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Finned Zn-MFI zeolite encapsulated noble metal nanoparticle catalysts for the oxidative dehydrogenation of propane with carbon dioxide

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Journal of Energy Chemistry 2023年第5期80卷 479-491,I0011页

作者： En-Hui Yuan Yiming Niu Xing Huang Meng Li Jun Bao Yong-Hong Song Bingsen Zhang Zhao-tie liu Marc-Georg Willinger Zhong-Wen liu Key Laboratory of Syngas Conversion of Shaanxi Province School of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi'an 7119ShaanxiChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina College of Chemistry Fuzhou UniversityFuzhou 36108FujianChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026AnhuiChina School of Natural Science(NAT) Department of ChemistryTechnical University of MunichLichtenbergstraje 485747 GarchingGermany

Oxidative dehydrogenation of propane with carbon dioxide(CO_(2)-ODP)characterizes the tandem dehydrogenation of propane to propylene with the reduction of the greenhouse gas of CO_(2)to valuable ***,the existing catalyst is limited due to the poor activity and stability,which hinders its ***,we design the finned Zn-MFI zeolite encapsulated noble metal nanoparticles(NPs)as bifunctional catalysts(NPs@Zn-MFI)for CO_(2)-*** results reveal that the Zn2+species are coordinated with the MFI zeolite matrix as isolated cations and the NPs of Pt,Rh,or Rh Pt are highly dispersed in the zeolite *** isolated Zn2+cations are very effective for activating the propane and the small NPs are favorable for activating the CO_(2),which synergistically promote the selective transformation of propane and CO_(2)to propylene and *** a result,the optimal 0.25%Rh0.50%Pt@Zn-MFI catalyst shows the best propylene yield,satisfactory CO_(2)conversion,and long-term ***,considering the tunable synergetic effects between the isolated cations and NPs,the developed approach offers a general guideline to design more efficient CO_(2)-ODP catalysts,which is validated by the improved performance of the bifunctional catalysts via simply substituting Sn4+cations for Zn2+cations in the MFI zeolite matrix.

关键词： Oxidative dehydrogenation Propane Carbon dioxide Finned Zn-MFI zeolite Encapsulated noble metal nanoparticles

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转炉锅炉管内部漏水外部处理技术研究与实施

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冶金设备管理与维修 2024年第1期42卷 63-65页

作者：王振奎任佩剑于铁辉曾国华刘铁鞍钢股份有限公司炼钢总厂辽宁鞍山114002

本文阐述了转炉锅炉水管内部漏水外部处理的方案及实施过程。方案切实可行,已应用到实际检修作业中,缩短了检修时间,效果良好,延长了锅炉备件使用寿命,提高了转炉蒸汽回收量。

关键词：转炉锅炉锅炉管漏水

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NK细胞在异基因造血干细胞微移植治疗急性髓系白血病中的作用研究

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中国实验血液学杂志 2024年第2期32卷 546-555页

作者：刘汝玉余长林乔建辉蔡博孙琪云王一刘铁强姜珊张天耀艾辉胜郭梅胡锴勋解放军总医院第五医学中心血液医学部北京100000 安徽医科大学安徽合肥230000

目的:探讨异基因造血干细胞微移植(MST)治疗急性髓系白血病(AML)患者中NK细胞的作用。方法:回顾性分析本中心2013-2018年接受MST治疗的93例AML患者的数据。诱导方案为蒽环类药物与阿糖胞苷联合粒细胞集落刺激因子动员后的外周血造血干细... 详细信息

