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Atomically Precise Design of PtSn Catalyst for the Understanding of the Role of Sn in Propane Dehydrogenation

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Precision Chemistry 2024年第6期2卷 245-255页

作者： Hui Ye Lina Cao Minghui Gu Han Nie Qingqing Gu Bing Yang Yunxing Bai Qinxue Nie weixin huang Junling Lu institute of Advanced Technology Key Laboratory of Precision and Intelligent ChemistryDepartment of Chemical PhysicsHefei National Research Center for Physical Sciences at the MicroscaleKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei 230026P.R.China CAS key laboratory of Science and Technology on Applied catalysis Dalian Institute of Chemical PhysicsThe Chinese Academy of SciencesDalian 116023P.R.China

Propane dehydrogenation(PDH),an atom-economic reaction to produce high-value-added propylene and hydrogen with high efficiency,has recently attracted extensive *** severe deactivation of Pt-based catalysts through sintering and coking remains a major challenge in this high-temperature *** introduction of Sn as a promoter has been widely applied to improve the stability and selectivity of the ***,the selectivity and stability of PtSn catalysts have been found to vary considerably with synthesis methods,and the role of Sn is still far from fully *** gain in-depth insights into this issue,we synthesized a series of PtSn/SiO_(2)and SnPt/SiO_(2)catalysts by varying the deposition sequence and Pt:Sn ratios using atomic layer deposition with precise *** found that PtSn/SiO_(2)catalysts fabricated by the deposition of SnO_(x)first and then Pt,exhibited much better propylene selectivity and stability than the SnPt/SiO_(2)catalysts synthesized the other way *** demonstrate that the presence of Sn species at the Pt-SiO_(2)interface is of essential importance for not only the stabilization of PtSn clusters against sintering under reaction conditions but also the promotion of charge transfers to Pt for high *** the above,the precise regulation of the Sn content is also pivotal for high performance,and the excess amount of Sn might generate additional acidic sites,which could decrease the propylene selectivity and lead to heavy coke *** findings provide deep insight into the design of highly selective and stable PDH catalysts.

关键词： Propane dehydrogenation PtSn catalysts sintering coke formation acidity

Morphology-Dependent catalysis of CeO_(2)-Based Nanocrystal Model Catalysts

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chinese Journal of Chemistry 2022年第15期40卷 1856-1866页

作者： Yang Wen Qiuyu huang Zhenhua Zhang weixin huang key laboratory of the Ministry of Education for Advanced catalysis Materials Zhejiang Key Laboratory for Reactive Chemistry on Solid SurfacesInstitute of Physical ChemistryZhejiang Normal UniversityJinhuaZhejiang 321004China Hefei National laboratory for Physical sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefeiAnhui 230026China dalian National laboratory for Clean Energy Chinese Academy of SciencesDalianLiaoning 116023China

Comprehensive Summary Recent progress in colloidal synthesis has realized the preparations of uniform nanocrystal(NC)model catalysts with rich and well-controlled morphologies that were employed to explore structure-activity relationships of powder catalysts,similar to single-crystal-based model catalysts under ultrahigh vacuum conditions but can work at the same conditions as powder catalysts without the"materials gap"and"pressure gap".In this perspective,the CeO_(2)-based NC model catalysts with various morphologies are included and their relevant progresses are critically *** detailed descriptions of morphology-controlled synthesis and characterizations of uniform CeO_(2)NCs.

关键词： CeO_(2)naocrystals Model catalysts Surface chemistry Heterogeneous catalysis Structure-activity relationships

Interaction of gas phase atomic hydrogen with Pt(111):Direct evidence for the formation of bulk hydrogen species

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Science china Chemistry 2007年第1期50卷 91-96页

作者： JIANG ZhiQuan huang weixin bao XinHe Department of chemical physics University of Science and Technology of ChinaHefei 230026China State key laboratory of catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Employing hot tungsten filament to thermal dissociate molecular hydrogen,we generated gas phase atomic hydrogen under ultra-high vacuum(UHV)conditions and investigated its interaction with Pt(111) *** desorption spectroscopy(TDS)results demonstrate that adsorption of molecular hy- drogen on Pt(111)forms surface Had species whereas adsorption of atomic hydrogen forms not only surface Had species but also bulk Had *** Had species is more thermal-unstable than surface Had species on Pt(111),suggesting that bulk Had species is more *** kind of weakly- adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions.

