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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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Multi-objective optimization of methane production system from biomass through anaerobic digestion

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Chinese Journal of Chemical engineering 2018年第10期26卷 2084-2092页

作者： Weijun Li Jakob Kj?bsted Huusom Zhimao Zhou Yi Nie Yajing Xu Xiangping Zhang Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Sino-Danish Center for Education and Research University of Chinese Academy of Sciences Department of Chemical & Biochemical Engineering Technical University of Denmark

This work addressed the multi-objective optimization of a biogas production system considering both environmental and economic criteria. A mixed integer non-linear programming(MINLP) model was established and solved with non-dominated sorting genetic algorithm Ⅱ, from which the Pareto fronts, the optimal technology combinations and operation conditions were obtained and analyzed. It's found that the system is feasible in both environmental and economic considerations after optimization. The most expensive processing section is decarbonization; the most expensive equipment is anaerobic digester; the most power-consuming processing section is digestion, followed by decarbonization and waste management. The positive green degree value on the process is attributed to processing section of digestion and waste management. 3:1 chicken feces and corn straw, solar energy, pressure swing adsorption and 3:1 chicken feces and rice straw, solar energy, pressure swing adsorption are turned out to be two robust technology combinations under different prices of methane and electricity by sensitivity analysis. The optimization results provide support for optimal design and operation of biogas production system considering environmental and economic objectives.

关键词： Biogas production system MINLP Multi-objective optimization Non-dominated sorting genetic algorithm Ⅱ Green degree value

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Carbon-Confined Indium Oxides for Efficient Carbon Dioxide Reduction in a Solid-state Electrolyte flow Cell

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Angewandte Chemie 2022年第21期134卷

作者： Zhitong Wang Yansong Zhou Dongyu Liu Ruijuan Qi Chenfeng Xia Prof. Mingtao Li Prof. Bo You Prof. Bao Yu Xia School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Rd Wuhan 430074 China International Research Center for Renewable Energy (IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering (MFPE) Xi'an Jiaotong University (XJTU) 28 Xianning West Road Xi'an 710049 China HSE University 101000 Moscow Russia Key Laboratory of Polar Materials and Devices (MOE) Department of Electronics School of Physics and Electronic Science East China Normal University Shanghai 200241 China

Developing robust electrocatalysts and advanced devices is important for electrochemical carbon dioxide (CO 2 ) reduction toward the generation of valuable chemicals. We present herein a carbon-confined indium oxide electrocatalyst for stable and efficient CO 2 reduction. The reductive corrosion of oxidative indium to the metallic state during electrolysis could be prevented by carbon protection, and the applied carbon layer also optimizes the reaction intermediate adsorption, which enables both high selectivity and activity for CO 2 reduction. In a liquid-phase flow cell, the formate selectivity exceeds 90 % in a wide potential window from −0.8 V to −1.3 V vs. RHE. The continuous production of ca. 0.12 M pure formic acid solution is further demonstrated at a current density of 30 mA cm −2 in a solid-state electrolyte mediated reactor. This work provides significant concepts in the parallel development of electrocatalysts and devices for carbon-neutral technologies.

关键词： Carbon Dioxide Reduction Corrosion-Resistant Electrocatalyst Indium Oxide Solid-state Electrolyte

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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...

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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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Deciphering Ligand Controlled Structural Evolution of Prussian Blue Analogues and Their Electrochemical Activation during Alkaline Water Oxidation

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Angewandte Chemie 2022年第49期134卷

作者： Baghendra Singh Pandian Mannu Yu-Cheng Huang Ravi Prakash Shaohua Shen Chung-Li Dong Arindam Indra Department of Chemistry IIT(BHU) Varanasi UP-221005 India Department of Physics Tamkang University New Taipei City Taiwan School of Material Science and Technology IIT(BHU) Varanasi UP-221005 India International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi An Shi Xi'an 710049 China

