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doping effect of rare earth metal ions Sm^(3+),Nd^(3+)and Ce^(4+)on denitration performance of MnO_(x) catalyst in low temperature NH_(3)-SCR reaction

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Journal of Rare Earths 2023年第9期41卷 1323-1335,I0002页

作者： Jing Rong Wanxia Zhao Wen Luo Keke Kang Lulu Long Yang Chen Xiaojiang Yao Research Center for Atmospheric Environment Key Laboratory of Reservoir Aquatic Environment of CASChongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China College of Resources and Environment Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chongqing 400714China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing400067China

The MnXO_(x) catalysts(i.e.,MnSmO_(x),MnNdO_(x),MnCeO_(x)) were prepared by reverse co-precipitation method and used for NH_(3)-SCR *** is found that MnCeO_(x) catalyst presents the best low tempe rature catalytic activity(higher than 90% NO_(x) conversion in the te mperature range from 125 to 225℃)and excellent H_(2)O+SO_(2) *** order to explore the reason for this result,the characterization of X-ray diffraction(XRD),Raman spectroscopy,Brunauer-Emmett-Teller(BET),H_(2)-temperature programmed reduction(H_(2)-TPR),NH_(3)-temperature programmed desorption(NH_(3)-TPD),X-ray photoelectron spectroscopy(XPS) and in situ diffuse reflaxions infrared Fourier transformations spectroscopy(DRIFTS) were *** obtained results suggest that MnCeO_(x) catalyst shows the largest amount of acid sites and the best reducibility among these MnXO_(x) ***,Ce^(4+) doping inhibits the crystallization of MnO_(x) catalyst and shows the largest specific surface ***,in situ DRIFTS experiments reveal that NH_(3)-SCR reaction over MnCeO_(x) catalyst follows both Langmuir-Hinshelwood(LH) and Eley-Rideal(E-R) mechanisms,which is through "fast SCR" reaction.

关键词： Low temperature NH_(3)-SCR reaction MnO_(x)catalyst Rare earth doping effect

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doping effect of cations(Zr^(4+),Al^(3+),and Si^(4+)) on MnO_x/CeO_2 nano-rod catalyst for NH_3-SCR reaction at low temperature

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Chinese Journal of Catalysis 2019年第5期40卷 733-743页

作者： Xiaojiang Yao Jun Cao Li Chen Keke Kang Yang Chen Mi Tian Fumo Yang Research Center for Atmospheric Environment Key Laboratory of Reservoir Aquatic Environment of CAS Chongqing Institute of Green and IntelligentTechnology Chinese Academy of Sciences Chongqing 400714 China National Engineering Research Center for Flue Gas Desulfurization School of Architecture and Environment Sichuan University Chengdu 610065Sichuan China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 Fujian China

Thermally stable Zr4+, Al3+, and Si4+ cations were incorporated into the lattice of CeO2 nano‐rods (i.e., CeO2‐NR) in order to improve the specific surface area. The undoped and Zr4+, Al3+, and Si4+ doped nano‐rods were used as supports to prepare MnOx/CeO2‐NR, MnOx/CZ‐NR, MnOx/CA‐NR, and MnOx/CS‐NR catalysts, respectively. The prepared supports and catalysts were comprehensively characterized by transmission electron microscopy (TEM), high‐resolution TEM, X‐ray diffraction, Raman and N2‐physisorption analyses, hydrogen temperature‐programmed reduction, ammonia temperature‐programmed desorption, in situ diffuse reflectance infrared Fourier‐transform spectroscopic analysis of the NH3 adsorption, and X‐ray photoelectron spectroscopy. Moreover, the catalytic performance and H2O+SO2 tolerance of these samples were evaluated through NH3‐selective catalytic reduction (NH3‐SCR) in the absence or presence of H2O and SO2. The obtained results show that the MnOx/CS‐NR catalyst exhibits the highest NOx conversion and the lowest N2O concentration, which result from the largest number of oxygen vacancies and acid sites, the highest Mn4+ content, and the lowest redox ability. The MnOx/CS‐NR catalyst also presents excellent resistance to H2O and SO2. All of these phenomena suggest that Si4+ is the optimal dopant for the MnOx/CeO2‐NR catalyst.

