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Simulations of sorbent regeneration in a circulating fluidized bed system for sorption enhanced steam reforming with dolomite

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Particuology 2020年第3期18卷 156-172页

作者： Kiattikhoon Phuakpunk Benjapon Chalermsinsuwan Sompong Putivisutisak Suttichai Assabumrungrat Center of Excellence in Catalysis and Catalytic Reaction engineering Department of Chemical EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok10330Thailand energy Research Institute Chulalongkorn UniversityBangkok10330Thailand Fuels Research Center Department of Chemical TechnologyFaculty of ScienceChulalongkorn UniversityBangkok10330Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn UniversityBangkok10330Thailand Advanced Computational Fluid Dynamics Research Unit Chulalongkorn UniversityBangkok10330Thailand Department of Mechanical engineering Faculty of EngineeringChulalongkorn UniversityBangkok10330Thailand

In this work,the sorption enhanced steam reforming (SESR) method was developed for improved hydrogen (H2) production,and the drawbacks of conventional steam reforming processes on H2 yield and purity were ***,the SESR process is discontinuous and requires regeneration after sorbent saturation with *** circulating fluidized bed reactor (CFBR) system has previously been proposed for continuous H2 production,with both reforming and sorbent regeneration occurring *** main aim of this work was to determine the feasibility and performance of SESR with a proper design and conditions in conjunction with the CFBR *** reforming riser and bubbling bed regenerator are studied separately but related to each ***-dimensional transient models using the Euler-Euler approach and kinetic theory of granular flow were used for fluid dynamic simulations combined with the decarbonation kinetics of dolomite,to investigate a conceptual regenerator system and determine its key conditions.A mixture of the Ni-based catalyst and dolomite from the risers was injected with a flux of 200 kg/(m2 s) and a catalyst to sorbent ratio of 2.54 kg/kg.A double-stage bubbling bed regenerator system was designed with 1.2 m width,0.8 m bed height,a gas inlet velocity of 0.2 m/s and solid preheating at 950 ℃.The used dolomite was regenerated with an assumed CaO conversion of 3%;the almost fresh dolomite was then released with good mixing of the catalyst and sorbent.

关键词： CaO sorbent Regenerator Computational fluid dynamics Circulating fluidized bed Multiphase flow model

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Quinoidal conjugated materials:Design strategies and thermoelectric applications

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Nano Research energy 2024年第1期3卷 220-235页

作者： Runshi Wu Dafei Yuan Xiaozhang Zhu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Materials Science and engineering Hunan UniversityChangsha 410082China

The growing demand for waste heat energy recovery from electronic devices,solar energy,and industrial production has led to increased attention on thermoelectric *** the past decades,significant progress has been achieved in inorganic thermoelectric ***,flexible,lightweight,and bio-friendly organic thermoelectric(OTE)materials have emerged as promising candidates for thermoelectric *** particular,quinoidal conjugated small molecules and polymers with high mobility are suitable for thermoelectric *** kind of materials have gained increasing research interest due to their unique structural features and characteristics of polarons’***,quinoidal materials with high mobility and conductivity have been developed,and their use for thermoelectric conversion has been increasingly *** perspective summarizes the recent advancements in the design and synthesis of quinoidal conjugated small molecules and polymers,their advantages for thermoelectric conversion,and the latest reports on their charge carrier transport ***,to further enhance the TE performances of quinoidal materials,the existing challenges are discussed and the future developments are also outlooked.

关键词： organic semiconductors organic conjugated materials quinoid organic materials organic thermoelectric

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Nitrogen-doped carbon nanotube-encapsulated nickel nanoparticles assembled on graphene for efficient CO2 electroreduction

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Chinese Chemical Letters 2020年第6期31卷 1438-1442页