目的:探讨异基因造血干细胞微移植(MST)治疗急性髓系白血病(AML)患者中NK细胞的作用。方法:回顾性分析本中心2013-2018年接受MST治疗的93例AML患者的数据。诱导方案为蒽环类药物与阿糖胞苷联合粒细胞集落刺激因子动员后的外周血造血干细胞(GPBSC)输注,获得完全缓解(CR)后给予2-4个疗程的中大剂量阿糖胞苷联合GPBSC强化治疗。分析移植前未达CR的42例患者经1个疗程、2个疗程MST诱导治疗后的效果。多因素COX回归模型分析供者NK细胞数量与KIR基因型包括KIR配体错配、2DS1、单倍型和HLA-Cw配体对患者生存的影响。结果:42例患者接受MST诱导治疗1个疗程后CR率为57.1%,2个疗程后CR率为73.7%。多因素分析结果显示,中、高剂量NK细胞与患者较长的无病生存(DFS)时间显著相关(HR=0.27,P=0.005;HR=0.21,P=0.001),高剂量NK细胞与患者的较长的总生存(OS)时间显著相关(HR=0.15,P=0.000)。供者2DS1阳性显著提高患者的OS(HR=0.25,P=0.011)。对于60岁以下高危患者,供受者KIR配体错配组患者的DFS长于非错配组(P=0.036);供者2DS1阳性显著延长患者的OS(P=0.009)。结论:NK细胞剂量、KIR配体错配与2DS1能够影响MST的治疗效果,改善AML患者的生存。

关键词：急性髓系白血病造血干细胞微移植 NK细胞 KIR

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Pushing the frontiers: Chip-based detection based on micro-and nano-structures

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Chinese Chemical Letters 2024年第4期35卷 86-98页

作者： Meihui liu Xinyuan Zhou Xiao Li Zhenjie Xue tie Wang Tianjin Key Laboratory of Life and Health Detection Life and Health Intelligent Research InstituteTianjin University of TechnologyTianjin 300384China

Changes in trace substances in human metabolites, which are related to disease processes and health status, can serve as chemical markers for disease diagnosis and symptom monitoring. Real-time online detection is an inevitable trend for the future of health monitoring, and the construction of chips for detection faces major challenges. The response of sensors often fails to meet the requirements for chipbased detection of trace substances due to the low efficiency of interfacial heterogeneous reactions, necessitating a rational design approach for micro-and nano-structures to improve sensor performance with respect to sensitivity and detection limits. This review focuses on the influence of micro-and nanostructures that used in chip on sensing. Firstly, this review categorizes sensors into chemiresistors, electrochemical sensors, fluorescence sensors, and surface enhanced Raman scattering(SERS) sensors based on their sensing principle, which have significant applications in disease diagnosis. Subsequently, commencing from the application requirements in the field of sensing, this review focuses on the different structures of nanoparticle(NP) assemblies, including wire, layered, core-shell, hollow, concave and deformable structures. These structures change in the size, shape, and morphology of conventional structures to achieve characteristics such as ordered alignment, high specific surface area, space limitation,vertical diffusion, and swaying behavior with fluid, thereby addressing issues such as poor signal transmission efficiency, inadequate adsorption and capture capacity, and slow mass transfer speed during sensing. Finally, the design direction of micro-and nano-structures, and possible obstacles and solutions to promote chip-based detection have been discussed. It is hope that this article will inspire the exploration of interface micro-and nano-structures modulated sensing methods.

关键词： Chip-based detection Micro-and nano-structures Real-time online detection Sensing Health monitoring

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建筑渣土对泡沫混凝土孔结构与传热的影响

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西南科技大学学报 2024年第2期39卷 32-39页

作者：杨晨熙金超蒋俊吴艳萍刘铁黄金桥西南科技大学环境友好能源材料国家重点实验室四川绵阳621010 西南科技大学材料与化学学院四川绵阳621010 宁波建工工程集团有限公司浙江宁波315040

为促进建筑渣土在建筑保温领域的资源化利用,以建筑渣土料浆为成孔介质,取代预制泡沫,辅以物理发泡工艺,制备了400 kg/m^(3)和600 kg/m^(3)密度等级泡沫混凝土,研究了渣土对其孔结构及传热行为的影响。结果表明:密度400 kg/m^(3)泡沫混... 详细信息

为促进建筑渣土在建筑保温领域的资源化利用,以建筑渣土料浆为成孔介质,取代预制泡沫,辅以物理发泡工艺,制备了400 kg/m^(3)和600 kg/m^(3)密度等级泡沫混凝土,研究了渣土对其孔结构及传热行为的影响。结果表明:密度400 kg/m^(3)泡沫混凝土的渣土料浆体积取代率从0%增至60%,导热系数从0.09 W/(m·K)降至0.07 W/(m·K);密度600 kg/m^(3)泡沫混凝土的渣土料浆体积取代率从0%增至100%,导热系数从0.14 W/(m·K)降至0.10 W/(m·K);渣土料浆的掺入细化了泡沫混凝土孔结构,增加了微观孔隙率。由于孔结构细化带来传热路径延长、气相导热系数与多孔基体导热系数下降,泡沫混凝土保温隔热性能提升。

