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Construction of Pd-M （M = Ni, Ag, Cu） alloy surfaces for catalytic applications

Nano Research 2018年第2期11卷 780-790页

作者： Xiang Li Xixi Wang Maochang Liu Hongyang Liu Qiang Chen Yadong Yin Mingshang Jin Frontier Institute of Science and Technology (FIST) School of Chemical Engineering and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing China Department of Chemistry University of California Riverside USA

The fabrication of ultrathin alloy shells as heterogeneous catalysts to increase the utilization efficiency and enhance the catalytic activity of metal atoms has been recognized as an effective method for the construction of efficient metal nanocatalysts, particularly noble-metal nanocatalysts. In this study, we demonstrate the successful formation of Pd-M （M = Ni, Ag, Cu） alloy shells with a tunable thickness on preformed nanoscale Pd seeds. The success of this synthesis mainly relies on the combination of the slow reduction of ＂M＂ ions and the subsequent diffusion of M ad-atoms into the surface lattice of Pd seeds. The composition of the Pd-M alloy shell is easily tuned by changing the type and amount of the added precursor, and the shell thickness is manipulated according to the reaction time. More significantl the surface structure of these alloy shells is maintained after the reaction, implying that any desired surface structure of Pd-M alloy shells can be prepared by using the appropriate starting materials. Further catalytic evaluation of the hydrogenation of chloronitrobenzenes shows that these alloy surfaces exhibit significantly improved selectivity compared to the Pd seeds. The Pd-Ni alloy surfaces exhibit much better catalytic selectivity （as high as 〉 99%） than Pd catalysts.

关键词： Pd allo3 catalyst shape control hydrogenation

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Retraction notice to “Exploration over combined impacts of modified piston bowl geometry and tert-butyl hydroquinone additive-included biodiesel/diesel blend on” [FUEL 322C (2002) 124206]

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Fuel 2025年 384卷

作者： Krupakaran Radhakrishnan Lawrence Zuohua Huang Xuan Phuong Nguyen Dhinesh Balasubramanian Vidyasagar Reddy Gangula Raghurami Reddy Doddipalli Van Vang Le Sachuthananthan Bharathy Anh Tuan Hoang Department of Mechanical Engineering Sree Vidyanikethan Engineering College Tirupati Andhra Pradesh India State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China PATET Research Group Ho Chi Minh City University of Transport Ho Chi Minh City Viet Nam Department of Mechanical Engineering Mepco Schlenk Engineering College Sivakasi India Mechanical Engineering Faculty of Engineering Khon Kaen University Khon Kaen Thailand Center for Alternative Energy Research and Development Khon Kaen University Khon Kaen Thailand Institute of Maritime Ho Chi Minh City University of Transport Ho Chi Minh City Viet Nam Institute of Engineering HUTECH University Ho Chi Minh City Viet Nam

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Front Cover: Decoupled Water Electrolysis Driven by 1 cm2Single Perovskite Solar Cell Yielding a Solar-to-Hydrogen Efficiency of 14.4 % (ChemSusChem 1/2023)

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ChemSusChem 2022年第1期16卷

作者： Fei Lv Dr. Zhixiao Qin Jiazhe Wu Lixia Pan Longjie Liu Prof. Yubin Chen Prof. Yixin Zhao International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 P. R. China School of Environmental Science and Engineering Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University Shanghai 200240 P. R. China

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Dynamics and energy harvesting of a flow-induced snapping sheet with nonuniform stiffness distribution

International Journal of Fluid Engineering

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International Journal of Fluid engineering 2024年第4期1卷 44-55页

作者： Zhaokun Wang Jingyu Cui Fuwang Zhao M.N.Mumtaz Qadri Yuanye Zhou Hui Tang Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina School of Fashion and Textiles The Hong Kong Polytechnic UniversityKowloonHong KongChina Zhejiang Key Laboratory of Multiphase Flow and Fluid Machinery Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Aerospace Engineering School of Mechanical and Manufacturing EngineeringNUSTIslamabad 44000Pakistan Shenzhen Research Institute of Shandong University A301 Virtual University Park in South District of ShenzhenShenzhenChina

