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Boosting propane dehydrogenation by gallium hydride species formed in situ

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Science China Chemistry 2024年第6期67卷 1753-1755页

作者： Evgenii V.Kondratenko Leibniz-Institut für Katalyse e.V. Albert-Einstein-Str.29aRostock18059Germany

An inspiring paper recently published in Nature Chemistry[1]by the group of *** Gong at Tianjin University is the motivation for this highlight *** reported results show that the understanding of reaction-induced restructuring of heterogeneous catalysts is of great importance for their targeted development because usually unstable compounds can be formed and stabilized under reaction conditions.

关键词： conditions hydride stabilized

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Dinitrogen fixation mediated by lanthanum hydride

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Journal of Energy Chemistry 2022年第9期31卷 1-7,I0001页

作者： Hanxue Yan Wenbo Gao Jirong Cui Weijin Zhang Qijun Pei Qianru Wang Yeqin Guan Sheng Feng Han Wu Hujun Cao Jianping Guo Ping Chen Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Dinitrogen fixation is one of the key reactions in chemistry, which is closely associated with food, environment, and energy. It has been recently recognized that the hydride materials containing negatively charged hydrogen(H~-) show promises for Nfixation and hydrogenation to ammonia. Herein, we report that rare earth metal hydrides such as lanthanum hydride can also fix Neither by heating to 200 °C or ball milling under ambient Npressure and temperature. The Nfixation by lanthanum hydride may proceed via an intermediate lanthanum hydride-nitride(La-H-N) structure to form the final lanthanum nitride product. The hydride ion functions as an electron donor, which provides electrons for Nactivation possibly mediated by the lanthanum atoms. It is observed that N–H bond is not formed during the Nfixation process, which is distinctly different from the alkali or alkaline earth metal hydrides. The hydrolysis of La-H-N to ammonia is feasible using water as the hydrogen source. These results provide new insights into the nitrogen fixation by hydride materials and more efforts are needed for the development of rare earth metal-based catalysts and/or nitrogen carriers for ammonia synthesis processes.

关键词： hydride Lanthanum hydride Nitrogen fixation Lanthanum hydride-nitride Rare earth metal hydride

Physical Origin of Color Changes in Lutetium hydride under Pressure

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Chinese Physics Letters 2023年第11期40卷 120-125页

作者：吕润涂文倩邵定夫孙玉平鲁文建 Key Laboratory of Materials Physics Institute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China High Magnetic Field Laboratory Institute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Collaborative Innovation Center of Microstructures Nanjing UniversityNanjing 210093China

Recently,near-ambient superconductivity was claimed in nitrogen-doped lutetium hydride(LuH_(3-δ)N_(ε)).Unfortunately,all follow-up research still cannot find superconductivity signs in successfully synthesized lutetium dihydride(LuH_(2)) and N-doped LuH_(2±x)N_(y).However,a similar intriguing observation was the pressure-induced color changes(from blue to pink and subsequent red).The physical understanding of its origin and the correlation between the color,crystal structure,and chemical composition of Lu–H–N is still *** this work,we systematically investigated the optical properties of LuH_(2) and LuH_(3),and the effects of hydrogen vacancies and nitrogen doping using the first-principles calculations by considering both interband and intraband *** results demonstrate that the evolution of reflectivity peaks near blue and red light,which is driven by changes in the band gap and Fermi velocity of free electrons,resulting in the blue-to-red color change under *** contrast,LuH_(3) exhibits gray and no color change up to 50 ***,we investigated the effects of hydrogen vacancies and nitrogen doping on its optical *** vacancies can significantly decrease the pressure of blue-to-red color change in LuH_(2) but do not have a noticeable effect on the color of LuH_(3).The N-doped LuH_(2) with the substitution of a hydrogen atom at the tetrahedral position maintains the color change when the N-doping concentration is *** the doping level increases,this trend becomes less obvious,while other N-doped structures do not show a blue-to-red color *** results can clarify the origin of the experimental observed blue-to-red color change in lutetium hydride and also provide a further understanding of the potential N-doped lutetium dihydride.