关键词： MnOx/CeO2 nano‐rod catalyst doping effect Oxygen vacancy Surface acidity Low‐temperature NH3‐SCR reaction

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Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides

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Chinese Chemical Letters 2024年第9期35卷 193-197页

作者： Jaeyong Ahn Zhenping Li Zhiwei Wang Ke Gao Huagui Zhuo Wanuk Choi Gang Chang Xiaobo Shang Joon Hak Oh School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826South Korea State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Center for Ordered Nanoporous Materials Synthesis School of Environmental Science and EngineeringPohang University of Science and TechnologyGyeongbuk 37673South Korea Instrumental Analysis Center of Xi’an Jiaotong University Xi’an 710049China

Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free ***,the development of n-type semiconductors has lagged behind p-type *** enhance semiconductor device performance,a doping process can be employed,which typically involves the introduction of charged impurities into the crystalline semiconducting *** aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ultimately enhancing the electrical properties of the *** doping processes,however,often pose a risk of damaging the structure of single *** this study,we have synthesized novel cyanosubstituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor *** have employed a surface doping strategy using diethylamine vapor without disrupting the crystal *** fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm^(2)V^(-1)s^(-1),representing an improvement of over ***,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response *** results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs.

关键词： doping effect Phototransistors Perylene diimides Organic crystals Cyano substitution

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doping effect on Grain Growth of Spinel LiMn2O4 Prepared by Sol-Gel Methods

Doping Effect on Grain Growth of Spinel LiMn2O4 Prepared by ...

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第14届全国晶体生长与材料学术会议

作者： ZUO Xiang-Qing, LI Huai-Xiang**, ZHOU Hong-Wei, XIA Rong-Hua (Department of Chemistry, Shandong Normal University, Jinan 250014 China)

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Nitrogen doping effect in a-Ge:H Films Due To High Hydrogen Dilution

Nitrogen Doping Effect in a-Ge:H Films Due To High Hydrogen ...

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1996年中国青年学者物理学讨论会

作者： Seiiehi Miyazaki Masataka Hirose Dept.of Electrical Engineering Hiroshima University Higashi-Hiroshima 739Japan

A series of a-Ge:N:H films have been produced by employing d glow discharge decomposition of hydrogen-dilutd gas mixutres of NH and *** was found that hydrogen dilution induces the decrease of the nitrogen content in the films and the corresponding optical band gap is also rapidly *** dramatic increase of eonduetivity was explained in terms of the nitrogen doping effect.

关键词： amorphous germanium nitrogen doping effect

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effect of CuO doping on the Electrical Behavior of ZrO2

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Chinese Journal of Chemistry 2007年第8期25卷 1112-1115页

作者： SABA Beg SARITA POOJA Varshney Department of Chemistry Aligarh Muslim University Aligarh 202002 India

Electrical conductivity has been measured at different temperatures for ZrO2 doped with various molar ratios of CuO. The conductivity increases due to migration of vacancies, created by doping. The conductivity was found to increase with increase in temperature till 220℃ and thereafter decrease due to collapse of the fluorite framework. A second rise in conductivity around 500 ℃ was observed due to phase transition of ZrO2. X-ray powder diffraction, DTA and IR studies were carried out for confirming doping effect and phase transition in ZrO2.

关键词： oxide doping effect electrical conductivity XRD

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doping effects of manganese on the catalytic performance and structure of NiMgO catalysts for controllabe synthesis of multi-walled carbon nanotubes

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Journal of Energy Chemistry 2014年第6期23卷 781-788页

作者： Maofei Ran Wei Chu Yan Liu Dong Liu Chang Zhang Jiae Zheng College of Chemistry & Environment Protection Engineering Southwest University for Nationalities Institute of Chemical and Engineering Sciences (ICES) A*STAR 627833 Singapore College of Chemical Engineering Sichuan University

doping effects of manganese （Mn） on catalytic performance and structure evolution of NiMgO catalysts for synthesis of multi-walled carbon nanotubes （MWCNTs） from methane were investigated for the first time. Addition of Mn in NiMgO catalyst can greatly improve the MWCNTs yield. Mno.2NiMgO catalyst among the tested ones gives the highest MWCNTs yield as 2244%, which is two times higher than that of the catalyst without Mn. The structure evolution, reduction behaviors and surface chemical properties of MnNiMgO catalysts with various Mn contents were studied in detail. It was found that the stable solid solution of NiMgO2 formed in NiMgO catalyst was disturbed by the addition of Mn. Instead, another solid solution of MnMg608 is formed. More amount of Ni can be reduced and dispersed on the catalyst surface to be acted as active sites. Importantly, the changes of Ni content on the surface are correlated with the Ni particle size and the outer diameter of MWCNTs, suggesting the controllable synthesis of MWCNTs over MnNiMgO catalysts.