Energy harvesting through periodic snap-through of a buckled sheet has recently gained considerable attention because of its potential applications in energy harvesting in low incoming *** the snapping dynamics of uniform buckled sheets has been extensively studied,the present work focuses on the energy harvesting and dynamics of a nonuniform snapping sheet with both of its ends clamped in a channel *** analysis reveals that the sheet undergoes periodic snap-through oscillations,with its rear half consistently serving as the main contributor to effective energy harvesting,and the potential energy contributing significantly more than the kinetic *** the stiffness differenceΔEI^(*)shows that increasing the stiffness of the rear part and decreasing that of the fore part shifts the deformation wave toward upstream and enhances the snapping amplitude of the fore part,optimizing energy *** a length compression ratioΔL^(*)=0.3,the maximum potential energy is observed forΔEI^(*)=1,and the total energy peaks atΔEI^(*)=*** study also identifies an optimalΔL^(*)=0.4that maximizes both total and potential energies,and triples the potential energy in comparison withΔL^(*)=***,the enhancement of nonuniformity disappears atΔL^(*)>0.3 for the total energy andΔL^(*)>0.2 for the potential *** findings provide insights to aid optimization of the design and performance of snapping sheet energy harvesters.

关键词： stiffness energy harvesting

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Novel Cu_3P/g-C_3N_4 p-n heterojunction photocatalysts for solar hydrogen generation

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Science China Materials 2018年第6期61卷 861-868页

作者： Zhixiao Qin Menglong Wang Rui Li Yubin Chen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Developing efficient heterostructured photocatalysts to accelerate charge separation and transfer is crucial to improving photocatalytic hydrogen generation using solar energy. Herein, we report for the first time that p-type copper phosphide（Cu3P） coupled with n-type graphitic carbon nitride（g-C3N4） forms a p-n junction to accelerate charge separation and transfer for enhanced photocatalytic *** optimized Cu3P/g-C3N4 p-n heterojunction photocatalyst exhibits 95 times higher activity than bare g-C3N4, with an apparent quantum efficiency of 2.6% at 420 nm. A detail analysis of the reaction mechanism by photoluminescence,surface photovoltaics and electrochemical measurements revealed that the improved photocatalytic activity can be ascribed to efficient separation of photo-induced charge carriers. This work demonstrates that p-n junction structure is a useful strategy for developing efficient heterostructured photocatalysts.

关键词： photocatalysis copper phosphide p-n junction heterostructure hydrogen production

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Abatement of Emissions of a Residential Wood Stove: Effect of the Catalyst on Gaseous and Condensable Pollutants Concentration and Their Toxicity

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ACS Omega 2025年第24期10卷 25506-25517页

作者： Marvin Laboureur Maxence Hannard Tarek Barakat Abhishek Goel Jordi Cornette Svend Bram Patricia Renard Thomas Duquesne Bao-Lian Su Laboratory of Inorganic Materials Chemistry (CMI) − Namur Institute of Structured Matter (NISM) University of Namur rue de Bruxelles 61 Namur 5000 Belgium；Stuv S.A. Rue Riverre 10-12 Floreffe 5150 Belgium Laboratory of Inorganic Materials Chemistry (CMI) − Namur Institute of Structured Matter (NISM) University of Namur rue de Bruxelles 61 Namur 5000 Belgium；Empa - Swiss Federal Laboratories for Materials Science and Technology Ueberlandstrasse 129 Dübendorf 8600 Switzerland Thermo and Fluid Dynamics (FLOW) Vrije Universiteit Brussel (VUB) Pleinlaan 2 Brussels 1050 Belgium；Brussels Institute for Thermal-fluid Systems and Clean Energy (BRITE) Vrije Universiteit Brussel (VUB) and Université Libre de Bruxelles (ULB) Brussels 1050 Belgium Thermo and Fluid Dynamics (FLOW) Vrije Universiteit Brussel (VUB) Pleinlaan 2 Brussels 1050 Belgium；Brussels Institute for Thermal-fluid Systems and Clean Energy (BRITE) Vrije Universiteit Brussel (VUB) and Université Libre de Bruxelles (ULB) Brussels 1050 Belgium；Faculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 Delft 2629 HS The Netherlands Laboratory of Biochemistry and Cell Biology (URBC)-Namur Research Institute for Life Sciences (NARILIS) University of Namur Rue de Bruxelles 61 Namur 5000 Belgium Stuv S.A. Rue Riverre 10-12 Floreffe 5150 Belgium Laboratory of Inorganic Materials Chemistry (CMI) − Namur Institute of Structured Matter (NISM) University of Namur rue de Bruxelles 61 Namur 5000 Belgium；State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Hongshan Luoshi Road Wuhan 430070 China

