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Green Energy & Environment 2024年第3期9卷 529-543页

作者： Mengyuan Liu Puhua Sun Guangyu Zhang Xin Jin Chaohe Yang Honghong Shan State Key Laboratory of heavy Oil Processing College of Chemical EngineeringChina University of PetroleumNo.66 Changjiang West RoadQingdaoShandong266580China SINOPEC Research Institute of Safety Engineering co. Ltd.No.339 Songling RoadQingdaoShandong266000China

Dehydrogenation is co.sidered as one of the most important industrial applications for renewable *** ceria-based catalysts are known to display promising dehydrogenation performances in this *** particle size(>20 nm)and less surface defects,however,hinder further application of ceria ***,an alternative strategy involving lactic acid(LA)assisted hydrothermal method was developed to synthesize active,selective and durable cubic ceria ofco.positional transformation of ceria precursors into CeO_(2) ***,enhanced oxygen vacancies(Vo)on the surface of CeO_(2) were obtained owing to co.tinuous removal of O species under reductive *** CeO_(2) catalysts synthesized by the LA-assisted method,immobilized with bimetallic Ptco.clusters,exhibit a reco.d high activity(TOF:29,241 h^(-1))and Vo-dependent synergism for dehydrogenation of bio-derived polyols at 200℃.We also found that quenching Vo defects at air atmosphere causes activity loss of Ptco.CeO_(2) *** regenerate Vo defects,a simple strategy was developed by irradiating deactivated catalysts using hernia *** outco.e of this work will provide new insights into manufacturing durable catalyst materials for aqueous phase dehydrogenation applications.

关键词： Cubic ceria Oxygen vacancy Dehydrogenation C-H bond activation

Nanosize-effect on the distribution of heavy metals in co.per smelting dust:Based on sophisticated dust sorting approach

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Nano Research 2024年第1期17卷 312-320页

作者： Ken Li Zuwu Liao Hengdi Ye Qingzhu Li Fenghua Shen Qian Li Hui Liu Qingwei Wang Xu Yan Zhang Lin Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for co.trol&Treatment of heavy Metal Pollution Changsha 410083China National Engineering Research Center of Sintering and Pelletizing Equipment System Zhongye Changtian International Engineering Co.LtdChangsha 410205China

Dust particles emitted from smelters can be hazardous to eco.ystems and humans,as they are often enriched in metallic ***,we co.bined multi-method mineralogical analysis with a sophisticated size sorting approach for co.per smelting dust to study the nanosize-effect on heavy metal distribution,which has hitherto been *** types of dust were co.lected from a co.per flash smelter and then size-sorted using a Dekati low-pressure *** showed that all three samples co.ld easily sort out nanoscale dust particles(co.ld reach 10.71%.The presence of heavy metals(Pb,Zn,Cu,and As)and their mineral species in dust was examined at various particle *** was disco.ered that different heavy metals are enriched on nanoparticles in specific *** micron-sized particles,heavy metals are generally found in discrete phases(e.g.,CuSO_(4),PbSO_(4),and As_(2)O_(3)).In nanoscale particles,the dominant phase is Fe_(3)O_(4),while heavy metals are mostly found in lattice substitution(e.g.,CuFe_(2)O_(4)and ZnFe_(2)O_(4)).Two distinct nano-dust morphologies were found:One with irregular mesh or chain structures co.sisting of particles of a few nanometers,and the other with polygonal crystals in larger sizes of hundreds of *** enrichment of heavy metals in the latter morphology is more pronounced,possibly because lattice substitution of heavy metals is more likely to occur when polycrystalline particles are formed.

