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Solid-conversion synthesis of three-dimensionally ordered mesoporous ZSM-5 catalysts for the methanol-to-propylene reaction

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Frontiers of Chemical science and Engineering 2024年第8期18卷 111-122页

作者： Weilong Chun Chenbiao Yang Xu Wang Xin Yang Huiyong Chen School of Chemical Engineering Northwest UniversityXi’an 710069China International Science&Technology Cooperation Base for Clean Utilization of Hydrocarbon Resources Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei EnergyCollaborative Innovation Center for Development of Energy and Chemical Industry in Northern ShaanxiNorthwest UniversityXi’an 710069China

A facile synthesis of hierarchical ZSM-5 with the three-dimensionally ordered mesoporosity(3DOm ZSM-5)was achieved by solid conversion(SC)of SiO_(2)colloidal crystals to high-crystalline *** products of 3DZ5_S/C and 3DZ5_S,which were severally transformed from the carbon-padded SiO_(2)colloidal crystals and the initial SiO_(2)colloidal crystals,exhibited not only a similar ordered structure and acidity but also higher crystallinity and more balanced meso-/micropore combination in comparison with 3DZ5_C obtained by the conventional confined space crystallization *** three synthesized 3DZ5 catalysts showed improved methanol-to-propylene performance than the commercially microporous ZSM-5(CZ5),embodied in five times longer lifetime,higher propylene selectivity and S_(propylene)/S_(ethylene) ratio(P/E),and superior coke toleration with lower formation rate of coke(R_(coke)).Moreover,the 3DZ5_S catalyst in situ converted from SiO_(2)colloidal crystals presented the highest selectivities of propylene(42.51%)and light olefins(74.6%)among all three 3DZ5 *** high efficiency in synthesis and in situ utilization of SiO_(2)colloidal crystals demonstrate the proposed SC strategy to be more efficiently and eco-friendly for the high-yield production of not only 3DOm ZSM-5 but also other types of hierarchical zeolites.

关键词： hierarchical zeolite three-dimensionally ordered mesoporosity ZSM-5 solid conversion methanol-to-propylene

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A prediction model of microcirculation disorder in myocardium based on ultrasonic images

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Journal of Ambient Intelligence and Humanized Computing 2023年第6期14卷 7319-7330页

作者： Tian, Mingjun Zheng, Minjuan Qiu, Shi Song, Yang Department of Ultrasound Xijing Hospital Fourth Military Medical University Xi’an710032 China Key Laboratory of Spectral Imaging Technology CAS Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an China High Technology Research and Development Center of the Ministry of Science and Technology Beijing China

The primary cause of coronary heart disease is abnormal myocardial circulatory perfusion. Microcirculation is the key link of myocardial oxygen supply and plays a major role in myocardial blood supply. We intended to employ myocardial load contrast enhanced ultrasound (MCSE) coupled with artificial intelligence to accurately evaluate the microcirculation of patients. (1) Based on the convolutional neural network, the framework of myocardial vessel extraction was constructed to extract myocardial vessels and accurately monitor the myocardium. (2) From the perspective of visual perception, the salient region algorithm was proposed to identify the perfusion signals according to the texture features and grayscale features, and the quantitative indexes of myocardial perfusion were obtained. (3) Combined with the imaging features and clinical features, the early diagnosis, efficacy evaluation, and risk stratification of coronary heart disease microcirculation disorders were evaluated. The results of this study lead to effectively evaluating and predicting myocardial microcirculation with AOM reaching 84% and the algorithm can aid medical professionals in diagnosis and therapy. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Cryptography

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Defect Engineering Strategy for Superior Integration of Metal-Organic Framework and Halide Perovskite as a Fluorescence Sensing Material

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ACS Applied Materials and Interfaces 2024年第24期16卷 31023-31035页

作者： Lai, Zhun-Xian Muchlis, Andi Magattang Gafur Devi, Ramadhass Keerthika Chiang, Chen-Lung Syu, Yi-Ting Tsai, Yi-Ting Lee, Cuo-Chi Lin, Chun Che Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei106334 Taiwan Research and Development Center for Smart Textile Technology National Taipei University of Technology Taipei106334 Taiwan Department of Agricultural Science and Technology Ministry of Agriculture Taipei100 Taiwan Department of Biomedical Science Chang Gung University Taoyuan City33302 Taiwan