The use of biomass combustion for residential heating purposes is crucial for reaching the European Union’s 2050 climate-neutrality goals. It, however, raises environmental and health concerns. This study explores the impact of a patented catalyst on wood stove emissions and, notably, its influence on cytotoxicity by comparing flue gas composition with and without the catalyst. Organic gaseous compounds (OGC) generated by wood combustion comprise two subgroups: water-soluble condensable organic compounds (WSCOC) and high-saturating vapor organic compounds (HSVOC). The second is mainly composed of methane, a molecule challenging to oxidize into CO2at these operating temperatures. While the catalyst moderately eliminates OGC (19%) in general, it excels in removing CO (87%) and WSCOC (80%), particularly polycyclic aromatic hydrocarbons (PAH) (91%). Bioassays on the A549 human cell line show that the catalytic WSCOC removal is correlated with a significant decrease in cytotoxicity (50%). Additionally, particle number size distribution measurements suggest that the catalyst facilitates the deposition of particles larger than 10 μm, leading to a 66% reduction in the particulate mass concentration. These results underscore the catalyst’s role in mitigating harmful gaseous emissions and reducing the health risks associated with wood stove use, particularly by targeting toxic WSCOC.

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Elucidating Confinement and Microenvironment of Ru Clusters Stably Confined in MFI Zeolite for Efficient Propane Oxidation

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Angewandte Chemie 2024年第5期137卷

作者： Jingjing Wang Dr. Zeyu Jiang Hengyue Xu Prof. Xinzhe Li Dr. Yanfei Jian Dr. Lianghui Xia Dr. Pei Su Qiyuan Liu Prof. Shouning Chai Dr. Mudi Ma Dr. Abdallah Amedlous Dr. Mathias Barreau Prof. Zhengping Hao 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 Laboratoire Catalyse & Spectrochimie Normandie Univ ENSICAEN UNICAEN CNRS Caen 14000 France Department of Chemistry Tsinghua University Beijing 100084 P.R. China College of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 P.R. China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing 101408 P.R. China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430078 P.R. China

Achieving active and stable heterogeneous catalysts by encapsulating noble metal species within zeolites is highly promising for high utilization and cost efficiency in thermal and environmental catalytic reactions. Ru, considered an economical noble metal alternative with comparable performance, faces great challenges within MFI-type microporous zeolites due to its high cohesive energy and mobility. Herein, an innovative strategy was explored that couples hydrothermal in situ ligand protection with stepwise calcination in a flowing atmosphere to embed ultrasmall Ru clusters anchored at K + -healed silanol sites (≡Si−Ru δ+ −O−K complexes) within 10-membered ring sinusoidal channels of MFI. Comprehensive experiments and theoretical calculations unveiled that the interplay between confined Ru clusters and MFI induces local strain in MFI, creating a unique catalytic microenvironment around the Ru clusters. This synergy interaction enhances alkane deep oxidation as the confined Ru clusters and the MFI microenvironment collectively pre-activate C 3 H 8 and O 2 , facilitate the cleavage of C−H and C−C bonds at low temperatures. Notably, the stable geometric and electronic properties of the confined Ru show exceptional thermal stability up to 1000 °C, rivaling fresh catalysts. These findings shed vital methodological and mechanistic insights for developing efficacious heterogeneous catalysts for thermal catalysis.

