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Heterojunctioned CuO/Cu_(2)O catalyst for highly efficient ozone removal

Journal of Environmental Sciences 2023年第3期125卷 340-348页

作者： Guojun Ma Wenxiang Tang AnqiWang Le Zhang Jian Guan Ning Han Yunfa Chen Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering Sichuan UniversityChengdu 610065China

In recent years, near surface ozone pollution, has attracted more and more attention,which necessitates the development of high efficient and low cost catalysts. In this work,Cu O/Cu_(2)O heterojunctioned catalyst is fabricated by heating Cu_(2)O at high temperature, and is adopted as ozone decomposition catalyst. The results show that after Cu_(2)O is heated at180℃conversion of ozone increases from 75.2% to 89.3% at mass space velocity 1,920,000cm^(3)/(g·hr) in dry air with 1000 ppm V ozone, which indicates that this heterojunction catalyst is one of the most efficient catalysts reported at present. Catalysts are characterized by electron paramagnetic resonance spectroscopy and ultraviolet photoelectron spectroscopy,which confirmed that the heterojunction promotes the electron transfer in the catalytic process and creates more defects and oxygen vacancies in the Cu O/Cu_(2)O interfaces. This procedure of manufacturing heterostructures would also be applicable to other metal oxide catalysts, and it is expected to be more widely applied to the synthesis of high-efficiency heterostructured catalysts in the future.

关键词： Cu_(2)O Ozone decomposition CuO Heterojunction

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Dynamic apertures with diffusion-regulatory functionality in soft porous crystals:A key to solving the century puzzle on isotopologues separation

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Nano Research 2023年第2期16卷 3254-3255页

作者： Yanhong Li Jianze Xiao Yangyang Guo Ning Han Fangli Yuan Yunfa Chen Ming-Shui Yao State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100049China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The separation of water isotopologues has been a“century-old”challenge,also known as“the Holy Grail”in separation *** water(D2O)is a stable non-radioactive water isotopologue that plays a critical role in scientific research,military,nuclear energy,and medical *** water was first reported in 1931 when *** discovered D2 and D2O,for which he was awarded the Nobel Prize in Chemistry in *** in 1933,*** et *** 0.5μL of heavy water at a concentration of around 65.7%when electrolyzing 10 liters of *** 1935,the world's first heavy water plant was built in Norway,producing 2 tons of heavy water by electrolysis,but the separation factor was merely 1.05,which was extremely *** 1943,the first heavy water plant employing the distillation method was built in the United States.

关键词： separation porous distillation

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Smart heat isolator with hollow multishelled structures

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Green Energy & Environment 2023年第4期8卷 1154-1160页

作者： Kun Wang Lekai Xu Jiao Wang Shaojun Zhang Yanlei Wang Nailiang Yang Jiang Du Dan Wang Henan Province Industrial Technology Research Institute of Resources and Materials Zhengzhou UniversityZhengzhou450001China State Key Laboratory of Biochemical Engineering Key Laboratory of Science and Technology on Particle MaterialsInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou450000China University of Chinese Academy of Sciences 19A Yuquan RoadBeijing100049China Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process EngineeringChinese Academy of SciencesBeijing100190China

Safe, green and efficient industrial production has always been the pursuit of the chemical industry. Since thermal energy is the driving force for most of chemical reactions, an ideal reaction tank would have the capacity to automatically regulate heat conduction rate. In detail, this reaction tank should endow an ability that resists the heat loss when the reaction temperature is lower than the target, while accelerating the heat dissipation when the system is overheated. In this case, this smart reactor can not only minimize energy consumption but also reduce safety *** structures are known to reduce heat conductivity. Particularly, the hollow structure with multishells can provide more interfaces and thus further inhibit heat transmission, which would be more favorable for heat isolation. Step forward, by coupling HoMSs with temperature-sensitive polymer, a smart heat isolation material has been fabricated in this work. It performs as a good heat isolator at a relatively lower temperature. A heat insulation effect of 6.5℃ can be achieved for the TSPU/3S–TiO_(2)HoMSs with a thickness of 1 mm under the temperature field of 50℃.The thermal conductivity of composite material would be raised under overheating conditions. Furthermore, this composite displays an unusual two-stage phase transformation during heating. Benefiting from the unique multishelled structure, energy is found to be gradually guided into the hollow structure and stored inside. This localized heat accumulation enables the composite to be a potential coating material for intelligent thermal-regulator and site-defined micro-reactor.

关键词： Hollow multishelled structures Thermal insulation Smart material

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Predicting product properties of fluidized bed spray granulation using CFD-DEM simulations 13

Predicting product properties of fluidized bed spray granula...