作者： Tingting Wang Jian Yang Jiayi Chen Qinggang He Zhongjian Li Lecheng Lei Jianguo Lu Michael K.H.Leung Bin Yang Yang Hou Key Laboratory of Biomass Chemical engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Ability R&D energy Research Centre(AERC) School of Energy and EnvironmentCity University of Hong KongHong Kong 999077China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Exploring 3 D hybrid nanocarbons encapsulated with metal nanoparticles(NPs)are recently considered as emerging catalysts for boosting CO2 electroreduction reaction(CRR)under practical and economic ***,we report a one-step pyrolysis strategy for fabricating N-doped carbon nanotube(CNT)-encapsulated Ni NPs assembled on the surface of graphene(N/NiNPs@CNT/G)to efficiently convert CO2 into *** such 3 D hybrid,the particle size of Ni NPs that coated by five graphitic carbon layers is less than 100 nm,and the amount of N dopants introduced into graphene with countable CNTs is determined to 7.27 at%.Thanks to unique CNT-encapsulated Ni NPs structure and N dopants,the achieved N/NiNPs@CNT/G hybrid displays an exceptional CRR activity with a high Faradaic efficiency of 97.7%and large CO partial current density of 7.9 mA/cm2 at-0.7 V,which outperforms those reported metallic NPs loaded carbon based CRR ***,a low Tafel slope of 134 mV/dec,a turnover frequency of 387.3 CO/h at-0.9 V,and tiny performance losses during long-term CRR operation are observed on N/NiNPs@CNT/*** observations illustrate that the Ni NPs encapsulated by carbon layers along with N dopants are of great importance in the conversion of CO2 into CO with high current density.

关键词： CO2 electroreduction Graphene nanosheets Ni nanoparticles N dopants 3D hybrid

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On high-performance rotational energy harvesting with a novel cam-like dielectric elastomer generator

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Science China(Technological Sciences) 2023年第5期66卷 1317-1334页

作者： FANG ShiTong WANG ShuaiBo ZHANG GuoQing WANG Chen XU JunChen WANG ZhouZhou FENG AiJie QIAO ZiJian YURCHENKO Daniil LAI ZhiHui Shenzhen Key Laboratory of High-Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China School of Mechanical engineering and Mechanics Ningbo UniversityNingbo315211China Institute Sound and Vibration Research University of SouthamptonSouthamptonSO171BJUK

Rotational energy is a type of common energy source that can be harvested for supplying low-powered electronic *** paper proposes and investigates a novel cam-like dielectric elastomer generator(CDEG)for high-performance rotational energy harvesting.A mushroom-head clamp is designed to form a type of advanced conical dielectric elastomer membranes(DEMs).Moreover,a type of multi-protrusion cam mechanism is designed in the CDEG to effectively convert any external rotational excitation into a linear reciprocating motion,which can be further converted into electricity through the ***,the operating principle of the system under external rotational excitation is analyzed theoretically by deducing the deformation condition of the DEMs and the electrical output of the ***,the prototype is fabricated,and the rotational-to-linear motion conversion rule of its cam-like mechanism and the DEM capacitance calculation approach are *** experimental results show that adequate charging time and discharging time of the DEMs,which can be realized through the proposed cam-like mechanisms,are beneficial to the energy harvesting(EH)performance of the ***,with the validated theoretical model,numerical simulations are conducted to further study the system dynamics and the influences of important system parameters on the EH performance to provide a guideline for system ***,the genetic algorithm is adopted to obtain the optimal system parameters and the corresponding electrical output of the proposed CDEG,demonstrating its superior output power at ultralow rotational frequencies compared with other typical rotational energy harvesters in the literature.

关键词： rotational energy harvesting dielectric elastomer generator cam-like mechanism rotational-to-linear conversion theoretical model

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Strategies for CO2 capture from different CO2 emission sources by vacuum swing adsorption technology

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Chinese Journal of Chemical engineering 2016年第4期24卷 460-467页

作者： Jianghua Ling Penny Xiao Augustine Ntiamoah Dong Xu Paul Webley Yuchun Zhai School of Material and Metallurgy Northeastern University Shenyang 110004 China Department of Chemical and Biomolecular engineering The University of Melbourne VIC 3010 Australia Guodian New energy Technology Research Institute China Guodian Corporation Beijing 100000 China