关键词： Pt(111)surface bulk H species thermal desorption spectroscopy

岷江干旱河谷土石混合边坡不同种植处理下乡土植被的生态效益

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生态学报 2024年第4期44卷 1647-1661页

作者：马少伟胡慧包维楷王子龙杨雨胡斌黄龙李芳兰中国科学院山地生态恢复与生物资源利用重点实验室生态恢复与生物多样性保育四川省重点实验室中国科学院成都生物研究所成都610041 中国科学院大学北京100049

岷江干旱河谷生态环境脆弱,植被恢复困难,大规模的公路建设极易对当地生态环境造成破坏。筛选适宜的植被恢复措施对干旱地区道路边坡的乡土植被恢复重建和生态功能提升尤为重要。以岷江干旱河谷极端退化的土石混合的道路边坡为案例,选... 详细信息

岷江干旱河谷生态环境脆弱,植被恢复困难,大规模的公路建设极易对当地生态环境造成破坏。筛选适宜的植被恢复措施对干旱地区道路边坡的乡土植被恢复重建和生态功能提升尤为重要。以岷江干旱河谷极端退化的土石混合的道路边坡为案例,选取乡土灌木和草本植物构建植物群落,进行裸地播种、播种后覆盖纤维毯和添加腐殖土后播种并地表覆盖纤维毯3种不同的种植处理,揭示了不同处理下群落结构、土壤改良以及水土保持效益的差异。发现,乡土灌草群落是干旱河谷适宜的道路边坡植被恢复模式,种植后第3年群落特征趋近于岷江干旱河谷区自然生态系统的多年生灌草植被。纤维毯覆盖+覆土处理在促进植物生长和群落构建,水土流失防治上效果最好,群落总盖度为74%,群落总生物量为506.35 g/m^(2);生长季内,与自然恢复相比小区径流量减少了87.8%,泥沙流失量降低了92.1%。土壤改良效应在3种处理之间差异不明显,但是与自然恢复样地相比,各处理均提升了边坡0-20 cm土层土壤养分。不同种植处理下植物群落结构差异是影响干旱河谷土石混合的道路边坡水土流失的关键因子。

关键词：干旱区道路边坡群落模式植被恢复乡土物种水土保持

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三七根中2个新成分

中草药 2024年第8期55卷 2503-2509页

作者：邱子健黄金莲保梅芬魏沣高慧媛肖蕾蔡祥海中国科学院昆明植物研究所植物化学与西部植物资源持续利用国家重点实验室云南昆明650201 无限极(中国)有限公司广东广州510623 沈阳药科大学中药学院辽宁沈阳110016

目的进一步研究三七Panax notoginseng干燥根的化学成分。方法采用大孔吸附树脂、硅胶柱、C_(18)反相硅胶柱、Sephadex LH-20凝胶等方法进行成分分离,再依据理化性质和波谱数据对化合物进行结构鉴定。结果从三七干燥根70%乙醇提取物中... 详细信息

目的进一步研究三七Panax notoginseng干燥根的化学成分。方法采用大孔吸附树脂、硅胶柱、C_(18)反相硅胶柱、Sephadex LH-20凝胶等方法进行成分分离,再依据理化性质和波谱数据对化合物进行结构鉴定。结果从三七干燥根70%乙醇提取物中分离得到11个化合物,包括萜类5个、吡喃酮类3个、呋喃酮类1个、酚苷类1个、其他类1个,分别鉴定为(S)-2-乙基-6-羟基-7-甲氧基苯酞-6-α-L-鼠李糖基-(1→6)-β-D-吡喃葡萄糖苷(1)、△^(8(9))-(Z)-(R)-6-(1-羟基己基)-4-甲氧基-2(5H)-吡喃酮(2)、6-(1-羟基戊基)-4-甲氧基-2(5H)-吡喃酮(3)、6-(1-羟基己基)-5-羟基-3-甲氧基-2(5H)-吡喃酮(4)、4β,10α-香木兰烷二醇(5)、异胡萝卜-6-烯-10β,14-二醇(6)、4(15)-桉叶烯-1β,6α-二醇(7)、两面针碱D(8)、两面针碱C(9)、5-(1-羟基庚基)-3-甲氧基-2(5H)-呋喃酮(10)、3E-5-甲氧基-6-羟基-6-甲基-3-庚烯-2-酮(11)。结论化合物1、2为新化合物,分别命名为三七酚酞苷和三七己烯吡喃酮。化合物6、8、9、11为首次从该植物中分离。

关键词：三七酚苷类吡喃酮类萜类三七酚酞苷三七己烯吡喃酮异胡萝卜-6-烯-10β 14-二醇两面针碱D

Two-dimensional materials for future information technology: status and prospects

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Science china(Information sciences) 2024年第6期67卷 1-147页