关键词：建筑渣土泡沫混凝土孔结构保温隔热性能

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Monitoring recent changes in snow cover in Central Asia using improved MODIS snow-cover products

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Journal of Arid Land 2017年第5期9卷 763-777页

作者： liu Jinping ZHANG Wanchang liu tie Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing 100094 China University of Chinese Academy of Sciences Beijing 100039 China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China

Snow cover plays an important role in the fields of climatology and cryospheric science. Remotely-sensed data have been proven to be effective in monitoring snow covers. Improved methods to process the 8-day snow-cover products derived from MODIS Terra/Aqua data can dramatically increase the data quality and reduce noise. A five-step algorithm for removing cloud effects was designed to improve the quality of MODIS snow products, and the overall accuracy of the MODIS snow data without cloud（defined as cloud-free snow-cover dataset） was enhanced by more than 90% based on direct and indirect validation methods. The snow-cover frequency（SCF） and snow-cover rate（SCR） of Central Asia were analyzed from 2000 to 2015 using trend analysis and empirical orthogonal functions（EOFs）. Over the plain regions, the SCF displayed a significant north-south declining trend with a rate of 0.03 per degree of latitude, and the SCR showed a similar north-south gradient. In the mountainous areas, the SCF significantly increased with altitude by 0.12 per kilometer. Within the study area, the SCF in 65% of the study area experienced an increasing trend, but only 4.3% of the SCF-increasing pixels passed a significance test. The remaining 35% of the area underwent a decreasing trend of SCF, but only 5.2% of the SCF-decreasing pixels passed a significance test. For the entire Central Asia, the inter-annual variations of snow-cover presented a slight and insignificant increase trend from 2000 to 2015. However, the change trends of snow cover are different between the plain and mountainous regions. That is, the annual mean SCR in the plain areas displayed an increasing trend, but a decreasing trend was found in the mountainous areas.

关键词： snow-cover MODIS cloud-removing empirical orthogonal function Central Asia

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Research progress of CO_(2)oxidative dehydrogenation of propane to propylene over Cr-free metal catalysts

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Rare Metals 2022年第7期41卷 2129-2152页

作者： Zhong-Yu Wang Zhen-Hong He Long-Yao Li Shao-Yan Yang Meng-Xin He Yong-Chang Sun Kuan Wang Jian-Gang Chen Zhao-tie liu Shaanxi Key Laboratory of Chemical Additives for Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and TechnologyXi’an 710021China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi’an 710119China

CO_(2)-assisted oxidative dehydrogenation of propane(CO_(2)-ODHP)is an attractive strategy to offset the demand gap of propylene due to its potentiality of reducing CO_(2)emissions,especially under the demands of peaking CO_(2)emissions and carbon *** introduction of CO_(2)as a soft oxidant into the reaction not only averts the over-oxidation of products,but also maintains the high oxidation state of the redox-active ***,the presence of CO_(2)increases the conversion of propane by coupling the dehydrogenation of propane(DHP)with the reverse water gas reaction(RWGS)and inhibits the coking formation to prolong the lifetime of catalysts via the reverse Boudouard *** effective catalyst should selectively activate the C–H bond but suppress the C–C ***,to prepare such a catalyst remains ***-based catalysts are always applied in industrial application of DHP;however,their toxic properties are harmful to the *** this aspect,exploring environment-friendly and sustainable catalytic systems with Cr-free is an important *** this review,we outline the development of the CO_(2)-ODHP especially in the last ten years,including the structural information,catalytic performances,and mechanisms of chromium-free metal-based catalyst systems,and the role of CO_(2)in the *** also present perspectives for future progress in the CO_(2)-ODHP.