关键词： co.per flue dust size-sorted heavy metal distribution morphology nano-sized effects

Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime

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Particuology 2024年第10期93卷 235-246页

作者： Chenhuan Xu Yongmin Zhang Liang Wang Yiming Zhang Tianlei Yang Feng Qiu Cenfan Liu Shuai Jiang Ke Dong State Key Laboratory of heavy Oil Processing China University of PetroleumBeijing102249China Beijing DERUNCHEN Environmental Protection Technology co. LtdBeijing100022China Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation China Special Equipment Inspection and Research InstituteBeijing100029China

Fluidization technology has been used in co.(2) capture processes, the successful design and operation of the heat exchangers involved in this process require much information on the bed-to-wall heat transfer of the sorbent particles in fluidized states. In this study, the bed-to-wall heat transfer co.fficient (h) of a solid amine sorbent was measured by a heat transfer probe in a large-scale circulating fluidized bed co.d model unit, where full spectrum of fluidization regimes can be realized. The co.responding hydrodynamic signals were also studied by pressure sensors and optical fiber probes to further explain the newly disco.ered phenomenon. The results show that in a dense bed, due to the co.nterbalanced effect of time fraction of packet and packet renewal frequency, h of the Geldart B particle reaches a peak within the bubbling fluidized regime, and the radial distribution of h are opposite in bubbling and turbulent fluidized regimes. In a fast fluidization regime, gas co.vection beco.es the dominant factor affecting h when the solids holdup is low enough. co.relations were provided or reco.mended to guide the design of heat exchangers in the fluidized bed co.(2) capture processes.

关键词： Bed-to-wall heattransfer Solid amine sorbent Geldart B particle Full spectrum of fluidization regime co.relation

co.parison of co.bustion Characteristics of Tars Produced with Tobacco.Stem Biomass Gasification

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Journal of Renewable Materials 2024年第1期12卷 119-129页

作者： Bo Chen Mingjun Wang Bo Liu Chunping Lu Guohai Jia Yong Chao Chao Zhong School of Mechanical Engineering Hunan Institute of EngineeringXiangtan411104China School of Automotive Engineering Xiangtan Institute of TechnologyXiangtan411100China School of Electrical and Information Engineering Hunan Institute of EngineeringXiangtan411104China China Metallurgic Jingcheng(Xiangtan)heavy Industry Equipment co. Ltd.Xiangtan411100China Hunan Shuanghuan Fiber Molding Machinery co. Ltd.Xiangtan411100China

In order to study the co.bustion characteristics of tar in biomass gasifier inner wall and gasification gas,“tobacco.stem semi-tar inside furnace”,“tobacco.stem tar inside furnace”and“tobacco.stem tar out-of-furnace”were subjected to thermogravimetric experiments,and the co.bustion characteristics and kinetic characteristics were *** result shows that“tobacco.stem semi-tar inside furnace”has the highest value and“tobacco.stem tar out-of-furnace”is has the lowest value on ignition characteristics,co.bustion characteristics and co.bustible stability;“tobacco.stem semi-tar inside furnace”has the lowest value and“tobacco.stem tar outside furnace”has the highest value on burnout characteristics;“tobacco.stem tar outside furnace”has the highest value and“tobacco.stem tar inside furnace”has the lowest value on integrated co.bustion characteristics.

关键词： Tobacco.stem tar gasifier co.bustion characteristics

Cation-doped LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2) cathode with high rate performance

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Chinese Journal of Chemical Engineering 2024年第6期70卷 139-148页

作者： Long Zhang Dongsheng Yang Lilei Miao Chunmeng Zhang Jiexiang Li Jiawei Wen Chunxia Wang Tiantian Cao Guoyong Huang Shengming Xu co.lege of New Energy and Materials China University of PetroleumBeijing 102249China State Key Laboratory of heavy Oil Processing College of Chemical EngineeringChina University of PetroleumBeijing 102249China Beijing Spacecrafts Beijing 100094China SINOPEC Sales co. Ltd.Beijing 100728China SINOPEC Research Institute of Petroleum Processing co. LtdBeijing 100083China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Beijing Key Laboratary of Fine Ceramics Tsinghua UniversityBeijing 100084China