作者： Hao QIU Zhihao YU Tiange ZHAO Qi ZHANG Mingsheng XU Peifeng LI Taotao LI Wenzhong bao Yang CHAI Shula CHEN Yiqi CHEN Hui-Ming CHENG Daoxin DAI Zengfeng DI Zhuo DONG Xidong DUAN Yuhan FENG Yu FU Jingshu GUO Pengwen GUO Yue HAO Jun HE Xiao HE Jingyi HU Weida HU Zehua HU Xinyue huang Ziyang huang Ali IMRAN Ziqiang KONG Jia LI Qian LI Weisheng LI Lei LIAO Bilu LIU Can LIU Chunsen LIU Guanyu LIU Kaihui LIU Liwei LIU Sheng LIU Yuan LIU Donglin LU Likuan MA Feng MIAO Zhenhua NI Jing NING Anlian PAN Tian-Ling REN Haowen SHU Litao SUN Yue SUN Quanyang TAO Zi-Ao TIAN Dong WANG Hao WANG Haomin WANG Jialong WANG Junyong WANG Wenhui WANG Xingjun WANG Yeliang WANG Yuwei WANG Zhenyu WANG Yao WE... School of Electronic Science and Engineering Nanjing University School of Integrated Circuits Interdisciplinary Research Center for Future Intelligent Chips (Chip-X)Nanjing University School of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications State key laboratory of Infrared physics Shanghai Institute of Technical Physics Chinese Academy of Sciences School of physics and key Lab of Quantum Materials and Devices of the Ministry of Education School of Electronic Science & EngineeringSoutheast University College of Integrated Circuits State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Suzhou laboratory State key laboratory of Integrated Chips and Systems School of MicroelectronicsFudan University Shaoxin laboratory Department of Applied physics The Hong Kong Polytechnic University key laboratory for Micro-Nano physics and Technology of Hunan Province College of Materials Science and EngineeringHunan University College of Integrated Circuits Zhejiang University Shenzhen Geim Graphene Center Shenzhen Key Laboratory of Layered Materials for Value-Added ApplicationsTsinghua-Berkeley Shenzhen Institute & Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua University State key laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZijingang CampusZhejiang University National key laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences CAS key laboratory of Nanophotonic Materials and Devices & key laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinese Academy of Sciences College of Chemistry and chemical Engineering Hunan University key laboratory of Quantum State Construction and Manipulation (Ministry of Education) Department of PhysicsRenmin University of China School

Over the past 70 years, the semiconductor industry has undergone transformative changes,largely driven by the miniaturization of devices and the integration of innovative structures and materials. Two-dimensional(2D) materials like transition metal dichalcogenides(TMDs) and graphene are pivotal in overcoming the limitations of silicon-based technologies, offering innovative approaches in transistor design and functionality, enabling atomic-thin channel transistors and monolithic 3D integration. We review the important progress in the application of 2D materials in future information technology, focusing in particular on microelectronics and optoelectronics. We comprehensively summarize the key advancements across material production, characterization metrology, electronic devices, optoelectronic devices, and heterogeneous integration on silicon. A strategic roadmap and key challenges for the transition of 2D materials from basic research to industrial development are outlined. To facilitate such a transition, key technologies and tools dedicated to 2D materials must be developed to meet industrial standards, and the employment of AI in material growth, characterizations, and circuit design will be essential. It is time for academia to actively engage with industry to drive the next 10 years of 2D material research.

关键词： two-dimensional (2D) materials information technology production technology standardization of characterization microelectronicdevices optoelectronic devices multi-functional integration

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稻瘟病菌MoZds1的功能分析

浙江农业学报 2024年第3期36卷 559-568页

作者：黄昌丽朱学明李琳鲍坚东俞晓平林福呈中国计量大学生命科学学院浙江杭州310018 农产品质量安全危害因子与风险防控国家重点实验室浙江省农业科学院植物保护与微生物研究所浙江杭州310021

由稻瘟病菌引起的水稻稻瘟病对中国水稻产量造成了严重威胁,开展稻瘟病菌功能基因的研究有利于更好地了解稻瘟病菌致病机制,为稻瘟病的防治奠定基础。研究前期通过遗传学手段在稻瘟病菌中筛选到一个酵母ZDS1同源基因MoZDS1。通过基因敲... 详细信息

由稻瘟病菌引起的水稻稻瘟病对中国水稻产量造成了严重威胁,开展稻瘟病菌功能基因的研究有利于更好地了解稻瘟病菌致病机制,为稻瘟病的防治奠定基础。研究前期通过遗传学手段在稻瘟病菌中筛选到一个酵母ZDS1同源基因MoZDS1。通过基因敲除方法成功获得基因缺失突变体ΔMozds1,发现缺失MoZDS1严重影响稻瘟病菌营养生长。为探究MoZds1在稻瘟病菌中的具体功能,通过生物信息学分析、生长测定、产孢量分析、细胞壁胁迫分析以及自噬流检测等方法,分析了MoZds1在维持营养生长、产孢、应对细胞壁胁迫以及细胞自噬方面的作用。结果表明,MoZds1正调控稻瘟病菌菌丝生长,负调控孢子的形成。此外,MoZds1参与细胞壁完整性途径并调控孢子内糖原的降解速率,然而,MoZds1的缺失未表现出对细胞自噬途径的显著影响。该研究对稻瘟病菌MoZds1的功能进行了系统地分析,或为后续更深入研究MoZds1的功能提供了理论基础。