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13th International Conference on Fluidized Bed technology, CFB 2021

作者： Kieckhefen, Paul Pietsch, Swantje Heinrich, Stefan Institute of Solids Process Engineering and Particle Technology Denickestrasse 15 Hamburg21073 Germany

ISBN: (纸本)9781771368506

CFD-DEM is the most promising way of describing the micro- and meso-scale behavior of fluidized beds. In particular, the interaction of single particles with both flow and other particles, as well as liquid droplets can be resolved, while preserving their individual fate. Fluidized bed spray granulation is the preferred way of generating functional, high value granular products. By injecting a solution or suspension onto a particle bed, the particles grow layer by layer. Here, the drying conditions have a major influence on the structure of the layers, due to the pre-concentration of droplets that cause changes in the viscosity and velocity of impinging droplets. This affects the spreading behavior of droplets on the surface, together with the crystallization occurring within the droplets themselves in the case of solutions, resulting in either porous or dense layers. As these phenomena are well accessible in CFD-DEM simulations, their combination can be a powerful tool in the design of granulators that produce tailor-made particles. In this work, a compressible CFD-DEM solver, capable of modelling heat transfer, spray injection and evaporation, is presented and validated against experimental data. A simple concept for tracking the progress of the structure-determining processes taking place within the droplets and on the surface of the wetted particles is presented. Calibration granulation experiments from literature were recreated in simulations and used to correlate between resulting shell porosity and micro-scale event timescales. © 2021 CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed technology. All rights reserved.

关键词： Drops

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Three-Dimensional Measurement of Binary particle Collisions Under Dry and Wet Conditions

SSRN

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SSRN 2023年

作者： Bunke, Falk Pietsch-Braune, Swantje Heinrich, Stefan Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology Denickestraße 15 Hamburg21073 Germany

The description, calculation and design of solids processes, such as fluidization, pneumatic conveying or mixing, require knowledge of collision dynamics between particles and apparatus walls or interparticle collisions without, but often also with the presence of an additional liquid. For the study of such dry and wet interparticle collisions, an experimental setup is presented that allows the performance of dry or wet free binary collisions of spherical particles down to a minimum diameter of 1 mm and the recording of the particle motions in all three spatial directions by two synchronized highspeed cameras. Methods and algorithms are presented for analyzing the translational and rotational motion in three-dimensional space, as well as for measuring the amount of fluid on the particles in the case of wet collisions. In addition, motion data from dry collisions between equal sized and unequal sized particles are compared with a three-parameter collision model. © 2023, The Authors. All rights reserved.

关键词： Fluidization

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Influence of process parameters on the granule morphology during fluidized bed spray granulation 13

Influence of process parameters on the granule morphology du...

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13th International Conference on Fluidized Bed technology, CFB 2021

作者： Pietsch, Swantje Kieckhefen, Paul Orth, Maike Heinrich, Stefan Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology Denickestraße 15 Hamburg21073 Germany

ISBN: (纸本)9781771368506

Fluidized bed spray granulation has been applied for more than 60 years in various industries, as chemical, pharmaceutical and food industry and allows the production of tailor-made particles with defined product properties. Nevertheless, the connection between the process parameters and the later granule morphology and product properties is still challenging and not yet fully understood. In this study, spray granulation experiments were performed in a lab-scale fluidized bed (GF 3, Glatt GmbH, Germany) with various process parameters to determine the influence on the granule morphology and the surface roughness. Non-porous Cellets® 500 particles were sprayed with a sodium benzoate solution in bottom-spray configuration with a two-fluid nozzle. By applying a design of experiment approach, meaningful experiments with varying gas volume flow rate, fluidization gas temperature, spray rate and pressure of the nozzle air were performed. The influence of the temperature of the atomization air in the two-fluid nozzle is shown to have a major impact on the resulting surface structure. © 2021 CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed technology. All rights reserved.

关键词： Air

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Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching

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Journal of Advanced Ceramics 2023年第10期12卷 1973-1988页

作者： Zhiguang Wang Min Ge Shouquan Yu Xiaoming Sun Xueli Qi Hao Zhang Wen Xiao Weigang Zhang University of Chinese Academy of Sciences Beijing 100080China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 100080China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China Shandong Industrial Ceramics Research and Design Institute Zibo 255000China