Different VSA(Vacuum Swing Adsorption) cycles and process schemes have been evaluated to find suitable process configurations for effectively separating CO2 from flue gases from different industrial sectors. The cycles were studied using an adsorption simulator developed in our research group, which has been successfully used to predict experimental results over several years. Commercial zeolite APGIII and granular activated carbon were used as the adsorbents. Three-bed VSA cycles with- and without-product purge and 2-stage VSA systems have been investigated. It was found that for a feed gas containing 15% CO2(representing flue gas from power plants), high CO2 purities and recoveries could be obtained using a three-bed zeolite APGIII VSA unit for one stage capture, but with more stringent conditions such as deeper vacuum pressures of 1–3 k Pa. 2-stage VSA process operated in series allowed us to use simple process steps and operate at more realistic vacuum pressures. With a vacuum pressure of 10 k Pa, final CO2 purity of 95.3% with a recovery of 98.2% were obtained at specific power consumption of 0.55 MJ·(kg CO2)-1from feed gas containing15% CO2. These numbers compare very well with those obtained from a single stage process operating at1 k Pa vacuum pressure. The feed CO2 concentration was very influential in determining the desorption pressure necessary to achieve high separation efficiency. For feed gases containing N 30% CO2, a singlestage VSA capture process operating at moderate vacuum pressure and without a product purge, can achieve very high product purities and recoveries.

关键词：二氧化碳浓度变压吸附技术真空变压吸附捕捉 CO2原料气排放源真空压力产品纯度

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Synthese, photo-induced NO-release and photodynamic reactions of nitrosylruthenium complexes

Synthese, photo-induced NO-release and photodynamic reaction...

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2018年中西部地区无机化学化工学术研讨会

作者： Xiaolu Wang Leilei Xie Lifang Liu Wenming Wang Hongfei Wang Key Laboratory of Chemical Biology and Molecular engineering of Education Ministry Institute of Molecular Science Shanxi University Key Laboratory of energy conversion and Storage Materials of Shanxi Provence Institute of Molecular Science Shanxi University

In recent years, the discovery of nitric oxide（NO） as a signaling molecule in various physiological and pathological pathways has spurred research on the design of metal nitrosyl complexes with novel photo-induced reactivity and cellar biological activity [1–4]. In this work, nitrosylruthenium complexes using 8-hydroxyquinoline derivatives and amino acids as ligands were synthesized, and their photodynamic reactions were investigated. The photochemical DNA cleavage of the complexes was also demonstrated, possibly due to photo-induced free radicals. The crystal structures were determinated by X-ray diffraction, the photo-induced NO-release were confirmed through spin trapping of the electron paramagnetic resonance spectroscopy（EPR）, and the dynamic process of the NO dissociation upon photo irradiation was monitored using time-resolution and two-dimensional correlation infrared spectroscopy. The life time of the excited states for some complexes were measured and compared through super-fast absorption spectral technology. Furthermore, the binding constants of the complexes with calf thymus DNA and human serum albumin were calculated by fluorescence spectroscopy to understand the effects of the substituent groups on the biological activity. The DFT calculation were also performed to analyze and understand the photo induced the dissociation of the metal nitrosyl complexes. This provided the basis for design of NO-donors with potential applications in photodynamic therapy.

关键词： Ruthenium complexes nitric oxide bio-macromolecules spectroscopy photodynamic

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Construction of oxygen defective ZnO/ZnFe_(2)O_(4) yolk-shell composite with photothermal effect for tetracycline degradation:Performance and mechanism insight

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Chinese Chemical Letters 2023年第1期34卷 452-456页

作者： Ke Zhang Hongyang Cao Afzal Dar Danqing Li Lina Zhou Chuanyi Wang School of Environmental Science and engineering Shaanxi University of Science and TechnologyXi’an 710021China

Oxygen vacancy induced photothermal effect is of great significant but lack of adequate attentions for environmental *** this paper,green recyclable ZnO/ZnFe_(2)O_(4) with oxygen vacancy was prepared by a solvothermal-calcination *** UV-vis light capture ability of ZnO/ZnFe_(2)O_(4) microspheres is improved with the multiple light reflections due to the yolk-shell structure,and the oxygen vacancy expands the absorption range of photocatalyst and enhances photothermal *** optimized photocatalyst can heat the solution from room temperature to 70°C within 60 min of visible light illumination,and the light to heat conversion efficiency is achieved by 61.3%.Compared with the degradation efficiency at 20°C,photothermal catalysis achieves a stable degradation in 80 min,and the degradation efficiency is increased by 41.5%.This can be attributed to the fact that light induced thermal energy accelerates the migration of electrons and holes,and promotes the diffusion of free radicals by heating active centers in *** active species contributing to the degradation,in order of importance,are the superoxide radical,hydroxyl radical,hole and *** light-to-thermal assisted photocatalysis with ZnO/ZnFe_(2)O_(4) provides a new sight for the pollution control in the future practical applications.