关键词： hydride doping Origin

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

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Journal of Materials Science & Technology 2022年第8期103卷 105-112页

作者： Qian Wang Shun Xu Yajun Zhao Jean-Sébastien Lecomte Christophe Schuman Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux(LEM3) Universitéde Lorraine CNRSArts et Métiers ParisTechMetz57073France Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures(DAMAS) University of Lorraine57073France School of Iron and Steel Soochow UniversitySuzhou 215021China School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116021China

The dominant hydride precipitates have been well demonstrated to follow two types of orientation relationships(ORs)with Ti matrix:OR1 with{0001}//{001},//and OR2 with{0001}//{111},//.Within the grains with special orientations,the complicated interactions of different hydride variants inside Ti-hydride diffusion layer are characterized in this *** OR1 hydride layer,the orientations of{1010}plane parallel to the sample surface and a-axis parallel to the normal direction prefer multiple OR1 *** orientations favorable for OR2 hydride layer are:{1013}plane parallel to sample surface corresponding to the layer with one OR2 variant dominated and c-axis parallel to the surface normal with multiple OR2 variant layer ***,{1012}extension twins and{1122}contraction twins are activated to accommodate the OR2 hydride-induced surface expansion and local misfit *** stimulation of these two twins is also orientation-dependent:{1012}and{1122}twins are observed in the grains with c-axis parallel to and deviated from the surface normal,*** further variant selection for each twin mode is performed through shear accommodation of hydride-twin pairs.

关键词： Titanium hydride Cross section Twin Variant selection

Photothermal-chemical synthesis of P-S-H ternary hydride at high pressures

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Chinese Physics B 2022年第6期31卷 650-655页

作者：叶婷婷曾鸿程鹏姚德元潘孝美张晓丁俊峰 Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The recent discovery of room temperature superconductivity(283 K)in carbonaceous sulfur hydride(C-S-H)has attracted much interest in ternary hydrogen rich *** this report,ternary hydride P-S-H was synthesized through a photothermal-chemical reaction from elemental sulfur(S),phosphorus(P)and molecular hydrogen(H_(2))at high pressures and room *** spectroscopy under pressure shows that H_(2)S and PH_(3) compounds are synthesized after laser heating at 0.9 GPa,and a ternary van der Waals compound P-S-H is synthesized with further compression to 4.6 *** P-S-H compound is probably a mixed alloy of PH_(3) and(H_(2)S)_(2)H_(2) with a guest-host structure similar to the C-S-H *** ternary hydride can persist up to 35.6 GPa at least and shows two phase transitions at approximately 23.6 GPa and 32.8 GPa,respectively.

关键词： hydride superconductor high pressure Raman spectroscopy

Diastereoselective construction of structurally diverse 2,3-dihydroquinolin-4-one scaffolds via redox neutral cascade[1,7]-hydride transfer/cyclization

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Organic Chemistry Frontiers 2022年第3期9卷 660-666页

作者： Ronghao Xie Shixiao Chen Xianping Xiang Xiangcong Yin Lubin Xu Shuai-Shuai Li Liang WangFengying Dong College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural UniversityChangcheng Rd.#700Qingdao266109P.R.China Key Laboratory of Marine Drugs Chinese Ministry of EducationSchool of Medicine and PharmacyOcean University of ChinaYushan Rd.#5Qingdao266003P.R.China Peking University science park No.127North Street of ZhongguancunBeijing100080P.R.China Hematology Diagnosis Laboratory The Affiliated Hospital of Qingdao UniversityQingdao266003P.R.China

The pharmaceutically significant 2,3-dihydroquinolin-4-one scaffolds were constructed diastereoselectively and facilely via redox-neutral cascade Knoevengel condensation/[1,7]-hydride transfer/cyclization/transesterification in DCE from readily available methyl 2-aminobenzoacetate and diverse aldehydes,which features novel and highly valuable product structures.

