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Quantitative discrimination of surface adsorbed NO_(x) species on CeO_(2) via spectrophotometry for SCR denitration investigation

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Journal of Rare Earths 2024年第6期42卷 1066-1072,I0003页

作者： Songil Sin jiawei ji Lijun Cheng Zhiwen Gu Chong Tan Kwangchol Ri Changjin Tang School of Environment Nanjing Normal UniversityNanjing210023China Department of Mining Engineering Kim Chaek University of TechnologyPyongyang999093Democratic People's Republic of Korea Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing20023China Institute of Chemical Engineering Hamhung University of Chemical EngineeringHamhungDemocratic People's Republic of Korea jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology Nanjing210023China

CeO_(2)-based catalysts are widely investigated for selective catalytic reduction(SCR)of NO with *** of NO/O_(2) with CeO_(2) generally produces two surface species,i.e.,nitrates and ***,the explicit quantification of these two species is still ***,we reported that spectrophotometry characterization was effective in determining surface adsorbed NOx species on CeO_(2) by measuring the corresponding ions(NO_(2)-and NO_(3)^(-))dissolved in aqueous *** results show that both nitrate(-NO_(3))and nitrite(-NO_(2))species can be quantitatively evaluated and the accuracy is verified by calibrating with NOx-TPD *** transfer of adsorbed NOx from catalyst surface to aqueous solution is confirmed and the dissolution process can be accelerated by ultrasonic ***,useful information related to evolution of surface NOx species under various conditions(O_(2) treatment,different adsorption temperature and duration)and over different catalysts(Fe_(2)O_(3),MnO_(2) and MnOx—CeO_(2))are *** result of present study demonstrates the potential of spectrophotometry for quantitative discrimination of surface NOx species on CeO_(2) and other oxide-based materials,which is conducive to mechanism analysis of SCR reaction.

关键词： Quantitative evaluation Spectrophotometry analysis Nitrate species Nitrite species CeO_(2)catalyst NH_(3)-SCR

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A 3-Node Co-Rotational Triangular Finite Element for Non-Smooth,Folded and Multi-Shell Laminated Composite Structures

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Computer Modeling in Engineering & Sciences 2021年第11期129卷 485-518页

作者： Zhongxue Li jiawei ji Loc Vu-Quoc Bassam A.Izzuddin Xin Zhuo Department of Civil Engineering Zhejiang UniversityHangzhou310058China Aerospace Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Civil and Environmental Engineering Imperial College LondonLondonSW72BUUK

Based on the first-order shear deformation theory,a 3-node co-rotational triangular finite element formulation is developed for large deformation modeling of non-smooth,folded and multi-shell laminated composite *** two smaller components of the mid-surface normal vector of shell at a node are defined as nodal rotational variables in the co-rotational local coordinate *** the global coordinate system,two smaller components of one vector,together with the smallest or second smallest component of another vector,of an orthogonal triad at a node on a non-smooth intersection of plates and/or shells are defined as rotational variables,whereas the two smaller components of the mid-surface normal vector at a node on the smooth part of the plate or shell(away from non-smooth intersections)are defined as rotational *** these vectorial rotational variables can be updated in an additive manner during an incremental solution procedure,and thus improve the computational efficiency in the nonlinear solution of these composite shell *** to the commutativity of all nodal variables in calculating of the second derivatives of the local nodal variables with respect to global nodal variables,and the second derivatives of the strain energy functional with respect to local nodal variables,symmetric tangent stiffness matrices in local and global coordinate systems are *** overcome shear locking,the assumed transverse shear strains obtained from the line-integration approach are *** reliability and computational accuracy of the present 3-node triangular shell finite element are verified through modeling two patch tests,several smooth and non-smooth laminated composite shells undergoing large displacements and large rotations.

关键词： Co-rotational approach 3-node triangular finite element laminated composite shells folded and multi-shell structures vectorial rotational variable line integration approach large deformation analysis

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Topographic variation and fluid flow characteristics in rough contact interface

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Friction 2024年第12期12卷 2774-2790页

作者： jiawei ji Wei SUN Yu DU Yongqing ZHU Yuhang GUO Xiaojun LIU Yunlong jiAO Kun LIU Institute of Tribology School of Mechanical EngineeringHefei University of TechnologyHefei 230009China