Combining halide perovskite quantum dots (QDs) and metal-organic frameworks (MOFs) material is challenging when the QDs’ size is larger than the MOFs’ nanopores. Here, we adopted a simple defect engineering approach to increase the size of zeolitic imidazolate framework 90 (ZIF-90)’s pores size to better load CH3NH3PbBr3 perovskite QDs. This defect structure effect can be easily achieved by adjusting the metal-to-ligand ratio throughout the ZIF-90 synthesis process. The QDs are then grown in the defective structure, resulting in a hybrid ZIF-90-perovskite (ZP) composite. The QDs in ZP composites occupied the gap of 10-18 nm defective ZIF-90 crystal and interestingly isolated the QDs with high stability in aqueous solution. We also investigated the relationship between defect engineering and fluorescence sensing, finding that the aqueous Cu2+ ion concentration was directly correlated to defective ZIF-90 and ZP composites. We also found that the role of the O-Cu coordination bonds and CH3NHCu+ species formation in the materials when they reacted with Cu2+ was responsible for this relationship. Finally, this strategy was successful in developing Cu2+ ion fluorescence sensing in water with better selectivity and sensitivity. © 2024 The Authors. Published by American Chemical Society.

关键词： Defect engineering

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NiMo-MMO catalyst derived from LDHs precursors toward the deep hydrogenation of pyrene

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Chinese Journal of Chemical Engineering 2024年第12期76卷 201-210页

作者： Yongliang Jia Boyang Bai Jing Wang Yueyi Wang Zheng Wang Xiaoxun Ma School of Chemical Engineering Northwest UniversityXi'an 710069China International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources Xi'an 710069China Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi'an 710069China Shaanxi Research Center of Engineering Technology for Clean Coal Conversion Xi'an 710069China Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi Xi'an 710069China College of Chemistry and Materials Science Weinan Normal UniversityWeinan 714000China

A series of Ni-based catalysts were prepared via structural topological transformation from the Ni@Al_(2)O_(3)layered double hydroxides(LDHs)precursors,and applied for the deep catalytic hydrogenation saturation of pyrene in a high-pressure *** pore structures,active species dispersion,surface morphology,amount and type of acid of the prepared catalysts were characterized by BET,XRD,SEM,TEM,XPS,SEM,NH_(3)-TPD and *** studied the influence of physicochemical properties of Ni-based catalysts on the regularity and mechanism of deep hydrogenation of ***,the synergy between Ni and Mo,and the interaction between active metals and support were discussed to further reveal the constitutive relationship during the hydrogenation reaction of *** results of the evaluation of the catalytic hydrogenation of pyrene show that the as-prepared NiMo mixed metal oxide(MMO)catalyst showed excellent catalytic activity:~95%pyrene conversion,90.12%for the selectivity of deep hydrogenation products(hexahydropyrene,decahydropyrene and hexadecahydropyrene).It was expected that the successfully preparation and utilization of NiMo-MMO catalyst could provide a theoretical basis for the design of this kind of catalysts for deep catalytic hydrogenation of polycyclic aromatic hydrocarbons(PAHs).

关键词： Ni@Al_(2)O_(3)LDHs Structural topological transformation method NiMo-MMO catalyst Pyrene deep hydrogenation

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Early Opportunities for Onshore and Offshore CCUS Deployment in the Chinese Cement Industry

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Engineering 2025年第3期46卷 348-362页

作者： Jing-Li Fan Yifan Mao Kai Li Xian Zhang Center for Sustainable Development and Energy Policy Research(SDEP) School of Energy and Mining EngineeringChina University of Mining and TechnologyBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyBeijing 100083China The Administrative Centre for China’s Agenda 21(ACCA21) Ministry of Science and Technology(MOST)Beijing 100038China

The promotion of deep decarbonization in the cement industry is crucial for mitigating global climate change,a key component of which is carbon capture,utilization,and storage(CCUS)*** its importance,there is a lack of empirical assessments of early opportunities for CCUS implementation in the cement *** this study,a comprehensive onshore and offshore source–sink matching optimization assessment framework for CCUS retrofitting in the cement industry,called the SSM-Cement framework,is *** framework comprises four main modules:the cement plant suitability screening module,the storage site assessment module,the source–sink matching optimization model module,and the economic assessment *** applying this framework to China,919 candidates are initially screened from 1132 existing cement ***,603 CCUS-ready cement plants are identified,and are found to achieve a cumulative emission reduction of 18.5 Gt CO_(2) from 2030 to 2060 by meeting the CCUS feasibility conditions for constructing both onshore and offshore CO_(2) transportation *** levelized cost of cement(LCOC)is found to range from 30 to 96(mean 73)USD·(t cement)^(-1),while the levelized carbon avoidance cost(LCAC)ranges from^(-5) to 140(mean 88)USD·(t CO_(2))^(-1).The northeastern and northwestern regions of China are considered priority areas for CCUS implementation,with the LCAC concentrated in the range of 35 to 70 USD·(t CO_(2))^(-1).In addition to onshore storage of 15.8 Gt CO_(2) from 2030 to 2060,offshore storage would contribute 2.7 Gt of decarbonization for coastal cement plants,with comparable LCACs around 90 USD·(t CO_(2))^(-1).