High-temperature stretching plays a crucial role in enhancing the performance of fibres,while a quantitative investigation into the impacts of tension and stretching duration on the microstructure and performance of hexagonal boron nitride(h-BN)fibres remains *** this study,to elucidate the microstructural evolution of the h-BN fibres under thermal stretching,amorphous BN fibres were heated at 2000℃under tension of 30,50,and 70 N for 1,3,and 5 h in a nitrogen ***,the grain size,pore structure,orientation degree,microscopic morphology,and mechanical properties were analysed at room *** results show that high-temperature stretching enhances the orientation degree of the BN fibres,consequently elevating Young’s *** maximum orientation degree of the BN fibres was 86%,aligning with a corresponding Young’s modulus of 206 ***,high-temperature stretching enlarged the sizes of grains and pores,a fact substantiated by the radial cracking of the fibres upon extending thermal stretching *** to the expanded pore structure of the BN fibres and the inability to form a sufficiently strong“card structure”between shorter microfibre bundles,the tensile strength of the BN fibres did not increase continually,reaching a maximum of 1.0 *** observations revealed that the BN fibres,composed of highly oriented lamellar h-BN grains,tend to form radial textures under high-tensile thermal stretching and onion-skin textures under prolonged thermal *** findings offer a theoretical foundation for the preparation of high-performance h-BN fibres.

关键词： polymer-derived ceramics boron nitride fibres microstructural evolution high-temperature stretching

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Special Issue for the 14th Global Chinese Chemical engineering Symposium

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Frontiers of Chemical Science and engineering 2023年第10期17卷 1321-1322页

作者： Jesse Zhu Junwu Wang Particle Technology Research Centre Western UniversityLondonOntario N6A 5B9Canada State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The Global Chinese Chemical engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and *** special issue is a collection of the keynote lectures presented by the winners of Future Chemical engineering Scholars,the Global Award for Outstanding Young Female Chemical Engineers,and the International Award for Outstanding Young Chemical Engineers,selected by the International Scientific Committee of the GCCES.

关键词： engineering. Global Engineers

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Structural Evolution of Biomass Pellets of Different Densities During High and Low Convection Pyrolysis

SSRN

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SSRN 2025年

作者： Sadeq, Abdullah Schmitt, Marian Wang, Shen Rothberg, Sophia Pietsch-Braune, Swantje Shen, Laihong Heinrich, Stefan Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology Hamburg21073 Germany Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University Nanjing210096 China

In this study, wood pellets of different densities were produced from wood shavings of the same batch using a flat die press. Their structure and mechanical properties were investigated and compared to the properties after subsequent pyrolysis with two setups: high convection (HC) pyrolysis in a fluidized bed and low convection (LC) pyrolysis. Various measurement methods were used to investigate the structural properties and the applicability of wood pellets and pellet char. It could be shown that although pellet chars from LC-pyrolysis exhibit a cylindrical shape, their mechanical stability is significantly reduced due to the greatly increased porosity. However, the characteristics in the radial porosity distribution remained as in the untreated pellets. In contrast, HC-pyrolysis in a fluidized bed led to severe structural damage resulting in pellet chars with larger cavities, mainly in their central regions. Consequently, a higher porosity in the center and a lower mechanical stability was determined. Furthermore, it became clear that low-density wood pellets produced with a flat die press equipped with short press channels are especially prone to these structural changes. It is assumed that an open pore network with big cracks and gaps between wood shavings within wood pellets in combination with high heat and mass transfer during pyrolysis can enhance the release of volatiles from the pellet. With micro computed tomography (µCT), it could be shown that cavities in pellet chars are likely formed at wood pellet regions with smaller wood shavings. © 2025, The Authors. All rights reserved.

关键词： Computerized tomography

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Modelling of dust emissions induced by flow over stockpiles and through packed beds

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Particuology 2021年第6期19卷 55-63页

作者： Daniel Schulz Nadja Schwindt Eberhard Schmidt Harald Kruggel-Emden Technische Universitat Berlin Chair of Mechanical Process Engineering and Solids ProcessingEmst-Reuter-Platz 1D-10587 BerlinGermany University of Wuppertal Institute of Particle TechnologyRainer-Gruenter-StrGeb.FFD-42119 WuppertalGermany

Dust emissions during storage of non-moving bulk materials are studied with a numerical *** model relies on a contact-model-free Discrete Element Method(DEM)to model the bulk particle-fluid interaction and the dust removal coupled with Computational Fluid Dynamics(CFD)to model the gas and the dust phase in a multiphase ***,two storage scenarios are considered:a flown through packed bed and a flown over *** the first,the performed simulations reveal that the dust discharge can be correlated with the passing fluid pressure *** the second,a parameter study of factors influencing the dust emissions is *** parameters discussed are the stockpile size,the gas velocity,the slope angle,the particle diameter and the shape of the stockpile,taking into account conical and truncated conical *** release correlations are obtained for both scenarios,which reflect very well the obtained numerical results.

关键词： Computational Fluid Dynamics(CFD) Discrete Element Method(DEM) Dust release correlations Stockpile emissions Packed bed emissions

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