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The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 269-278页

作者： Yuexin Hou Xiaoyun Li Minghui Sun Chaofan Li Syed ul Hasnain Bakhtiar Kunhao Lei Shen Yu Zhao Wang Zhiyi Hu Lihua Chen Bao-Lian Su Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Material for Architectures Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 NamurBelgium Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Clare Hall University of CambridgeCambridgeCB39ALUK

Hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios(Hier-ZSM-5-x,where x=50,100,150 and 200)were synthesized using an ordered mesoporous carbon-silica composite as hard ***-ZSM-5-x exhibits improved mass transport properties,excellent mechanical and hydrothermal stability,and higher catalytic activity than commercial bulk zeolites in the benzyl alcohol self-etherification *** show that a decrease in the Si/Al ratio in hierarchical single-crystal ZSM-5 zeolites leads to a significant increase in the acidity and the density of micropores,which increases the final catalytic *** effect of porous hierarchy on the diffusion of active sites and the final catalytic activity was also studied by comparing the catalytic conversion after selectively designed poisoned acid *** poisoned Hier-ZSM-5-x shows much higher catalytic conversion than the poisoned commercial ZSM-5 zeolite,which indicates that the numerous intracrystalline mesopores significantly reduce the diffusion path of the reactant,leading to the faster diffusion inside the zeolite to contact with the acid sites in the micropores predominating in ZSM-5 *** study can be extended to develop a series of hierarchical single-crystal zeolites with expected catalytic performance.

关键词： hierarchical zeolites single crystalline interconnected pores improved diffusion performance benzyl alcohol self-etherification reaction

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Capacity Optimization of Hybrid Energy Storage System Based on Hysteresis Energy Management Strategy

Capacity Optimization of Hybrid Energy Storage System Based ...

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IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Wenlong Yang Minwang Wang Wenchao Zhu Changjun Xie Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China School of Automation Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (数字)9798350351156

ISBN: (纸本)9798350351163

This study improves the hydrogen energy module of the hydrogen-electric coupling system and proposes a hybrid hydrogen storage system structure based on Proton Exchange Membrane Electrolyzer (PEMEL), Alkaline Electrolyzer (ALKEL), and Proton Exchange Membrane Fuel Cell (PEMFC). Considering component startup and shutdown characteristics, dynamic operation, component degradation, and their impact on system reliability, a novel triple-hysteresis energy management strategy is proposed. The comprehensive optimization objectives include minimizing the Levelized Cost of Energy (LCOE), the Loss of Power Supply Probability (LPSP), and the Wind-Solar Curtailment to Load Energy Ratio (WSCLR). The optimal capacity configuration of the hybrid renewable energy system under the new energy management strategy was determined. The performance of the proposed strategy was analyzed and compared over short-term (1 year) and long-term (20 years) operations. The results indicate that the WSCLR of the ALKEL and PEMEL coupled structure is reduced by 83.3% compared to a single ALKEL system, and the LCOE and WSCLR are reduced by 2.1% and 3.5%, respectively, compared to a single PEMEL system. Compared to traditional energy management strategies, the new energy management strategy can reduce the LCOE, WSCLR, and LPSP by 2.7%, 45.0%, and 79.1%, respectively, over a 20-year long-term operation.

关键词： Protons Renewable energy sources System performance Hydrogen Lithium batteries Resource management Reliability Energy management Optimization Hysteresis

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High-temperature deformation behavior and processing map of the as-cast Inconel 625 alloy

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Rare Metals 2021年第8期40卷 2083-2091页

作者： Zhi Jia Ze-Xi Gao Jin-Jin Ji De-Xue Liu Ting-Biao Guo Yu-Tian Ding School of Material Science and Engineering Lanzhou University of TechnologyLanzhou730050China Key State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China School of Materials Engineering Lanzhou Institute of TechnologyLanzhou730050China

A short process of Inconel 625 alloy tube was developed to solve the problems of the traditional extrusion process,and particular attention was paid on the hot deformation behavior of the as-cast Inconel 625 *** hot compression experiments were performed to study the hot deformation behavior of Inconel 625 in the temperature range of 900-1200℃ and strain rate range of0.01-10.00 s^(-1) by *** hot compressed microstructure was examined to study the effects of temperature and strain rate on the microstructural characteristic by electron backscatter diffraction(EBSD).The results show that the processing maps were greatly influenced by the temperature rather than the strain *** is found that with the strain increasing,the instability zone gradually turned to the low-temperature and low strain rate area,while the range of high-temperature instability area *** optimum condition of the as-cast Inconel 625 alloy was determined as high strain rate region(temperature of1100-1200℃,strain rate of 1.00-10.00 s^(-1))with the dissipation efficiency of above *** illustrated by microstructural characteristic of EBSD analysis,the perfect dynamic recrystallization occurred and fine grain structure was obtained under this deformation conditions.

关键词： Inconel 625 Hot deformation behavior Constitutive equation Microstructure processing map

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Long-term Unsupervised Prediction of Proton Exchange Membrane Fuel Cells Considering Voltage Recovery

Long-term Unsupervised Prediction of Proton Exchange Membran...

