL was constructed, which is aimed at studying the heat transfer during the process of air-steam mixture condensation inside the inclined branch tube at the condition of low air mass fraction. The inner tube is diameter 0.134 m with length 0.68 m which is connected with diameter 1.4 m, high 2.5 m pressure vessel. A canon camera was set to record the images and videos of the condensate height through glass tube in communicating vessel liquidometer. The experiment was conducted under the pressure ranged from 0.2 to 0.6 MPa, air mass concentration ranged from 0.49 to 6.42% and wall subcooling ranged from 11 to 40 K. The test showed HTC (heat transfer coefficient) would sharply deteriorate with the small air fraction, compared with pure steam condensation, about 0.49% mass fraction of the air will reduce heat transfer coefficient by 70–80%. When air concentration is relatively small, those widely used relations can not predict the condensation well, therefore, a new heat transfer empirical correlation with air mass fraction, pressure and subcooling is proposed, covered all the experimental data within the error band ±13%.

关键词： Natural condensation New empirical correlation Water seal

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Radiation Effects of 500 MeV Kr+ ions on NiO/β-Ga2O3 heterojunction diodes

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IEEE Transactions on Nuclear Science 2025年

作者： Zhao, Penghui Chen, Hao Zhou, Leidang Ma, Teng Chen, Liang Yang, Tao Lei, Zhifeng Lu, Xing Zhou, Genshu Guo, Hui Ouyang, Xiaoping School of Materials Science and Engineering Xi’an Jiaotong University Xi’an710049 China Xi’an Jiaotong University School of Microelectronics Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Xi’an Engineering Research Center of Advanced3D Vision Shaanxi Xi’an710000 China China Electronic Product Reliability and Environmental Testing Research Institute Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Guangzhou510610 China Northwest Institute of Nuclear Technology Radiation Detection Research Center Xi’an710024 China Xi’an Jiaotong University School of Instrument Science and Technology Xi’an710049 China Sun Yat-sen University State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Guangzhou510275 China Xidian University School of Microelectronics Shaanxi Xi’an710016 China

This study investigates the in-situ radiation effects on NiO/β-Ga2O3 heterojunction diodes (HJDs) under 500 MeV Kr+ ions irradiation, with a fluence of 1×108 cm-2 at -200 V. The statistical results show that both the forward conductive and reverse blocking characteristics of the HJDs were degraded after the irradiation of Kr+ ions. Associated with the analysis of current-voltage characteristics and the SRIM simulation results, the performance degradations were attributed to the vacancies induced by Kr+ ions radiation in the β-Ga2O3 material. On the one hand, the Kr+ radiation-induced vacancies reduced the net carrier concentration of the β-Ga2O3 and increased the generation-recombination current, leading to increased specific on-resistance and ideality factor of the irradiated HJDs. On the other hand, an oxygen di-vacancies-related trap, set at 1.07±0.01 eV below the conduction band, was involved after Kr+ ions radiation, which enhanced the Poole-Frenkel emission process, dominating the higher leakage current of the irradiated HJDs beyond -300 V. These results provide valuable insights into the radiation damage and performance degradation mechanisms in β-Ga2O3-based devices for space applications. © 1963-2012 IEEE.

关键词： Radiation damage

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Synthesis of AgI/Bi2MoO6 nano-heterostructure with enhanced visible-light photocatalytic property

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Progress in Natural Science:Materials International 2018年第2期28卷 235-241页

作者： Li Zhang Hongcheng Teng Jiancheng Zhou Yueming Sun Naixu Li Maochang Liu Dengwei Jing School of Chemistry and Chemical Engineering Southeast University Department of Chemical and Pharmaceutical Engineering Southeast University Chengxian College Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research Southeast University International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Suzhou Academy of Xi'an Jiaotong University