Understanding flow characteristics of fluid near rough contact is important for the design of fluid-based lubrication and basic of tribology *** this study,the spreading and seepage processes of anhydrous ethanol in the interface between glass and rough PDMS are observed by a homemade optical in-situ *** image processing technology and numerical simulation software are adapted to identify and extract the topological properties of interface and thin fluid flow *** attention is paid to the dynamic evolution of the contact interface morphology under different stresses,the distribution of microchannels in the interface,the spreading characteristics of the fluid in contact interface,as well as the mechanical driving *** surface morphology and the contact stress have a significant impact on the interface topography and the distribution of interfacial microchannels,which shows that the feature lengths of the microchannels,the spreading area and the spreading rate of the fluid are inversely proportional to the *** the flow path of the fluid in the interface is mainly divided into three stages:along the wall of the island,generating liquid bridges,and moving from the tip side to the root side in the wedge-shaped *** main mechanical mechanism of liquid flow in the interface is the equilibrium between the capillary force that drives the liquid spreading and viscous resistance of solid wall to *** addition,the phenomenon of“trapped air”occurs during the flow process due to the irregular characteristics of the *** study lays a certain theoretical foundation for the research of microscopic flow behavior of the liquid in the rough contact interface,the friction and lubrication of the mechanical system,and the sealing mechanism.

关键词： rough contact interface fluid flow topography evolution microchannel in-situ observation

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Promotion effect of bulk sulfates over CeO_(2)for selective catalytic reduction of NO by NH_(3)at high temperatures

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Chinese Chemical Letters 2023年第5期34卷 311-314页

作者： jiawei ji Li Han Wang Song jingfang Sun Weixin Zou Changjin Tang Lin Dong Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of the Environment Nanjing UniversityNanjing 210023China School of Environment Nanjing Normal UniversityNanjing 210023China jiangsu Key Laboratory of Vehicle Emission Control Center of Modern AnalysisNanjing UniversityNanjing 210023China

Understanding the influence of sulfates over catalysts for selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR)is crucial due to the universal presence of SO_(2)in exhaust *** on the degree of sulfation,there mainly exist surface and bulk sulfates and NH_(3)-SCR activity is generally considered to suffer more from bulk ***,the unique function of bulk sulfates over Ce O_(2)in promoting hightemperature SCR reaction is ***,compared with CeO_(2)dominated with surface sulfates(S-CeO_(2)-4h)and commercial V_2O_5-WO_(3)/TiO_(2),CeO_(2)with bulk sulfates(S-Ce O_(2)-72h)exhibits admirable NO conversion at the temperature range of 400-550℃.Bulk sulfates provide more Br?nsted acid sites with stronger strength for NH_(3)***,the oxidation ability of Ce O_(2)is significantly inhibited due to electron-withdrawing effect from bulk sulfates,which alleviates NH_(3)oxidation at high *** NH_(3)adsorption with high stability and limited NH_(3)oxidation capacity ensure the excellent catalytic performance for S-CeO_(2)-72h in high-temperature *** work provides new insight of bulk sulfates in promoting SCR activity and open a new avenue to design de NO_xcatalysts employed at high temperatures.

关键词： NH_(3)-SCR CeO_(2) Bulk sulfates High temperature denitration NH_(3)adsorption NH_(3)oxidation

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Influence of CeO2 loading on structure and catalytic activity for NH3-SCR over TiO2-supported CeO2

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Journal of Rare Earths 2020年第8期38卷 883-890,I0002页

作者： Hongliang Zhang Long Ding Hongming Long jiaxin Li Wei Tan jiawei ji jingfang Sun Changjin Tang Lin Dong School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243032China Key Laboratory of Metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology) Ministry of EducationMa'anshan 243002China Analysis and Testing Central Facility Anhui University of TechnologyMa'anshan 243002China jiangsu Key Laboratory of Vehicle Emissions Control School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

A series of supported CeO2/TiO2 catalysts were prepared to explore the influence of CeO2 loading on these catalysts for the selective catalytic reduction of NO3 by NH3(NH3-SCR).The catalysts were investigated in detail by means of XRD,Raman,H2-TPR,NH3-TPD,XPS,in situ DRIFTS,and NH3-SCR *** activity of the catalyst is closely related to the content of *** the loading of CeO2 is near the dispersion capacity(1.16 mmol Ce4+/100 m^2 TiO2),the catalytic activity is *** may be because that the dispersed CeO2 is the active species and the catalyst has appropriate redox property,along with the larger amounts of surface Ce content and surface adsorbed oxygen ***,a possible reaction mechanism via the Langmuir-Hinshelwood(L-H)mechanism is tentatively proposed to further understand the NH3-SCR reaction.

