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Modulating the Electronic Metal-Support Interactions in Single-Atom Pt1−CuO Catalyst for Boosting Acetone Oxidation

Angewandte Chemie 2022年第28期134卷

作者： Dr. Zeyu Jiang Dr. Mingjiao Tian Dr. Meizan Jing Prof. Shouning Chai Dr. Yanfei Jian Dr. Changwei Chen Prof. Mark Douthwaite Dr. Lirong Zheng Dr. Mudi Ma Prof. Weiyu Song Prof. Jian Liu Prof. Jiaguo Yu Prof. Chi He State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi P. R. China Department of Chemistry National University of Singapore Singapore 117543 Singapore Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430074 P. R. China State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 P. R. China Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis School of Chemistry Cardiff University Cardiff CF10 3AT UK Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 P. R. China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing 101408 P. R. China

The development of highly active single-atom catalysts (SACs) and identifying their intrinsic active sites in oxidizing industrial hazardous hydrocarbons are challenging prospects. Tuning the electronic metal-support interactions (EMSIs) is valid for modulating the catalytic performance of SACs. We propose that the modulation of the EMSIs in a Pt 1 −CuO SAC significantly promotes the activity of the catalyst in acetone oxidation. The EMSIs promote charge redistribution through the unified Pt−O−Cu moieties, which modulates the d -band structure of atomic Pt sites, and strengthens the adsorption and activation of reactants. The positively charged Pt atoms are superior for activating acetone at low temperatures, and the stretched Cu−O bonds facilitate the activation of lattice oxygen atoms to participate in subsequent oxidation. We believe that this work will guide researchers to engineer efficient SACs for application in hydrocarbon oxidation reactions.

关键词： Acetone Oxidation Electronic Metal-Support Interactions Intrinsic Mechanism Single-Atom Catalysts

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Effect of proppant impingement on flow-induced corrosion of tubular steel super 13Cr via CFD and experiment

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Egyptian Journal of Petroleum 2018年第4期27卷 633-640页

作者： Cheng, J.R. Zhang, N.S. Cao, Y.P. Li, Z. Dou, Y.H. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an 710049 Shaanxi Province China Department of Petroleum Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China Department of Mechanical Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China

Data from a standard laboratory test including open-circuit potential (OCP) and current density monitoring is used to study the effect of fracturing proppant impingement on corrosion of tubular steel. A solid-liquid flow simulation is performed to obtain some parameters of particle movement and oxygen mass transfer near the metal surface. The results show that the electrochemical reaction includes passivation, activation and repassivation during a particle impact on the metal surface. Once the metal surface is in the activated state, the potential and anode current density is controlled by the oxygen concentration in the boundary layer and repassivation rate of metal surface. The increase of particle impact velocity accelerates the transmission of corrosion reactants and creates deeper impact craters on metal surface, resulting in the increase of current density. Meanwhile, the high speed particle impingement causes some platelets and extruding lips and thus weakens the surface corrosion resistance of stainless steel. © 2017

关键词： flow-induced corrosion Particle impingement Passive films Repassivation Tubular steel

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Current-Density Regulating Lithium Metal Directional Deposition for Long Cycle-Life Li Metal Batteries

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Angewandte Chemie 2021年第35期133卷

作者： Heng Mao Wei Yu Zhuanyun Cai Guixian Liu Limin Liu Rui Wen Yaqiong Su Huari Kou Kai Xi Benqiang Li Hongyang Zhao Xinyu Da Hu Wu Wei Yan Shujiang Ding Xi'an Key Laboratory of Sustainable Energy Materials Chemistry School of Chemistry Xi'an Jiaotong University & Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power Xi'an Jiaotong University Xi'an 710049 China Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Department of Mechanical Engineering University of Michigan-Dearborn Dearborn MI 48128 USA Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Uncontrolled dendrite formation in the high energy density of lithium (Li) metal batteries (LMBs) may pose serious safety risks. While numerous studies have attempted to protect separators, these proposed methods fail to effectively inhibit upward dendrite growth that punctures through the separator. Here, we introduce a novel “orientated-growth” strategy that transfers the main depositional interface to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (LCL-bottom). This layer works as a charge organizer that induces a high current density and encourages Li to deposit at the anode/current collector interface. Both in situ and ex situ images of the electrode demonstrate that the anode part of the cell has been flipped; with the newly deposited particles facing the current collector and the smooth surface facing the separator. The electrode in half and full cells showed outstanding cyclic stability and rate capability, with the LCL-bottom/LFP full cell capable of maintaining 94 % of its initial capacity after 1000 cycles.