关键词： hydride neutral cyclization

Molecular Opacity Calculations for Lithium hydride at Low Temperature

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Chinese Physics Letters 2020年第12期37卷 24-30页

作者：梁桂颖彭裔耕李瑞吴勇王建国 Institute of Applied Physics and Computational Mathematics Beijing 100088China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Department of Physics College of ScienceQiqihar UniversityQiqihar 161006China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China

The opacities of the lithium hydride molecule are calculated for temperatures of 300 K,1000 K,1500 K,and 2000 K,at a pressure of 10 atm,in which the contributions from the five low-lying electronic states are *** ab initio multi-reference single and double excitation configuration interaction(MRDCI)method is applied to compute the potential energy curves(PECs)of the 7 LiH,including four 1∑+states and one 1Πstate,as well as the corresponding transition dipole moments between these *** ro-vibrational energy levels are calculated based on the PECs obtained,together with the spectroscopic *** addition,the partition functions are also computed,and are provided at temperatures ranging from 10 K to 2000 K for 7 LiH,7 LiD,6 LiH,and 6 LiD.

关键词： Lithium hydride partition

Synthesis of surface controlled nickel/palladium hydride nanodendrites with high performance in benzyl alcohol oxidation

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Nano Research 2019年第6期12卷 1467-1472页

作者： Zipeng Zhao Michelle M.Flores Espinosa Jihan Zhou Wang Xue Xiangfeng Duan Jianwei Miao Yu Huang Department of Materials Science and Engineering University of CaliforniaLos AngelesCA 90095USA Department of Physics and Astronomy University of CaliforniaLos AngelesCA 90095USA Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA California Nanosystems Institute University of CaliforniaLos AngelesCA 90095USA

Benzaldehyde byproduct is an imperative intermediate in the production of fine chemicals and *** selectivity to benzaldehyde is therefore critical in alcohol oxidation reactions at the industrial ***,we report a simple but innovative method for the synthesis of palladium hydride and nickel palladium hydride nanodendrites with controllable morphology,high stability,and excellent catalytic *** synthesized dendrites can maintain the palladium hydride phase even after their use in the chosen catalytic ***,the high surface area morphology and unique interaction between nickel-rich surface and palladium hydride (β-phase) of these nanodendrites are translated in an enhanced catalytic activity for benzyl alcohol oxidation *** Ni/PdH0.43 nanodendrites demonstrated a high selectivity towards benzaldehyde of about 92.0% with a conversion rate of 95.4%,showing higher catalytic selectivity than their PdH0.43 counterparts and commercial Pd/*** present study opens the door for further exploration of metal/metal-hydride nanostructures as next-generation catalytic materials.

关键词： benzyl alcohol selectivity benzaldehyde palladium hydride oxidation nanodendrites

Effect of Reactor Pressure on Qualities of GaN Layers Grown by hydride Vapour Phase Epitaxy

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Chinese Physics Letters 2007年第5期24卷 1390-1392页

作者：邱凯尹志军李新化钟飞姬长建韩奇峰曹先存陈家荣罗向东王玉琦 Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 Jiangsu Provincial Key Lab of ASIC Design Nantong University Nantong 226007

The influence of reactor pressure on GaN layers grown by hydride vapour phase epitaxy （HVPE） is investigated. By decreasing the reactor pressure from0. 7 to 0.5 mm, the GaN layer growth mode changes from the island-like one to the step flow. The improvements in structural and optical properties and surface morphology of GaN layers are observed in the step flow growth mode. The results clearly indicate that the reactor pressure, similarly to the growth temperature, is One of the important parameters to influence the qualities of GaN epilayers grown by HVPE, due to the change of growth mode.

关键词： Pressure Layers hydride