关键词： CeO2 Selective catalytic reduction Redox property Dispersion capacity Structure-activity relationship Rare earths

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Methanol steam reforming for hydrogen production driven by an atomically precise Cu catalyst

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Green Energy & Environment 2024年第7期9卷 1079-1084页

作者： Weigang Hu Haoqi Liu Yuankun Zhang jiawei ji Guangjun Li Xiao Cai Xu Liu Wen Wu Xu Weiping Ding Yan Zhu School of Chemistry and Chemical Engineering Nanjing UniversityNanjing210093China School of Physical Science and Technology Ningbo UniversityNingbo315211China

Plasmon-induced hot-electron transfer from metal nanostructures is being intensely pursed in current photocatalytic research,however it remains elusive whether molecular-like metal clusters with excitonic behavior can be used as light-harvesting materials in solar energy utilization such as photocatalytic methanol steam *** this work,we report an atomically precise Cu_(13)cluster protected by dual ligands of thiolate and phosphine that can be viewed as the assembly of one top Cu atom and three Cu_(4)*** Cu_(13)H_(10)(SR)_(3)(PR’_(3))_(7)(SR=2,4-dichlorobenzenethiol,PR’_(3)=P(4-FC_(6)H_(4))_(3))cluster can give rise to highly efficient light-driven activity for methanol steam reforming toward H_(2)production.

关键词： Nanocluster Photocatalysis Methanol steam reforming Atomically precise Copper catalyst

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Enhancing low-temperature NH_(3)-SCR performance of Fe-Mn/CeO_(2)catalyst by Al_(2)O_(3)modification

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Journal of Rare Earths 2022年第9期40卷 1454-1461,I0005页

作者： Lulu Li jiawei ji Wei Tan Wang Song Xin Wang Xiaoqian Wei Kai Guo Wanyu Zhang Changjin Tang Lin Dong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China jiangsu Key Laboratory of Vehicle Emissions Control School of EnvironmentCenter of Modern AnalysisNanjing UniversityNanjing 210093China School of Environment Nanjing Normal UniversityNanjing 210093China

In the work,supported catalysts of FeO_(x) and MnO_(x) co-supported on aluminum-modified CeO_(2)was synthesized for low-temperature NH_(3)-selective catalytic reduction(NH_(3)-SCR)of ***,the SCR activity of the obtained catalyst is markedly influenced by the adding amount of Al and the appropriate Ce/Al molar ratio is 1/*** activity tests demonstrate that Fe-Mn/Ce1 Al2 catalyst shows over 90%NO conversion at 75-250℃and exhibits better SO_(2)resistance compared to Fe-Mn/CeO_(2).Fe-Mn/Ce1 Al2 shows the expected physicochemical characters of the ideal catalyst including the larger surface and increased active reaction active sites by controlling the amount of Al ***,the better catalytic activity is well correlated with the present advantaged surface adsorption oxygen species,Mn^(4+)species,Ce^(3+)species and the enhanced reducibility of Fe-Mn/Ce1 Al2,which is superior to the Fe-Mn/CeO_(2)*** importantly,we further demonstrate that the amount and strength of surface acid sites are improved by Al-doping and more active intermediates(monodentate nitrate)is generated during NH_(3)-SCR *** work provides certain insight into the rational creation of simple and practical denitration catalyst environmental purification.

关键词： Selectivity catalytic reduction NO removal Low-temperature activity Al doping Cerium dioxide Rare earths

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Distinct effect of preparation methods on reaction efficiency of Mn-Ce/Al_(2)O_(3) catalysts in low-temperature NH_(3)-SCR

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Journal of Rare Earths 2024年第10期42卷 1865-1872页

作者： Shijie Hao Yandi Cai Wei Wei Yanan Lv jiawei ji Wei Tan jingfang Sun Liwei jia Changjin Tang Lin Dong State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentJiangsu Key Laboratory of Vehicle Emissions ControlCenter of Modern AnalysisKey Laboratory of Mesoscopic Chemistry of MOESchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Wuxi Weifu Environmental Catalysts Co. LtdWuxi214028China School of Environment Nanjing Normal UniversityNanjing210023China