关键词： anode/separator interface depositional interface transfer lithium metal battery long cycles

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Numerical Study on flow Field of a Diameter-varying Spray Tower for Amine-based CO2 Absorption 14

Numerical Study on Flow Field of a Diameter-varying Spray To...

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

作者： Wu, Xiaomei Yu, Yunsong Zhang, Zaoxiao Wang, Geoff Rudolph, Victor School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Chemical Engineering The University of Queensland St LuciaQLD4072 Australia

Our group proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the absorption performance of CO2 spray absorption process and some interesting results have been obtained. However, the detailed information (flow field distribution) inside the tower is hard to be obtained by experimental work. In this work, to specifically explain the performance inside the proposed diameter-varying spray tower, ANSYS Fluent17.2 software was used to simulate gas-liquid two-phase flow inside the proposed diameter-varying spray tower. Two different spray methods are discussed in this work. One is the dual-nozzle opposed impinging spray method proposed by our research group, the other is mostly literature discussed spray in the middle method. The flow field of continuous gas phase and dispersed liquid phase has been carefully discussed to illustrate the better spray method, which do more good to the CO2 absorption performance. © 2018 GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies. All rights reserved.

关键词： Carbon dioxide

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Experimental Study on Combustion Adjustment for Dense-dilute Burning through Swirling Burner with Variable Flaring Angle

Experimental Study on Combustion Adjustment for Dense-dilute...

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2018 3rd International Conference on Automation, Mechanical and Electrical engineering (AMEE 2018)

作者： Ya-fei ZHANG Rui LUO Yi-hua DOU Mechanical Engineering College Xi'an Shiyou University Thermal Power Research Institute State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A swirling burner with adjustable inner secondary air flaring angle is proposed and a laboratory-scale opposed-firing furnace is built. The effects of burner flaring angle on dense-dilute low-NO burning are experimentally studied. The temperature distributions along the depth and height direction of furnace are emphatically illustrated. NO emission and char burnout are compared and discussed. Experiment results indicate that under the dense-dilute burning conditions,variation of burner inner secondary air flaring promotes ignition conditions. Under different conditions of dense-dilute ratio, variation of burner flaring angle can help decreasing NO emission and improving char burnout. Finally the optimum flaring angle of swirling burner under different dense-dilute ratios is summarized in the form of curves, which could provide reference for exquisite and novel combustion adjustment.

关键词： Swirling burner Flaring angle Dense-dilute burning Coal combustion

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power-Grid Dispatching Method Considering Heat-power Coupling Characteristics of CHP Units

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IOP Conference Series: Earth and Environmental Science 2020年第3期440卷

作者： Sensen Guan Kun Wang E Zhijun Qingbo Hu Shan Wang Jiuwen Fang Rong Chen Fei Lu Bangyu Yang Ming Liu Tianjin Electric Power Science & Research Institute Tianjin 300384 State Grid Tianjin Electric Power Company Tianjin 300010 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Tianjin Guodian Jinneng Binhai Co-generation co. LTD 300459.

The dispatching optimization of power grid is to obtain the greatest benefits on the basis of safe and stable operation of the power grid, which is of great significance for the energy-saving, reliability of the power grid. Therefore, a multi-objective model of power grid dispatching which considers the heat-power coupling characteristics of CHP units is developed in this study. The economic benefit and minimum wind power abandonment are taken as optimizing targets in the model. Meanwhile, the detail operation characteristics of condensing power plants and CHP units are considered in this model based on off-design models of power plant. Besides, the regional heat load and power load are scheduled together. Finally, the AHP-entropy method is used to obtain the weights of the two optimizing targets of economic benefit and wind power abandonment, and the multi-objective is converted into a single-objective.

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New model for measuring stratified gas-liquid flow by Chisholm-model-based V-cone flowmeter

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Huagong Xuebao/CIESC Journal 2018年第8期69卷 3428-3435页

作者： He, Denghui Chen, Senlin Bai, Bofeng State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi’an University of Technology Xi'anShaanxi710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi'anShaanxi710049 China

Large errors are usually observed when Chisholm model is used in V-cone flowmeter to measure stratified gas-liquid flow rate. Three V-cone flowmeters with throttle ratios of 0.55, 0.65 and 0.75 were used to study stratified gas-liquid flowat gas volume fraction of more than 95%. The effects of gas and liquid flow rates, operating pressure and throttle ratio on correction factor C of the Chisholm model were analyzed and new modelfor measuring stratified gas-liquid flow was developed. Correction factor C was monotonically decreased with increase of Lockhart-Martinelli, XLM, but was hardly affected by pressure and the gas densiometric Froude number. However, C was somehow affected by throttle ratio. The relationship between C and XLM was obtained and new models for three V-cone flowmeters to measure stratified flow were developed. The relative standard error of the predicted gas flow rate was with ±3.0% for V-cone flowmeters with throttle ratios of 0.55 and 0.65 under confidence level of 94.6% and 88.6%, respectively, while that was with ±4.0% under 91.7% confidence level forV-cone flowmeter with throttle ratio of 0.75. © All Right Reserved.