Herein, we have demonstrated the control over the structure of precatalysts to tune the properties of the active catalysts and their water oxidation activity. The reaction of K 3 [Fe(CN) 6 ] and Na 2 [Fe(CN) 5 (NO)] with Co(OH) 2 @CC produced precatalysts PC-1 and PC-2, respectively, with distinct structural and electronic features. The replacement of the −CN group with strong π-acceptor −NO modulates the electronic and atomic structure of PC-2. As a result, a facile electrochemical transformation of PC-2 into active catalyst Fe−Co(OH) 2 -Co(O)OH (AC-2) has been attained only in 15 CV cycles while 600 CV cycles are required for the electrochemical activation of PC-1 into AC-1. The X-ray absorption studies reveal the contraction of the Co−O and Fe−O bond in AC-2 because of the presence of a higher amount of Co 3+ and Fe 3+ than in AC-1. The high valent Co 3+ and Fe 3+ modulates the electronic properties of AC-2 and assists in the O−O bond formation, leading to the improved water oxidation activity.

关键词： Electrochemical Reconstruction Oxygen Evolution Reaction Prussian Blue Analogue Ultrathin Nanosheets XAS Studies

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Upgrading of chromite by carbochlorination method using solid chlorinating agent and carbon 29

Upgrading of chromite by carbochlorination method using soli...

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29th International Mineral Processing Congress, IMPC 2018

作者： Han, Pei-Wei Qian, Peng Liu, Yong Ye, Shu-Feng Chu, Shao-Jun State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy China China Machinery International Engineering Design and Research Institute Co. Ltd. Changsha China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing China

ISBN: (纸本)9787030227119

Chromite with a low mass ratio of Cr to Fe (Cr/Fe ratio) was treated by the carbochlorination method using solid chlorinating agent (MgCl2 and CaCl2) and carbon in the present paper. The results showed that iron could be selective removed mainly in the form of FeCl2. The removal of iron was indirectly, which consisted of the decomposition of solid chlorinating agent to release Cl2/HCl and the carbochlorination of FeO•Cr2O3 by Cl2/HCl and C. The Cr/Fe ratio increased as increasing temperature from 700 ℃ to 900 ℃ in air atmosphere, while the tendency was opposite in N2 atmosphere. The removal efficiency of iron by CaCl2 was better than that by MgCl2. At last, a new pelletizing process was proposed to treat fine chromite with a low Cr/Fe ratio based on carbochlorination method, which could produce the high quality roasted chromite pellets with higher Cr/Fe ratio and compressive strength. © IMPC 2018 - 29th International Mineral Processing Congress. All rights reserved.

关键词： Chlorine compounds

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Life cycle assessment of a 1000 MW supercritical pulverized coal power plant under partial loads 31

Life cycle assessment of a 1000 MW supercritical pulverized ...

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31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2018

作者： Han, Xiaoqu Chen, Nana Karellas, Sotirios Liu, Ming Liu, Jiping Yan, Junjie Kakaras, Emmanuel State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens Athens Greece

ISBN: (纸本)9789729959646

With increasing share of renewable energy sources, pulverized coal (PC) power plants have to participate in peak load regulations frequently and operate in partial loads regularly. The energy efficiency and eco-efficiency are both affected significantly in this manner. Therefore, an overall concept for the estimation of environmental impacts from PC plants under nominal and partial loads should be established in life cycle assessment (LCA) methodology. In the present work, a 1000 MW supercritical coal-fired unit, which is the main force for power supply in China, was modeled using commercial simulation tools (GSE and SimaPro). The aim is to investigate the environmental impacts under different working conditions from the perspective of LCA. Moreover, a partial load feedwater heating system with ejector in a coal-fired power unit was proposed and investigated. Model validation and LCA analysis under nominal load show that GWP and PCOP are the main environmental impacts of PC plants. But AP and EP are also serious concerns. Under partial loads, the AP and EP increase significantly, resulted from the reduction in NOx removal efficiency. It is thereby concluded that the mechanisms of formation, migration, and removal of different kinds of pollutant emissions influence the LCA results significantly. Therefore, operation optimization was carried out based on the guidelines of the LCA framework, to reduce the environmental impacts of PC power plants under partial loads. It is indicated that through the integration of an ejector, the NOx removal efficiency at extremely low load (30%) can be maintained at a high level. The environment impact potentials can thus be reduced effectively. © 2018 University of Minho. All rights reserved.