A novel nano-heterostructure of Ag I/Bi2MoO6photocatalyst was successfully synthesized via a facile depositionprecipitation method. The samples were systematically characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoemission spectroscopy, UV–Vis absorption spectroscopy, and photoluminescence spectra. While sole Bi2MoO6or Ag I showed poor activity toward photocatalytic rhodamine B degradation, the nano-heterostructure was found with superior performance. The AgI/Bi2MoO6composite with an optimal content of 20 wt% Ag I exhibited the highest photocatalytic degradation rate. Rhodamine B was totally degraded within 75 min visible-light irradiation. Moreover, the hybrid photocatalyst also showed a fairly good stability for several-cycle reuse. This study indicates that the AgI/Bi2MoO6nano-heterostructure can be used as an effective candidate for photocatalytic degradation of organic pollutants.

关键词： Heterostructure Photocatalyst RhB-degradation

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Cover Image, Volume 4, Number 1, January 2022

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Carbon Energy 2022年第1期4卷

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an China State Key Laboratory for Mechanical Behavior of Materials School of Material Science and Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power Sources Shanghai China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xiao-dong Yang College of Materials Science and Engineering Huaqiao University 361021 Xiamen China. Xiaohua Yang Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China. Yuping Wu State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University 211800 Nanjing China. College of Materials Science and Engineering Huaqiao University Xiamen China Institute of Quantum and Sustainable Technology (IQST) School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced Materials Nanjing Tech University Nanjing China

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Study on Combustion Characteristics of Coals in High Temperature Water Vapor Atmospheres

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2018年第12期52卷 84-92页

作者： Yao, Yashu Wen, Du Zhou, Qulan Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A scheme of adding high temperature water vapor to the combustion system to achieve low-nitrogen combustion is proposed to reduce NOx production during coal combustion, and its thermodynamic calculation and experimental research are carried out. Firstly, the possibility and limitation of the reactions in the volatile combustion process of coal after adding high temperature water vapor are examined by theoretical calculation based on the standard molar reaction Gibbs free energy change, the standard molar enthalpy and the equilibrium constant. Results of reaction path speculation show that in the high temperature water vapor atmosphere, the reactions of converting N element to N2 occur in the temperature range of coal combustion. Secondly, in reactions with various excess air coefficients, the equilibrium components after adding different concentrations of high temperature water vapor are calculated using the software HSC Chemistry. Results of the thermodynamic calculation show that the reaction of NOx precursor to N2 happens in a wide temperature range: when the temperature ranges from 700 to 800 and excess air coefficient lies between 0.6 and 0.8, the formation of NOx significantly reduces by adding high temperature water vapor;Reduction rate of NOx increases with the concentration of high temperature water vapor increasing. Eventually, the combustion characteristics of pulverized coal in water vapor and air atmosphere are tested in a pulverized coal fixed bed combustion experiment system. It shows that the formation of NOx is inhibited by adding high temperature water vapor and the effect is better that the result of the thermodynamic calculation, and the NOx reduction rate has a nonlinear relation with the water vapor concentration and the temperature. This study may provide an economical and efficient reference solution to low NOx combustion of coal. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

关键词： Coal combustion

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Mass Transfer and Kinetics of CO2 Absorption in Aqueous MDEA/DMSO Solutions

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第8期39卷 1763-1768页

作者： Luo, Qin-Lan Fang, Bin Qiang, Lei Li, Na Zhou, Qu-Lan State key laboratory of multiphase flow in power engineering Xi'an Jiaotong University Xi'an710049 China

In this study, the CO2 absorption rates in aqueous MDEA/DMSO solutions at various temperatures of 293.15 K, 303.15 K, 313.15 K and 323.15 K and concentrations varied from 0.5 mol/L to 6.6 mol/K were measured by using a laboratory wetted-wall column reactor with an immobile gas-liquid interface. A simplified kinetic model of gas-liquid absorption was developed, the mass transfer and dynamic parameters, such as the absorption rate constant, the overall reaction rate constant, the second-order reaction rate constant and the enhancement factor, were evaluated. The relationship between second-order reaction rate constant and the reaction temperature was obtained, the effect of solution concentration on the enhancement factor was also assessed, and the activation energy was estimated at a value of 20.38 kJ/mol. © 2018, Science Press. All right reserved.