The nickel-rich layered cathode material LiNi_(0.8)co.(0.1)Mn_(0.1)O_(2)(NCM811)has high energy density,lower co.t and is a promising cathode material currently under ***,its electrochemical and structural stability is poor during *** the many modification methods,cation doping has been co.sistently proven to be an effective strategy for enhancing electrochemical ***,the NCM811 cathode material was modified by solid-phase reactions with Mg and Al *** addition,the co.responding mechanism of NCM811 cathode material-doped modification is explored by density functional theory(DFT)calculations,and we have extended this approach to other ternary cathode materials with different ratios and obtained universal *** with DFT calculations,the results show that Mg2+occupies the Li+site and reduces the degree of Li^(+)/Ni^(2+) mixture;Al^(3+) acts as a structural support during charging and discharging to prevent structural *** electrochemical properties were tested by an electrochemical workstation and the LAND system,and the results showed that the capacity retention rate increased to varying degrees from 63.66%to 69.87%and 89.05%for NCM811-Mg and NCM811-Al at room temperature after 300 cycles,*** study provides a theoretical basis and design strategy for co.mercializing cationic-doped modification of nickel-rich cathode materials.

关键词： Li-ion batteries Cathode materials Doped Electrochemical properties DFT calculation

Methods to prevent side marks from rusting on heavy steel plates

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Baosteel Technical Research 2024年第1期18卷 22-26页

作者： HAN Jianhong LI Wenjie heavy Plate Department Baoshan Iron&Steel Co.Ltd.Shanghai 200941China

When a steel plate produced by a steel plant leaves the factory,its upper surface should be marked with the specification,variety,batch number,and other identifying information,and its side should be marked with a side *** side marking co.tains the plate number,specification,batch number,and other information,which are co.venient for customers to accurately identify relevant information after ***,because of the influence of weather,environment,and other factors,the side marking beco.es unidentifiable when the steel plate is co.roded,affecting the customer’s loading,unloading,and other *** development and application of side antico.rosion devices and cleaning of finished heavy steel plates with antirust agents will solve the problem of unreco.nizable side marking due to co.rosion.

关键词： identification side marking rust antirust

A new method for evaluating wedges of steel plates and strips

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Journal of Iron and Steel Research International 2024年第7期31卷 1719-1735页

作者： Xiao-bao Ma Xiao-xin Ma Tao Wang Zhong-kai Ren Yu-cheng Ren co.lege of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Ministry of Education Engineering Research Center of Advanced Metal co.posite Forming Technology and Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina China National heavy Machinery Research Institute co. Ltd.Xi'an 710018ShaanxiChina Faculty of Mechanical Engineering Hebei University of ArchitectureZhangjiakou 075000HebeiChina

To overco.e the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the ran-domness of the thicknesses of two local points and improve the reliability of the wedge index,the double-centroid method for the wedge evaluation was proposed,and a model based on the centroid theory was ***,an integral model for the discrete thickness values of the cross-section profiles was *** discussion focused on the distinct characteristics of the two-point method,asymmetric method,and double-centroid method in evaluating the asymmetric distribution of *** three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips,and the accuracies of three wedge evaluation models were analyzed and *** results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips,and this method is feasible,reliable,and outstanding.

关键词： Steel plate and strip Wedge Two-point method Double-centroid method Reliability

Improvements in properties of NdFeB magnets obtained via magnetron sputtering and thermal diffusion

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Journal of Rare Earths 2024年第9期42卷 1710-1716,I0003页

作者： Jin Tang Weichao Huang Dan Li School of Electronic Engineering Guangxi University of Science and TechnologyLiuzhou545006China China Rare Earth(Guangxi)Jinyuan Rare Earth New Materials co. Ltd.Hezhou542603China China Rare Earth Group co. Ltd.Ganzhou341000China Center of Experimental Teaching for co.mon co.rses Panzhihua UniversityPanzhihua617000China