关键词： Emission control

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Adsorption and Diffusion of Gas Molecules on Graphite Surface

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第1期39卷 110-113页

作者： Sun, Cheng-Zhen Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The adsorption and diffusion characteristics of gas molecules on graphite surface are investigated by molecular dynamics simulations. The results show that the adsorption intensity of gas molecules on graphite surface is related to the atomic interactions between gas molecules and carbon atoms in graphite;different gas molecules present distinct adsorption intensities on graphite surface. The adsorption characteristics can be described by the Langmuir isothermal adsorption model, where the molecular number density in the adsorption layer increases with increasing gas pressure. From the decreasing diffusion coefficients with increasing gas pressure and the normal probability distribution of molecular moving distance in a certain time period, it is concluded that the gas diffusion on graphite surface is mainly controlled by the molecular collisions and approaches the bulk diffusion phenomenon. Accordingly, the molecular number density in the adsorption layer has a great effect on the surface diffusion coefficients, resulting in the obviously lower diffusion coefficients of CO2 and H2S molecules with stronger adsorption intensities than those of CH4 and N2 molecules with weaker adsorption intensities. © 2018, Science Press. All right reserved.

关键词： Adsorption

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Three-dimensional pseudopotential lattice Boltzmann model for multiphase flows at high density ratio

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Physical Review E 2020年第5期102卷 053308-053308页

作者： Suchen Wu Yongping Chen Long-Qing Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing Jiangsu 210096 People's Republic China Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 USA Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou Jiangsu 215009 People's Republic China

In this study, we extend the pseudopotential lattice Boltzmann model proposed by Huang and Wu [J. Comput. Phys. 327, 121 (2016)] to a three-dimensional model for practical simulations of multiphase flows with high density ratio. In this model, an additional source term is introduced into the evolution function, and the performed high-order Chapman-Enskog analysis demonstrates that the Navier-Stokes equations with accurate pressure tensor are recovered. Also, an alternative geometric formulation is developed to obtain various contact angles and an iteration scheme is involved in the initialization to improve the stability of the model. Theoretical and numerical investigations both validate that the thermodynamic consistency and tuning surface tension independently of density ratio is achieved through varying the two free parameters in the source term. Numerical simulations of droplet wetting indicate that a large degree range of contact angles can be precisely realized with the implementation of the wetting boundary scheme. Further dynamic examinations of droplet impingement on a thin film and a dry surface also verify the stability and capability of the proposed pseudopotential lattice Boltzmann model.

关键词： multiphase flows Lattice-Boltzmann methods Navier-Stokes equation

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Decrypting the Controlled Product Selectivity over Ag−Cu Bimetallic Surface Alloys for Electrochemical CO2Reduction

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Angewandte Chemie 2023年第19期135卷

作者： Daixing Wei Yiqing Wang Prof. Chung-Li Dong Zhengqi Zhang Xinyu Wang Dr. Yu-Cheng Huang Yuchuan Shi Xiaoli Zhao Jialin Wang Prof. Ran Long Prof. Yujie Xiong Prof. Fan Dong Prof. Mingtao Li Prof. Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Physics Tamkang University New Taipei City 25137 Taiwan Hefei National Laboratory for Physical Sciences at the Microscale Frontiers Science Center for Planetary Exploration and Emerging Technologies School of Chemistry and Materials Science and National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China Research Center for Environmental and Energy Catalysis Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China

Electrochemical CO 2 reduction reaction (ECO 2 RR) with controlled product selectivity is realized on Ag−Cu bimetallic surface alloys, with high selectivity towards C2 hydrocarbons/alcohols (≈60 % faradaic efficiency, FE), C1 hydrocarbons/alcohols (≈41 % FE) and CO (≈74 % FE) achieved by tuning surface compositions and applied potentials. In situ spectral investigations and theoretical calculations reveal that surface-composition-dependent d-band center could tune *CO binding strengths, regulating the *CO subsequent reaction pathways and then the product selectivity. Further adjusting the applied potentials will alter the energy of participated electrons, which leads to controlled ECO 2 RR selectivity towards desired products. A predominant region map, with an indicator proposed to evaluate the thermodynamic predominance of the *CO subsequent reactions, is then provided as a reliable theoretical guidance for the controllable ECO 2 RR product selectivity over bimetallic alloys.

关键词： Alloys CO2 Reduction Controlled Product Selectivity Electrochemistry

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