关键词： Kinetics

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An efficient cellular flow model for cohesive particle flocculation in turbulence

arXiv

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arXiv 2020年

作者： Zhao, K. Vowinckel, Bernhard Hsu, T.-J. Köllner, T. Bai, B. Meiburg, E. Department of Mechanical Engineering UC Santa Barbara CA93106 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Leichtweiß-Institut für Wasserbau Technische Universität Braunschweig Braunschweig38106 Germany Center for Applied Coastal Research Department of Civil & Environmental Engineering University of Delaware NewarkDE19716 United States

We propose a one-way coupled model that tracks individual primary particles in a conceptually simple cellular flow setup to predict flocculation in turbulence. This computationally efficient model accounts for Stokes drag, lubrication, cohesive and direct contact forces on the primary spherical particles, and allows for a systematic simulation campaign that yields the transient mean floc size as a function of the governing dimensionless parameters. The simulations reproduce the growth of the cohesive flocs with time, and the emergence of a log-normal equilibrium distribution governed by the balance of aggregation and breakage. Flocculation proceeds most rapidly when the Stokes number of the primary particles is O(1). Results from this simple computational model are consistent with experimental observations, thus allowing us to propose a new analytical flocculation model that yields improved agreement with experimental data, especially during the transient stages. Copyright © 2020, The Authors. All rights reserved.

关键词： Turbulence

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Molecular sieving through a graphene nanopore： non-equilibrium molecular dynamics simulation

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Science Bulletin 2017年第8期62卷 554-562页

作者： Chengzhen Sun Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Two-dimensional graphene nanopores have shown great promise as ultra-permeable molecular sieves based on their size-sieving effects. We design a nitrogen/hydrogen modified graphene nanopore and conduct a transient non-equilibrium molecular dynamics simulation on its molecular sieving effects. The distinct time-varying molecular crossing numbers show that this special nanopore can efficiently sieve CO_2 and H_2S molecules from CH_4 molecules with high selectivity. By analyzing the molecular structure and pore functionalization-related molecular orientation and permeable zone in the nanopore, density distribution in the molecular adsorption layer on the graphene surface, as well as other features, the molecular sieving mechanisms of graphene nanopores are revealed. Finally, several implications on the design of highly-efficient graphene nanopores, especially for determining the porosity and chemical functionalization, as gas separation membranes are summarized based on the identified phenomena and mechanisms.

关键词： Graphene nanopore Molecular sieve Molecular dynamics Gas separation membrane

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The application of dual-mesh coupled heat transfer porous media model on the numerical simulation of a shell-tube heat exchanger

The application of dual-mesh coupled heat transfer porous me...

引用

International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting

作者： Song, Guangdong Yang, Qingchuan Qiu, Binbin Yang, Hongyi Yu, Huajin Liu, Mengmeng China Institute of Atomic Energy Beijing102413 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

It is an urgent demand to find an alternative model to replace the actual tube bundles area when using numerical simulation to study the Intermediate Heat Exchanger(IHX) of a Sodium-cooled Fast Reactor. An appropriate alternative model can be a substitute for the actual model of IHX in terms of heat transfer and fluid flow. Dual-mesh coupled heat transfer is used based on the porous media model in FLUENT to simulate the flow field of a simple shell-tube heat exchanger and get temperature, velocity and pressure field data of the primary and the secondary fluid simultaneously. The result meets well with that acquired from the calculation of an actual model which proves that the method in this paper is reliable and is able to reduce the modeling and meshing work. © 2018 International Topical Meeting on Advances in Thermal Hydraulics, ATH 2018 - Embedded Topical Meeting. All rights reserved.

关键词： Mesh generation

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