关键词： Two phase flow

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Numerical Study of the Effect of Nozzle Configuration on Supersonic Condensation Jet

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第1期39卷 207-212页

作者： Zhou, Lun Liu, Jia Ma, Qiran Chong, Dao-Tong Liu, Ji-Ping Yan, Jun-Jie MOE key Laboratory of Thermal Fluid Science and Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Three-dimensional steady method was employed to simulate the condensation process of supersonic steam condensed into subcooled water pool by embedding the phase change model based on thermal equilibrium into Ansys platform. By comparing the shape of steam plume between numerical and experimental results, good agreements were observed. When steam pressure, water temperature and the diameter of nozzle throat were 300 kPa, 20℃ and 8 mm, the diameters of nozzle exit were set as 8.8, 9.6, 10.4 11.2 and 12.0 mm, respectively. The effect of nozzle pressure ratio on the shape of steam plume and the internal flow process was revealed. © 2018, Science Press. All right reserved.

关键词： Condensation

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Energy and exergy recovery from exhaust hot water using organic Rankine cycle and a retrofitted configuration

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Journal of Central South University 2018年第6期25卷 1464-1474页

作者： SUN Wen-qiang YUE Xiao-yu WANG Yan-hui CAI Jiu-ju Department of Thermal Engineering School of MetallurgyNortheastern UniversityShenyang 110819China State Environmental Protection Key Laboratory of Eco-Industry Northeastern UniversityShenyang 110819China State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong UniversityXi＇an 710049China ~ Central South University Press and Springer-Verlag GmbH Germanypart of Springer Nature 2018

Exhaust hot water （EHW） is widely used for various industrial processes. However, the excess heat carried by EHW is typically ignored and discharged into the environment, resulting in heat loss and heat pollution. An organic Rankine cycle （ORC） is an attractive technology to recycle heat from low-temperature energy carriers. Herein, ORC was used to recycle the heat carried by EHW. To investigate the energy and exergy recovery effects of EHW, a mathematical model was developed and a parametric study was conducted. The energy efficiency and exergy efficiency of the EHW-driven ORC system were modeled with R245fa, Rl13 and R123 as the working fluids. The results demonstrate that the EHW and evaporation temperatures have significant effects on the energy and exergy efficiencies of the EHW-driven ORC system. Under given EHW conditions, an optimum evaporation temperature exists corresponding to the highest exergy efficiency. To further use the low-temperature EHW, a configuration retrofitted to the ORC by combining with flash evaporation （FE） was conducted. For an EHW at 120 ~C and 0.2 MPa, the maximum exergy efficiency of the FE-ORC system is 45.91% at a flash pressure of 0.088 MPa. The FE-ORC performs better in exergy efficiency than the basic FE and basic EHW-driven ORC.

关键词： exhaust hot water （EHW） organic Rankine cycle （ORC） energy efficiency exergy efficiency flashevaporation （FE）

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Research on the effects of diluents and dilution ratios on laminar burning velocities and flame instabilities of hydrogen flame 11

Research on the effects of diluents and dilution ratios on l...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Lu, Xin Hu, Erjiang Li, Xiaotian Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Laminar burning velocities and flame instabilities of H2/O2/diluents mixture were studied at initial pressure of 0.3 MPa, initial temperature of 373 K and equivalence ratio of 1.0. The He diluted mixtures have the largest laminar burning velocities and the N2 diluted mixtures have the smallest, while He diluted mixtures have the largest mole fraction of H and OH radical and N2 diluted mixtures have the smallest. And laminar burning velocities fall when the dilution ratio rises, due to the mole fractions of H and OH radical fall with increasing dilution ratio. The cellular structure appeared on both N2 and Ar diluted mixture, while only wrinkles grew on He diluted mixtures. When dilution ratio rose, the appearance of cellular structure deferred. Thus, He diluted mixtures are more stable than N2 and Ar diluted mixtures, and higher dilution ratios restrain the flame instabilities. © 2017 Combustion Institute. All rights reserved.

关键词： Hydrogen

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