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IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Jiarui Xue Wenchao Zhu Changjun Xie School of Automation Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China

ISBN: (数字)9798350351156

ISBN: (纸本)9798350351163

Predicting degradation behavior is both challenging and essential for the prognosis and health management of proton exchange membrane fuel cells (PEMFCs). This paper considers the voltage recovery phenomenon that occurs during the frequent start-stop cycles of PEMFCs and proposes a voltage recovery (VR) model to calculate and predict the value of voltage recovery. FC1 is used as a reference sample with fully known degradation, while FC2 is considered a cell in the degradation process. A Gate Recurrent Unit (GRU) neural network is employed to learn the mapping relationship between FC1 and FC2 and predict the state of health (SOH) of FC2. Finally, the prediction results from the VR model and the GRU neural network are combined to obtain the final prediction outcome. The proposed hybrid method effectively improves prediction performance by combining the local dynamic characteristics predicted by the VR model with the overall degradation trend predicted by the data-driven method, offering both improved accuracy and practical significance.

关键词： Degradation Protons Accuracy Neural networks Fuel cells Predictive models Market research Data models Power electronics Prognostics and health management

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Graded density impactor design via machine learning and numerical simulation: Achieve controllable stress and strain rate

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Defence technology 2025年

作者： Huang, Yahui Zhang, Ruizhi Liu, Shuaixiong Peng, Jian Liu, Yong Chen, Han Zhang, Jian Luo, Guoqiang Shen, Qiang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Nanostructure Research Centre State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang621900 China

The graded density impactor (GDI) dynamic loading technique is crucial for acquiring the dynamic physical property parameters of materials used in weapons. The accuracy and timeliness of GDI structural design are key to achieving controllable stress-strain rate loading. In this study, we have, for the first time, combined one-dimensional fluid computational software with machine learning methods. We first elucidated the mechanisms by which GDI structures control stress and strain rates. Subsequently, we constructed a machine learning model to create a structure-property response surface. The results show that altering the loading velocity and interlayer thickness has a pronounced regulatory effect on stress and strain rates. In contrast, the impedance distribution index and target thickness have less significant effects on stress regulation, although there is a matching relationship between target thickness and interlayer thickness. Compared with traditional design methods, the machine learning approach offers a 104–105 times increase in efficiency and the potential to achieve a global optimum, holding promise for guiding the design of GDI. © 2025 China Ordnance Society

关键词： Stress-strain curves

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Hetero-phase MoC-Mo_(2)C nanoparticles for enhanced photocatalytic H_(2)-production activity of TiO_(2)

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Nano Research 2021年第4期14卷 1095-1102页

作者： Jinfeng Liu Ping Wang Jiajie Fan Huogen Yu Jiaguo Yu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Hexagonal molybdenum carbide(Mo_(2)C)as an effective non-noble cocatalyst is intensively researched in the photocatalytic H_(2)-evolution field owing to its Pt-like H^(+)-adsorption ability and good ***,hexagonal Mo_(2)C-modified photocatalysts possess a limited H_(2)-evolution rate because of the weak H-desorption *** improve the activity,cubic MoC was introduced into Mo_(2)C toform the carbon-modified MoC-Mo_(2)C nanoparticles(MoC-Mo_(2)C@C)by a calcination *** resultant MoC-Mo_(2)C@C(ca.5 nm)was eventually coupled with Ti0_(2)to acquire high-efficiency Ti0_(2)/MoC-Mo_(2)C@C by electrostatic *** highest H_(2)-generation rate of Ti0_(2)/MoC-Mo_(2)C@C reached of 918μmol·h^(-1)·g^(-1)which was 91.8,2.7,and 1.5 times than that of the Ti0_(2),TiO_(2)/MoC@C,and Ti0_(2)/Mo_(2)C@C,*** enhanced rate of Ti0_(2)attributes to the carbon layer as cocatalyst to transmit electrons and the hetero-phase MoC-Mo_(2)C as H_(2)-generation active sites to boost H_(2)-evolution *** research offers a novel insight to design photocatalytic materials for energy applications.

关键词： TiO_(2) MoC-MO_(2)C@C cocatalyst H_(2)evolution photocatalysis

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Fabrication and Property of SiC Ceramic with Large Thickness/Diameter Ratios

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Journal of Wuhan University of technology(materials Science) 2020年第3期35卷 506-513页

作者： TAN Lin HE Qianglong HU Lanxin TIAN Tian WANG Weimin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Silicon carbide ceramics with different thicknesses/diameter ratios were prepared by using ultra-fine silicon carbide powder with the sintering additives of 1.0 wt% boron and 1.5 wt% carbon. The influence of thickness/diameter ratio on the microstructure and density of SiC ceramics was investigated in detail. The experimental results show that the addition of boron and carbon sintering aids can promote the densification process of SiC ceramic, leading to the low sintering temperature and improve mechanical properties. At 1950 ℃, SiC ceramic with a density of 99% exhibits Young's modulus, hardness, and flexural strength of 476 MPa, 28.3 GPa, and 334 MPa, respectively. It is found that long holding time has a positive effect on the uniformity of the microstructure and density distribution of SiC ceramics with large thickness/diameter ratios. Additionally, the sintering additive of boron can solid-solve into SiC, and then facilitate the phase transformation of SiC to form 6H-SiC and 4H-SiC composite ceramics.