关键词： Cement industry Carbon capture,utilization,and storage Levelized cost of cement Source-sink matching Offshore storage continental shale oil

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Influence of ultrasonic agitation on dispersion of fibers in a shell mold for investment casting

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China Foundry 2025年

作者： Zhi-cheng Feng Kai Lü Yan Lu Wen-bo Jin Lei Che School of Materials Science and Engineering Inner Mongolia University of Technology Engineering Research Center of Development and Processing Protection of Advanced Light Metals Ministry of Education The Inner Mongolia Advanced Materials Engineering Technology Research Center

To develop a suitable production process for fiber reinforced investment casting shell mold,three methods were studied:the traditional method （M1）,the method of adding fiber into silica sol with mechanical stirring and ultrasonic agitation （M2）,and the method of adding fiber into slurry with mechanical stirring and ultrasonic agitation for durations of 3,15,30,and 45 min （M3）.The bending strength,high-temperature self-load deformation,and thermal conductivity of the shell molds were *** results reveal that the enhancement of fiber dispersion through ultrasonic agitation improves the comprehensive performance of the shell *** maximum green bending strength of the shell mold by M2reaches 3.29 MPa,which is 29%higher than that of the shell mold prepared by ***,the high-temperature self-load deformation of the shell mold is reduced from 0.62%to 0.44%.In addition,simultaneous ultrasonic agitation and mechanical stirring effectively shorten the slurry preparation time while maintaining comparable levels of fiber *** the process M3-45 min,the fillers are uniformly dispersed in the slurry,and the fired bending strength and the high-temperature self-load deformation reach 6.25 MPa and 0.41%,***,the proposed ultrasonic agitation route is promising for the fabrication of fiber-reinforced shell molds with excellent fibers dispersion.

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Piezoelectric-enhanced BiOBr/UiO-66-NH_(2)(Hf)photocatalysts for purification of mixed pollutants

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science China(Technological sciences) 2025年第5期68卷 87-101页

作者： Tingting YU Chenyu YANG Ran DENG Yonghang ZHANG Jiajun LI Tao YANG Jizhou JIANG School of Environmental and Chemical Engineering Jiangsu Ocean UniversityLianyungang 222005China School of Materials Science and Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China

The simultaneous purification of multiple mixed pollutants holds significant practical value in addressing the growing environmental challenges of *** this work,UiO-66-NH_(2)(Hf)octahedrons were successfully synthesized and grown on BiOBr nanosheets to form a novel heterojunction,BiOBr/UiO-66-NH_(2)(Hf).This BiOBr/UiO-66-NH_(2)(Hf)heterojunction exhibits enhanced photocatalytic degradation and reduction ***,the degradation rate of tetracycline hydrochloride(TC)reached 84.8%,while the reduction efficiency of Cr(VI)approached 100%,demonstrating the material’s effectiveness in simultaneously purifying mixed ***,when ultrasonic force was applied,the degradation rate of TC increased from 57.1%to 84.8%,and the reduction rate of Cr(VI)improved from 73.5%to 100%.These results highlight the material’s excellent piezoelectric properties,which were confirmed through density functional theory calculations and piezoresponse force *** work introduces a novel piezoelectric-coupled photocatalyst that offers a new strategy for the efficient purification of mixed ***,it demonstrates that TC can promote the reduction of Cr(VI)in place of hole quenchers,while simultaneously undergoing *** approach reveals promising prospects for the effective removal of mixed pollutants.