关键词： doping effect manganese NiMgO catalyst controllable synthesis carbon nanotubes

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doping of group IVB elements for nickel-rich cobalt-free cathodes

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Journal of Energy Chemistry 2023年第11期86卷 559-568,I0012页

作者： Shengnan Guo Xincheng Lei Jiayi Wang Jie Su Yingying Wang Xiaozhi Liu Pengxiang Ji Kangning Zhao Xuefeng Wang Lin Gu Zhenpeng Yao Dong Su National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Hetero-element doping is a promising strategy to improve the cycling stability of nickel-rich cobalt-free cathodes for the next-generation high energy-density Li ion *** make doping effective,it is important to understand the mechanism of how the dopants regulate the electronic band,lattice parameter adjusting,or hetero-phase formation to achieve high *** this study,we investigate LiNi_(0.9)Mn_(0.1)O_(2)cathodes doped with IVB grouping elements via multiple characterization *** utilizing in situ XRD and TEM methods,we found that the stronger Ti-O bond effectively improves the cathode stability via a dual protection ***,the bulk lattice of cathode is wellpreserved during cycling as a result of the suppressed H_(2)-H_(3)phase transition,while a in situ formed Ti-rich surface layer can prevent continuous surface *** a result,the 5%Ti doped LiNi_(0.9)Mn_(0.1)O_(2)cathode exhibits a high capacity retention of 96%after 100 ***,despite IVB group elements Zr and Hf have stronger bonding energy with oxygen,their larger ionic radii actually impede their diffusion into the cathode,thereby they can not improve the cycling *** findings uncover the functional origin of doped elements with their dynamic modification on cathode structure,providing mechanistic insights into the design of nickel-rich cobalt-free cathodes.

关键词： Li ion battery Layered cathode Cycling stability doping effect In situXRD

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Selective core-shell doping enabling high performance 4.6 V-LiCoO_(2)

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Journal of Energy Chemistry 2024年第8期95卷 684-693,I0015页

作者： Yueming Xia Jianrui Feng Jinhui Li Yan Li Zhengfeng Zhang Xiaoqi Wang Jianli Shao Manling Sui Pengfei Yan Beijing Key Laboratory of Microstructure and Property of Solids College of Materials Science&EngineeringBeijing University of TechnologyBeijing 100124China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO_(2)(LCO).Herein,we manage to synthesize a surface Mg-doping and bulk Al-doping coreshell structured LCO,which demonstrates excellent cycling ***-cell shows 94.2%capacity retention after 100 cycles at 3.0-4.6 V(***/Li^(+))cycling,and no capacity decay after 300 cycles for fullcell test(3.0-4.55 V).Based on comprehensive microanalysis and theoretical calculations,the degradation mechanisms and doping effects are systematically *** the undoped LCO,high voltage cycling induces severe interfacial and bulk degradations,where cracks,stripe defects,fatigue H2 phase,and spinel phase are identified in grain *** the doped LCO,Mg-doped surface shell can suppress the interfacial degradations,which not only stabilizes the surface structure by forming a thin rock-salt layer but also significantly improves the electronic conductivity,thus enabling superior rate *** Al-doping can suppress the lattice"breathing"effect and the detrimental H3 to H1-3 phase transition,which minimizes the internal strain and defects growth,maintaining the layered structure after prolonged *** theoretical calculations,this work deepens our understanding of the doping effects of Mg and Al,which is valuable in guiding the future material design of high voltage LCO.

关键词： Lithium-ion battery doping effect Failure mechanism High-voltage LiCoO_(2) Electron microscopy

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Bi（Ph，M）SrCaCuO体系的掺杂效应

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陕西师范大学学报(自然科学版) 1994年第3期 89-90页

作者：卢亚锋辛绵荣罗长勋陕西师范大学物理学系

Ｂｉ（Ｐｈ，Ｍ）ＳｒＣａＣｕＯ体系的掺杂效应卢亚锋，辛绵荣，罗长勋（陕西师范大学物理学系，西安ｎ００６２；第一作者，男，３０岁，助教）元素掺杂是探索高温超导电性机理和材料物理研究的重要途径之一．我们在Ｐｂ部分替换Ｂｉ... 详细信息

Ｂｉ（Ｐｈ，Ｍ）ＳｒＣａＣｕＯ体系的掺杂效应卢亚锋，辛绵荣，罗长勋（陕西师范大学物理学系，西安ｎ００６２；第一作者，男，３０岁，助教）元素掺杂是探索高温超导电性机理和材料物理研究的重要途径之一．我们在Ｐｂ部分替换Ｂｉ的基础上，分别用Ｓｂ，Ｓｎ，Ｉｎ作...

关键词： doping effect superconductivity hyperthermia

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