关键词： SiC large thickness/diameter ratios mechanical properties uniformity

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Enhancing proton exchange membrane water electrolysis by building electron/proton pathways

Advanced Powder Materials

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advanced Powder materials 2024年第4期3卷 103-112页

作者： Liyan Zhu Hao Zhang Aojie Zhang Tian Tian Yuhan Shen Mingjuan Wu Neng Li Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies Foshan Xianhu LaboratoryFoshan 528200China Hubei Key Laboratory of Fuel Cell Wuhan 430070China

Proton exchange membrane water electrolysis(PEMWE)plays a critical role in practical hydrogen *** for the electrode activities,the widespread deployment of PEMWE is severely obstructed by the poor electron-proton permeability across the catalyst layer(CL)and the inefficient transport *** this work,the PEDOT:F(Poly(3,4-ethylenedioxythiophene):perfluorosulfonic acid)ionomers with mixed proton-electron conductor(MPEC)were fabricated,which allows for a homogeneous anodic CL structure and the construction of a highly efficient triple-phase *** PEDOT:F exhibits strong perfluorosulfonic acid(PFSA)side chain extensibility,enabling the formation of large hydrophilic ion clusters that form proton-electron transport channels within the CL networks,thus contributing to the surface reactant water *** PEMWE device employing membrane electrode assembly(MEA)prepared by PEDOT:F-2 demonstrates a competitive voltage of 1.713 V under a water-splitting current of 2 A cm^(-2)(1.746 V at 2A cm^(-2) for MEA prepared by Nafion D520),along with exceptional long-term ***,the MEA prepared by PEDOT:F-2 also exhibits lower ohmic resistance,which is reduced by 23.4%and 17.6%at 0.1 A cm^(-2) and 1.5 A cm^(-2),respectively,as compared to the MEA prepared by *** augmentation can be ascribed to the superior proton and electron conductivity inherent in PEDOT:F,coupled with its remarkable structural *** characteristic enables expeditious mass transfer during electrolytic reactions,thereby enhancing the performance of PEMWE devices.

关键词： Proton exchange membrane water electrolysis Oxygen evolution reaction Mixed proton-electron conductivity Triple-phase boundaries Membrane electrode assembly

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Spallation Damage Mechanisms and Microstructural Evolution in Selective Laser Melted Ti-6al-4v Under Quasi-Isentropic Loading

SSRN

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SSRN 2024年

作者： Zhang, Kaichang Li, Peibo Zhang, Yang Sun, Yi Luo, Guoqiang Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The microstructure of additively manufactured Ti-6Al-4V significantly differs from that of traditional casting processes, and this microstructural variation directly impacts the material's mechanical properties. To ensure the safety and stability of additively manufactured Ti-6Al-4V in practical applications, this study achieves controlled dynamic loading by optimizing the cross-sectional surface density of the structural gradient flyer(SGFs). It further explores material response characteristics under varying stress and strain rates by adjusting the loading rate in spallation experiments. The initial microstructure of Ti-6Al-4V produced via selective laser melting (SLM) was investigated and analyzed. Quasi-isentropic loading experiments were conducted on 6 mm thick samples at strain rates ranging from 5.07 to 12.38 × 104 s-1. The results demonstrate that, in comparison to as-cast alloys, the SLM-processed Ti-6Al-4V alloys exhibit reduced plasticity, primarily attributed to the higher cooling rates of SLM. The alloys predominantly display brittle fracture characteristics, with distinct transgranular fracture patterns. As the loading strain rate increases, the pulse width of the loading waveform progressively narrows, spall strength markedly rises, and cracks not only propagate but also enlarge. Grain refinement was evident in both the crack extension region and along the edges, accompanied by localized stress concentration, yet no signs of recrystallization were detected. The spall strength of the material exhibited heightened sensitivity to impact stresses relative to plate impact conditions. These findings offer critical theoretical insights into the potential applications of additively manufactured titanium alloys, particularly in aerospace and defense sectors. © 2024, The Authors. All rights reserved.

关键词： Grain refinement

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High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 356-362页

作者： GAO Jiancheng WANG Dangqiang LEI Liwen ZHANG Fan ZHANG Jinyong FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder *** fully dense (98.6%) materials were obtained at 1700℃ under a pressure of *** to the sintering temperature required to achieve similar results when a pressure of only 30MPa was applied,the sintering temperature was found to decrease by about 200℃ under pressure of 100 *** of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was ***,higher pressure resulted in remarkably improved mechanical properties of the composites,which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2.

关键词： hot-pressing high-pressure sintering densification TiB2-B4C

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