In this study,a series of Mn-Ce/Al_(2)O_(3) catalysts was prepared by different methods of depositionprecipitation(MnCeAl-DP),impregnation(MnCeAl-IM) and citric acid(MnCeAl-CA),and the distinct effect of preparation methods on NO_(x) removal performance at low temperature was *** show that MnCeAl-DP exhibits not only the best activity but also the highest resistance against SO_(2)/H_(2)*** the assistance of comprehensive characterizations from scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),H_(2)-temperature programmed reduction(H_(2)-TPR),NH_(3)-te mperature programmed deso rption(NH_(3)-TPD),and X-ray photoelectron spectroscopy(XPS),it is revealed that the MnCeAl-DP sample owns admired features of large surface area and pore volume,enriched Mn^(4+) and chemisorbed oxygen species originating from enhanced interaction between MnO_x and CeO_(2),as well as improved adsorption capacity to NH_(3) and *** these factors contribute to activity *** in-situ DRIFTS studies reveal that the improvement of NH_(3)-SCR performance over MnCeAI-DP is related to the formation of abundant nitrate species,which is beneficial to the "NH_(4)NO_(3)" reaction pathway and thus enhances low-temperature activity.

关键词： Mn-Ce/Al_(2)O_(3)catalysts NH_(3)-SCR Low temperature NH_(4)NO_(3) Fast SCR Rare earths

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Solid-phase impregnation promotes Ce doping in TiO_(2) for boosted denitration of CeO_(2)/TiO_(2) catalysts

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Chinese Chemical Letters 2022年第2期33卷 935-938页

作者： Wang Song jiawei ji Kai Guo Xin Wang Xiaoqian Wei Yandi Cai Wei Tan Lulu Li jingfang Sun Changjin Tang Lin Dong School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Key Laboratory of Vehicles Emission Control of jiangsu Province Center of Modern AnalysisNanjing UniversityNanjing 210093China School of Environment Nanjing Normal UniversityNanjing 210023China School of the Environment Nanjing UniversityNanjing 210093China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

CeO_(2)/TiO_(2)(denoted as Ce Ti) catalysts obtained by solid-phase impregnation behaved better in lowtemperature selective catalytic reduction of NO_(x)with NH_(3)(NH_(3)-SCR) than that by conventional wet *** explore the main factors for activity distinction,the texture property,CeO_(2)dispersion and structure changes of TiO_(2)were comprehensively *** was found that surface changes of TiO_(2)had a significant impact on the improved *** results of inductively coupled plasma atomic emission spectrometer (ICP-AES),diffuse reflectance UV-vis spectroscopy (UV-vis-DRS) and Raman,it was inferred that Ce ions were partially incorporated into TiO_(2)lattice,accompanied with the formation of defects and vacancies during solid-phase ***,Ce Ti catalysts from solid-phase impregnation exhibited superiority in adsorption and activation of *** result from monitoring the preparation process indicated that the evolved NO played an important role in promoting Ce doping through depriving oxygen atoms on TiO_(2)*** interaction between Ce and Ti was *** catalyst performed better in NH_(3)-SCR,especially at low temperature,which testified the solid-phase impregnation could be an effective method to modulate interface structure for designing efficient catalyst.

关键词： CeO_(2)/TiO_(2) NH_(3)-SCR Solid-phase impregnation Interfacial interaction NO induced incorporation

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激光微造型对粉末润滑界面边界层行为和润滑特性的影响

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摩擦学学报 2016年第3期36卷 332-340页

作者：季佳伟刘焜王伟合肥工业大学摩擦学研究所安徽合肥230009

粉末润滑在极端条件下可以有效地减摩,但粉末的介入性和界面保持性仍有待提高,研究尝试利用表面的激光微造型,阐明其对粉末润滑特性的影响,改善润滑特性.采用控制变量法,分别改变多功能摩擦磨损试验机的载荷和转速,使用形状测量激光显... 详细信息

粉末润滑在极端条件下可以有效地减摩,但粉末的介入性和界面保持性仍有待提高,研究尝试利用表面的激光微造型,阐明其对粉末润滑特性的影响,改善润滑特性.采用控制变量法,分别改变多功能摩擦磨损试验机的载荷和转速,使用形状测量激光显微系统观察载荷和转速对微造型表面摩擦特性的影响.结果表明:激光微造型表面相对于无微造型表面能承受更大的载荷和转速;激光微造型部位最先形成蝌蚪状界面边界层,在界面边界层损坏过程中,微造型凹坑部位界面边界层保留时间较长,出现蝌蚪状残留和圆坑残留现象;在一定范围内,表面粗糙度随着载荷和转速的增大而逐渐增大.

关键词：激光微造型粉末润滑载荷转速界面边界层

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