关键词： piezoelectric effect tetracycline hydrochloride photocatalytic degradation Cr(VI)reduction mixed pollutant purification

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Improved thermal stability of nanostructured surface on Al 6082 alloy by (Zr+Yb) addition

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Emerging Materials research 2025年第1期14卷 39-51页

作者： Hu, Wen-Ru Meng, Xiang-Quan Zhang, Lei Sun, Jian Yang, Xue Du, Xiao-Dong Department of Materials Science and Engineering Hefei University of Technology Hefei China Wuhan Ruimin Science & Technology Co. Ltd China Railway Science & Industry Group Co. Ltd Wuhan China Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of Education Hefei University of Technology Hefei China Anhui Jinsheng Automobile Industry Limited Company Xuancheng China Education Center of Engineering Quality Hefei University of Technology Hefei China

Aluminum alloy 6082 (AA6082) is widely used in the production of industrial structural parts due to its light weight and good mechanical properties. However, such structural components are often accompanied by peripheral coarse grain defects and poor surface hardness and wear resistance. A nanostructured surface layer was developed on AA6082 through surface mechanical attrition treatment (SMAT) to improve the surface properties. Thermal stability and other features of nanostructured surface layer were investigated after annealing from 1508C to 3508C. The experiment results showed that the thermal stability for the surface nanostructure layer on AA6082 without containing (Zr+Yb) was at 3008C, while the composite addition of (Zr+Yb) improved the thermal stability for the surface nanostructure layer on AA6082 by 508C and stabilized at 3508C. We found that the high thermal stability of surface nanostructure layer on AA6082 containing (Zr+Yb) was due to the pinning effect of the (Zr+Yb)-containing precipitates on the grain boundaries. The main objective of this study is to improve the surface performance of AA6082 by SMAT and to investigate a way to enhance the thermal stability of the surface nanostructure in order to qualify the material for various temperature service conditions. © 2025 Emerald Publishing Limited: All rights reserved.

关键词： Grain boundaries

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Self-healing of active site in Co(OH)_(2)/MXene electrocatalysts for hydrazine oxidation

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Journal of Materials science & technology 2024年第36期203卷 108-117页

作者： Kun Xiang Yongjing Wang Zechao Zhuang Jing Zou Neng Li Dingsheng Wang Tianyou Zhai Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The development of efficient hydrazine oxidation reaction(HzOR)catalysts is important for the construc-tion of remarkable energy storage and conversion ***,after a period of electrochemical reaction,the active site of the catalyst will be irreversibly reduced or inactivated,and how to recover the active site is a major ***,we report 2D Co(OH)_(2)/Ti_(3)C_(2)(OH)_(x)MXene composites with rapid re-construction and self-healing behaviors as efficient and stable electrocatalysts during HzOR *** experimental and theoretical results indicate that the introduction of Ti_(3)C_(2)(OH)_(x)MXene can effectively reduce the dehydrogenation barrier of Co(OH)_(2),from 0.584 eV to 0.481 eV to form the real catalytic active center Co(OH)***,Co(OH)O/Ti_(3)C_(2)(OH)_(x)MXene composites with metal-like conductiv-ity not only present spontaneous adsorption capacity of N_(2)H_(4),but also can modulated rate-determining step of dehydrogenation of∗N_(2)H_(4)to∗N_(2)H_(3)(0.54 eV)compared with Co(OH)***,the electrophilic oxygen of Co(OH)O/Ti_(3)C_(2)(OH)_(x)can spontaneously obtain electrons and protons from N_(2)H_(4),achieving the oxidation of N_(2)H_(4)while reducing Co(OH)O to Co(OH)_(2),thus completing the self-healing of the efficient catalyst.

关键词： Hydrazine oxidation Self-healing Reconstruction Co(OH)_(2)/MXene Electrocatalysis

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Superconductivity in Cubic La_(3)Al with Interstitial Anionic Electrons

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Chinese Physics Letters 2025年第2期42卷 88-97页

作者： Zhijun Tu Peihan Sun Donghan Jia Huiyang Gou Kai Liu Hechang Lei School of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Center for High Pressure Science and Technology Advanced Research Beijing 100193China

We observed superconductivity in a cubic La_(3)Al single crystal that exhibits metallic behavior in the normal state without an observable structural transition and enters the superconducting state below T_(c)~6.32 *** characterization and analysis indicate that cubic La_(3)Al is a bulk type-Ⅱ BCS ***,theoretical calculations show that it can host interstitial anionic electrons located at the body center of the cubic unit cell,which confirms electron-phonon coupling as the superconducting ***,cubic La_(3)Al can be considered as a novel electride superconductor.

关键词： mechanism cubic

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