关键词： Propane Dehydrogenation Propylene CO_(2) Chromium-free metals Catalytic performance

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基于Hybrid-LCA模型的装配式夹芯保温墙板碳评价

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建筑节能（中英文） 2024年第1期52卷 23-26页

作者：王怡萍刘铁吴艳萍金超管小军杨莉琼(指导) 西南科技大学土木工程与建筑学院四川绵阳621010 宁波建工股份有限公司浙江宁波315000

为了量化不同构造的夹芯保温墙板的减排效果,选取6种典型保温构造,基于Hybrid-LCA法建立外墙全生命周期的碳评价模型。量化分析表明:夹芯保温体系的减排效果明显优于外保温体系。以建筑垃圾为保温芯材的夹芯保温墙板减排效果明显优于其... 详细信息

为了量化不同构造的夹芯保温墙板的减排效果,选取6种典型保温构造,基于Hybrid-LCA法建立外墙全生命周期的碳评价模型。量化分析表明:夹芯保温体系的减排效果明显优于外保温体系。以建筑垃圾为保温芯材的夹芯保温墙板减排效果明显优于其他保温墙体。复合夹芯保温墙板减排效果较好,但保温性能下降。普通混凝土夹芯保温墙板物化阶段减排效果优于预制清水混凝土和轻骨料混凝土夹芯保温墙板,同时墙体厚度小的优势增加了住房使用面积,但增加了运营阶段碳排放;预制清水混凝土与轻骨料混凝土夹芯保温墙板物化阶段减排效果差异不大,但由于其保温性能的提升,可降低建筑物运营能耗。

关键词：保温墙板碳排放混合生命周期

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Liquid state dependent solidification of a Co-B eutectic alloy under a high magnetic field

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Journal of Materials Science & Technology 2022年第21期116卷 58-71页

作者： Yixuan He Fan Bu Yuhao Wu Jianbao Zhang Dawei Luo Zhangchi Bian Qing Zhou tie liu Qiang Wang Jun Wang Haifeng Wang Jinshan Li Eric Beaugnon State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of NPU Shanghai 201108China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Univ.Grenoble Alpes INSA ToulouseUniv.Toulouse Paul SabatierEMFLCNRSLNCMI38000 GrenobleFrance

The structure transition inside the Co-81.5at.%B alloy liquid has been studied by an in-situ magnetization measurement.A crossover was observed on the 1/M-T curve during the overheating process,indicating that a liquid-liquid structure transition(LLST)took place in the *** on this information,the effects of LLST on the solidification behavior,microstructure and tribology property were investigated *** sample solidified with the LLST exhibits significantly different solidification behaviors,i.e.,the nucleation undercooling and the recalescence extent are conspicuously enlarged,and the solidification time is *** a result,the microstructure is effectively refined and homogenized,and the hardness and wear resistance are significantly *** present work might be helpful for not only theoretically understanding the influence of LLST on the solidification behavior but also providing an alternative approach to tailor the microstructure and properties.

关键词： Liquid-liquid structure transition Solidification Magnetization Tribology property

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Stable,intense supercontinuum light generation at 1 kHz by electric field assisted femtosecond laser filamentation in air

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Light(Science & Applications) 2024年第2期13卷 354-365页

作者： Yaoxiang liu Fukang Yin tie-Jun Wang Yuxin Leng Ruxin Li Zhizhan Xu See Leang Chin State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Centre d’Optique Photonique et Laser(COPL)and Département de physiquede génie physique et d’optiqueUniversitéLavalQuébecQuébecCanada

Supercontinuum(SC)light source has advanced ultrafast laser spectroscopy in condensed matter science,biology,physics,and *** to the frequently used photonic crystal fibers and bulk materials,femtosecond laser filamentation in gases is damage-immune for supercontinuum generation.A bottleneck problem is the strong jitters from filament induced self-heating at kHz repetition rate *** demonstrated stable kHz supercontinuum generation directly in air with multiple mJ level pulse *** was achieved by applying an external DC electric field to the air plasma *** pointing jitters of the 1 kHz air filament induced SC light were reduced by more than 2 *** stabilized high repetition rate laser filament offers the opportunity for stable intense SC generation and its applications in air.

关键词： intense repetition light

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