关键词：稻瘟病菌气生菌丝细胞壁完整性细胞自噬

玉米-大豆轮作体系下连续4年增施有机肥对玉米产量和子粒品质的影响

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玉米科学 2024年第1期32卷 130-140页

作者：包文彬王春雨谢志煌李彦生张兴义刘晓冰东北农业大学资源与环境学院哈尔滨150030 中国科学院东北地理与农业生态研究所/黑土区农业生态重点实验室哈尔滨150081 黑龙江北大荒农业股份有限公司八五四分公司黑龙江虎林158403

利用典型黑土区玉米-大豆轮作定位试验,设5个处理,即不施肥(NoF)、玉米连作正常施用化肥(LZ)、玉米-大豆轮作正常施用化肥(CF)、玉米-大豆轮作正常施用化肥+15000 kg/hm^(2)有机肥(CF+15T)和玉米-大豆轮作正常施用化肥+30000 kg/hm^(2)... 详细信息

利用典型黑土区玉米-大豆轮作定位试验,设5个处理,即不施肥(NoF)、玉米连作正常施用化肥(LZ)、玉米-大豆轮作正常施用化肥(CF)、玉米-大豆轮作正常施用化肥+15000 kg/hm^(2)有机肥(CF+15T)和玉米-大豆轮作正常施用化肥+30000 kg/hm^(2)有机肥(CF+30T),研究连续4年增施有机肥后对玉米产量及构成要素和子粒中蛋白质、氨基酸、可溶性糖、淀粉、矿质营养元素含量的影响。结果表明,同CF处理相比,LZ处理玉米产量比CF处理降低15%,连续4年增施有机肥后玉米产量呈增加趋势,CF+15T处理和CF+30T处理玉米产量比CF处理高8.8%和13%。单施化肥处理下连作与轮作玉米子粒品质指标差异不大,轮作处理后连续4年增施有机肥处理的玉米子粒中游离氨基酸、可溶性糖和淀粉含量随着施用有机肥的量增加而增加,对玉米子粒蛋白质含量影响不大。同LZ和CF处理相比,连续4年增施有机肥显著提高玉米子粒中K、Na、Mg和P含量,Ca、Mn、Fe和Zn含量无显著变化。因此,黑土区玉米连作减产,对品质影响不大。玉米-大豆轮作制度下连续4年增施15000 kg/hm^(2)有机肥提高玉米产量,是促进子粒淀粉、游离氨基酸、可溶性糖、K、Na、Mg和P积累的有效措施之一。

关键词：玉米玉米-大豆轮作增施有机肥营养品质

Morphology-dependent structures and catalytic performances of Au nanostructures on Cu_2O nanocrystals synthesized by galvanic replacement reaction

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Journal of Energy Chemistry 2016年第6期25卷 1086-1091页

作者： Zhenhua Zhang Rui Song Tian Cao weixin huang Hefei National laboratory for Physical sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics University of Science and Technology of China

Au nanostructures were prepared on uniform Cu2O octahedra and rhombic dodecahedra via the galvanic replacement reaction between HAuCl 4 and Cu2O. The compositions and structures were studied by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), High-Resolution Transmission Electron Microscope (HRTEM), X-Ray Diffraction (XRD), X-Ray Absorption Spectroscopy (XAS), X-ray Photoelectron Spectroscopy (XPS) and in-situ DRIFTS spectroscopy of CO adsorption. Different from the formation of Au-Cu alloys on Cu2O cubes by the galvanic replacement reaction (ChemNanoMat 2 (2016) 861-865), metallic Au particles and positively-charged Au clusters form on Cu2O octahedra and rhombic dodecahedra at very small Au loadings and only metallic Au particles form at large Au loadings. Metallic Au particles on Cu2O octahedra and rhombic dodecahedra are more active in catalyzing the liquid phase aerobic oxidation reaction of benzyl alcohol than positively-charged Au clusters. These results demonstrate an obvious morphology effect of Cu2O nanocrystals on the liquid-solid interfacial reactions and prove oxide morphology as an effective strategy to tune the surface reactivity and catalytic performance. (C) 2016 Science Press and dalian institute of chemical physics, chinese academy of sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Au/Cu2O nanocomposites Galvanic replacement reaction Liquid-solid interfacial reaction Crystal plane effect Aerobic oxidation of benzyl alcohol