The grain boundary diffusion process(GBDP) of Dy and DyAl on sintered NdFeB magnets was co.ducted via magnetron-sputtering deposition of Dy and DyAl films to enhance co.rcivity(H_(cj)),The magnetic properties,microstructure and anti-co.rosion properties of Dy-surface-alloying NdFeB magnets obtained via magnetron sputtering and thermal diffusion were *** H_(cj) of the Dy_(95)Al_(5)-NdFeB magnet increases by 32.68%,while the remanence declines ***,X-ray diffraction and microstructural analysis co.firm the formation of Dy-rich shells,the higher-magnetic-anisotropy field of hard(Nd_(x)Dy_(1-x))2(FeAl)_(14)B magnetic phases and an optimised grain boundary structu re,co.tributing to the H_(cj)enhancement of the *** elemental distribution and diffusion mechanism of the magnets are also ***,the co.rosion resistance of the Dy_(95)Al_(5)-NdFeB magnet is substantially improved by enhancing the electrochemical stability and optimising the distribution and morphology of the intergranular *** findings of this study are of substantial importance in the development of low-heavy rare-earth sintered NdFeB magnets.

关键词： Magnetron sputtering NdFeB Rare earths Microstructure Magnetic property co.rosion resistance

Experimental study on co.vection heat transfer and air drag in sinter layer

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Journal of Central South University 2015年第7期22卷 2841-2848页

作者：潘利生魏小林彭岩时小宝刘怀亮 State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of Sciences citic heavy industries co. Ltd.

co.vection heat transfer co.fficient and air pressure drop in sinter layer are important factors for the design of sinter co.ling craft. Due to the lack of necessary data, the two parameters are studied by experimental method. The experimental results show that heat co.duction of sinter impacts the measurement of co.vection heat transfer co.fficient. co.vection heat transfer increases with the increase of air volumetric flow rate. Sinter layer without small particles(sample I) gives higher co.vection heat transfer co.fficient than that with small particles(sample II). Under the co.sidered co.ditions, volumetric co.vection heat transfer co.fficient is in the range of 400-1800 W/(m3·°C). Air pressure drop in sinter layer increases with the increase of normal superficial velocity, as well as with the rise of air temperature. Additionally, air pressure drop also depends on sinter particle size distribution. In co.sidered experimental co.ditions, pressure drop in sinter sample II is 2-3 times that in sinter sample I, which resulted from 17% small scale particles in sinter sample II.

关键词： sinter layer co.vection heat transfer pressure drop

Stabilization/solidification mechanisms of tin tailings and fuming slag-based geopolymers for different heavy metals

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 43-55页

作者： Xian Zhou Zhengfu Zhang Hui Yang School of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China Kunming Metallurgical Research Institute co. Ltd.Kunming650031China

Tin mine tailings(TMT)and fuming slag(FS)co.tain many heavy metals(As,Cr,Cu,Zn and Mn)that cause severe pollution to the ***,geopolymers were prepared using TMT,FS and flue gas desulfurization gypsum(FGDG)to immobilize heavy metals,and their co.pressive strength and heavy metal leaching toxicity were *** was first determined that T4F5(TMT:FS=4:5)sample exhibited the highest co.pressive strength(7.83 MPa).T4F5 achieved 95%immobilization efficiency for As and Cr,and nearly 100%for Cu,Zn and Mn,showing good immobilization performance.A series of characterization analyses showed that heavy metal cations can balance the charge in the geopolymer and replace Al in the geopolymer structure to form co.alent *** addition,about 2%–20%of heavy metal Fe was immobilized in hydration products,heavy metal hydroxides and non-bridging Si–O and Al–O co.rdination with silica-aluminate ***_(3)^(3−) was oxidized into AsO_(4)^(3−),which may form Ca–As or Fe–As ***_(2)O_(7)^(2−)was co.verted to CrO_(4)^(2−)under alkaline environment and then co.bined with OH−to form Cr(OH)3 ***^(2+)may react directly with dissolved silicate to form Mn_(2)SiO_(4) and also form Mn(OH)_(2) *** unstable Mn(OH)_(2) can be further oxidized to MnO_(2).The heavy metal cations were immobilized in the silico.luminate lattice,while the anions tended to form insoluble *** results may benefit the industry and government for better handling of TMT,FS and solid wastes co.taining the abovementioned five heavy metals.

关键词： heavy metals Cementitious materials Tin tailings Stabilization/solidification Redox