关键词： heterogeneous catalysis microenvironment Ruthenium strain zeolite

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Theoretical evidence for new adsorption sites of CO2 on the Ag electrode surface

arXiv

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arXiv 2020年

作者： Guo, Shuai Li, Yao Liu, Lei Zhang, Xiangping Zhang, Suojiang CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Future Technology University of Chinese Academy of Sciences Beijing100049 China Dalian National Laboratory for Clean Energy Dalian116023 China

Nowadays, electrochemical reduction of CO2 has been considered as an effective method to solve the problem of global warming. The primary challenge in studying the mechanism is to determine the adsorption states of CO2, since complicated metal surfaces often result in many different adsorption sites. Based on the density functional theory (DFT) calculations, we performed a theoretical study on the adsorption of CO2 on the Ag electrode surface. The results show that the adsorption populations of CO2 are extremely sensitive to the adsorption sites. Importantly, we found that the preferable adsorption positions are the terrace sites, rather than the previous reported step sites. The adsorption populations were found with the order of (211) > (110) > (111) > (100). Subsequently, the adsorption characteristics were correlated with the d-band theory and the charge transfers between Ag surfaces and CO2. Copyright © 2020, The Authors. All rights reserved.

关键词： Density functional theory

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Modeling and optimizing of anode-supported solid oxide fuel cells with gradient anode: Part I. Model description and validation by experiments

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Numerical Heat Transfer, Part A: Applications 2019年第12期76卷 925-948页

作者： Pei Fu Xionghui Li Jian Chen Jian Yang Jianbing Huang Qiuwang Wang Key Laboratory of Thermo-Fluid Science and Engineering MOE School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi P.R. China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi P.R. China

Grading the porous anode microstructure, i.e., gradient anode is an effective way to enhance the electrical performance of anode-supported solid oxide fuel cells (SOFCs). This article is the first part of a two-part article which presents a 3D numerical model of a gradient anode SOFC and conducts a model validation in comparison with the experiments for the gradient anode SOFC modeling and optimizing. An experimental test setup was constructed first to evaluate the electrical performance of a SOFC button cell with a gradient anode. Then the microstructure characterization of each cell component was obtained by combining the mercury porosimetry with image analysis. Parameters relating to the microstructure mainly included the layer thickness, porosity, pore size, and particle size. Based on the microstructure parameters and measured electrical performances, the numerical model of the gradient anode SOFC button cell was established, which related the cell microstructure to the electrochemical characteristics. The results show that the microstructure parameters of each cell component can be quantificationally obtained by the backscatter electron image analysis. The modeledi-Vandi-Pcurves at three flow rates of fuel gas (75/100/125 mL·min−1) agree well with the experimental data. This validation process indicates that the numerical model is able to accurately describe the electrical performance of the gradient anode SOFC and it can be further extended to optimize the anode microstructure distribution.

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A study of a computational BVP for heat transfer and friction drag in magnetohydrodynamics viscous flow of a nanofluid subject to the curved surface

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Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical engineering 2021年

作者： Khan, M Riaz Saleel, C Ahamed Saeed, Tareq Allehiany, F.M. El-Refaey, Adel M Jing, Dengwei Mahmoud, Emad E LSEC and ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences China School of Mathematical Science University of Chinese Academy of Sciences China Department of Mechanical Engineering College of Engineering King Khalid University Saudi Arabia -Research Group Department of Mathematics Faculty of Science King Abdulaziz University Saudi Arabia Department of Mathematical Sciences College of Applied Sciences Umm Al-Qura University Saudi Arabia Department of Basic and Applied Science College of Engineering and Technology Arab Academy for Science Technology Maritime Transport Smart Village Campus Egypt State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China Department of Mathematics and Statistics College of Science Taif University Taif Saudi Arabia

The ongoing work investigates the features of Joule heating and convective condition over a magnetohydrodynamic stagnation point flow of (Formula presented.) nanofluid moving across a curved surface. Moreover, mass suction is supposed through the stretching/shrinking surface. The initially developed model of partial differential equations is transformed into the ordinary ones assisted by suitable similarity variables. Subsequently, the ultimate nonlinear model of ordinary differential equations is solved with the help of a built-in function bvp4c package in MATLAB. Several graphical results are plotted to see the influence of various dimensionless parameters over the velocity, temperature, heat transfer, and friction drag. We found that there exists an escalation in temperature with increasing values of curvature, Eckert number, Hartmann number, and Biot number;however, the velocity profile declines with large curvature, ratio parameter, and high concentration of nanoparticles. It is also important to note that the friction drag rises with the mass suction, and reduces with vast curvature, whereas the rate of heat transfer improves with suction and Biot number but lowers with Eckert number and Hartmann number. © IMechE 2021.

关键词： Magnetohydrodynamics

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