关键词： Photocatalysis Photothermal Oxygen vacancy Yolk-shell Tetracycline

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Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO_2

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Journal of Environmental Sciences 2017年第3期29卷 141-150页

作者： Shibo Zhang Yongchun Zhao Zonghua Wang Junying Zhang Lulu Wang Chuguang Zheng State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology Henan Institute of Metallurgy Co. Ltd. Research Center of Quality Inspection Analysis and Test of Henan Academy of Sciences

A catalyst composed of manganese oxides supported on titania （MnOx/TiO2） synthesized by a sol-gel method was selected to remove nitric oxide and mercury jointly at a relatively low temperature in simulated flue gas from coal-fired power plants. The physico-chemical characteristics of catalysts were investigated by X-ray fluorescence （XRF）, X-ray diffraction （XRD）, and X-ray photoelectron spectroscopy （XPS） analyses, etc. The effects of Mn loading, reaction temperature and individual flue gas components on denitration and Hg0 removal were examined. The results indicated that the optimal MrgTi molar ratio was 0.8 and the best working temperature was 240℃for NO conversion. 02 and a proper ratio of [NH3]/[NO] are essential for the denitration reaction. Both NO conversion and Hg0 removal efficiency could reach more than 80% when NO and Hg0 were removed simultaneously using Mn0.8Ti at 240℃. Hg0 removal efficiency slightly declined as the Mn content increased in the catalysts. The reaction temperature had no significant effect on Hg0 removal efficiency. 02 and HCI had a promotional effect on Hg0 removal. SO2 and NH3 were observed to weaken Hg0 removal because of competitive adsorption. NO first facilitated Hg0 removal and then had an inhibiting effect as NO concentration increased without 02, and it exhibited weak inhibition of Hg0 removal efficiency in the presence of 02. The oxidation of Hg0 on MnOx/ TiO= follows the Mars-Maessen and Langmuir-Hinshelwood mechanisms.

关键词： ManganeseTitaniaNitric oxideMercurySCR

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A new current sensor incipient fault diagnosis method for converters in wind energy conversion systems

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Science China(Information Sciences) 2022年第5期65卷 276-277页

作者： Songbing TAO Youqiang HU Shuiqing XU Yi CHAI Ke ZHANG College of Automation Chongqing University College of Electrical engineering and Automation Hefei University of Technology

Dear editor,The efficient and clean characteristics of wind energy have led to the development of wind power generation as one of the most sophisticated ways of power generation [1]. To guarantee the reliability and safety of the energy conversion process, current sensors have played a significant role in the wind energy conversion systems (WECSs). However, to the best of the author’s knowledge, the literature concerning current sensor fault diagnosis is limited.

关键词： Incipient fault Current sensor Fault diagnosis Wind power Instantaneous amplitude Fault location

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Effects of reduction temperature and content of Pd loading on the performance Pd/CeO2 catalyst for CO oxidation

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Chinese Chemical Letters 2019年第6期30卷 1153-1156页

作者： Yue Yan Huaxi Li Zhanghui Lu Xuewen Wang Rongbin Zhang Gang Feng Key Laboratory of Jiangxi Province for Environment and energy Catalysis College of Chemistry Nanchang University Nanchang 330031 China College of Chemistry and Chemical engineering Jiangxi Normal University Nanchang 330022 China

The content of noble metal loading and the reduction process of the catalysts are important factors influence the economic indicator and catalytic performance for industrial catalysis. In the present work, Pd/CeO2NT (Pd supported on the CeO2 nanotubes) catalysts are prepared with the hydrothermal synthesized CeO2NT and glutathione (GSH) reduced Pd nanoparticles via impregnation. The content of Pd loading as well as the catalysts reduction temperature are optimized to the CO oxidation reduction. Our results show that the best Pd loading is 1.5%Pd/CeO2NT. The catalysts reduced at 350 ℃ for 2 h prior to catalytic reaction perform the best toward CO oxidation, which reaches completely CO conversion at 70 ℃. The XRD, Raman, H2-TPR, TEM, BET and XPS characterization reveal that the excellent catalytic performance of 350 °C 1.5%Pd/CeO2NT sample can be attributed the high Pd^0 species and oxygen vacancy in the sample, which are important factors influence the activity of the catalysts.

关键词： CO oxidation Palladium catalyst Ceria nanotubes Reduction temperature Palladium content

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