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Chinese Journal of Chemical Engineering 2023年第12期64卷 128-138页

作者： Wangtao Li qiancheng zheng Huayu Zhang Yunsheng Dai zhengbao Wang Key Laboratory of Biomass Chemical Engineering of Ministry of Education ERC of Membrane and Water Treatment(MOE)Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Yunnan Precious Metals Laboratory Co. LtdKunming 650106China

Gold catalysts supported on Mg-Al mixed oxides for oxidative esterification of methacrolein are prepared by *** of the support particle size,concentration of HAuCl4 solution and Mg/Al ratio on gold loading and catalytic properties are *** catalysts are characterized by CO_(2)-TPD,EDS,XPS,STEM and XRD *** with smaller support particle size show more uniform gold distribution and higher gold dispersion,resulting in a higher catalytic performance,and the uniformity of gold and the activity of the catalysts with larger support particle size can be improved by decreasing the concentration of HAuCl4 *** Mg/Al molar ratio has significant effect on the uniformity of gold and the activity of the catalyst,and the optimum Mg/Al molar ratio is 0.1–*** study underlines the importance of engineering support particle size,concentration of HAuCl4 solution and density of adsorption sites for efficient gold loading on support by impregnation.

关键词： Gold catalysts Oxidative esterification Support particle size effect Mass transfer Distributions Optimization

Fabrication of ZIF-8 membranes on dual-layer ZnO-PES/PES organic hollow fibers by in-situ crystallization

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Chinese Journal of Chemical Engineering 2023年第3期55卷 101-110页

作者： zhengchi Yin Xiaoke Wu Yanwei Yang Huayu Zhang Wangtao Li Ruimin Zhu qiancheng zheng zhengbao Wang Key Laboratory of Biomass Chemical Engineering of Ministry of Education ERC of Membrane and Water Treatment(MOE)Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China

Compared to inorganic supports, polymeric supports can offer additional benefits, e.g., easier processing and cheaper. However, the organic surface has weak adhesion to the zeolitic imidazolate frameworks(ZIFs) membrane layer, which usually requires complex surface modification or seeding. Herein, we demonstrate that a dual-layer asymmetric polymer support prepared by a simple spinning process is a good candidate for the preparation of ZIF-8 membrane. The inner layer of the support is an organic hollow fiber(PES) with finger-like pores, and the outer layer is a ZnO-PES composite layer with finger-like pores also. The ZnO-PES composite layer is expected to contain uniform ZnO crystals in the polymer matrix, i.e., the ZnO particles in the skin layer of the support are not easy to fall off. Under the induction of ZnO particles in the outer layers, continuous ZIF-8 membranes can be prepared by single in-situ crystallization, showing good adhesion to the supports. The obtained ZIF-8 membranes show a H_(2) permeance of 8.7 × 10^(-8)mol·m^(-2)·s^(-1)·Pa^(-1) with a H_(2)/N_(2) ideal separation selectivity of 18.0. The design and preparation of this dual-layer polymer support is expected to promote the large-scale application of MOF membranes on polymer supports.

关键词： Dual-layer PES hollow fiber In-situ crystallization ZIF-8 membrane Gas separation ZnO

Framework Zr Stabilized PtSn/Zr-MCM-41 as a Promising Catalyst for Non-oxidative Ethane Dehydrogenation

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Chinese Journal of Chemistry 2022年第8期40卷 918-924页

作者： Jisheng Xu Chengxiang Shi Shuguang Zhang qiancheng zheng Lun Pan Xiangwen Zhang Ji-Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Zhejiang Institute of Tianjin University NingboZhejiang315201China

Non-oxidative ethane dehydrogenation is a promising route to produce ***,PtSn supported catalysts were investigated to achieve better ethane dehydrogenation performance by introduction of different Zr promoters,i.e.,framework Zr and ZrO_(2),to mesoporous ***-situ XRD,TEM and CO chemisorption show that aggregation of metal particles and phase segregation of Pt_(3)Sn to Pt and PtSn_(3) at high temperature occur for PtSn/M,leading to bad ethane dehydrogenation *** interaction be-tween ZrO_(2) and PtSn species,as proved by XPS,results in restrained metal particles,which promotes the initial ***,Pt phase generated on surface is disadvantageous for the desorption of produced ethene as indicated by CO-IR and C_(3)H_(6)-TPD,and pyridine-IR and NH_(3)-TPD indicate strong acidity *** deactivate the catalyst rapidly by deep dehydrogenation and *** interaction between PtSn species and Si-O-Zr with much weaker acidity is formed when framework Zr is incorporated into MCM-41,which benefits the dispersion of metal particles,formation of Pt_(3)Sn/Pt species and stabilization of metal species from phase *** initial ethane conversion and ethene selectivity of ca.99%were achieved for the optimal PtSn/ZrM,which is more coking-tolerant and stable by generating graphitic carbon mainly on support instead of active metals.

关键词： Alkanes Dehydrogenation Platinum Framework heteroatoms Metal-support interaction

Binding sensitivity of adefovir with different genotypes of HBV polymerase:molecular modeling,docking and dynamics simulation studies

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Binding sensitivity of adefovir with different genotypes of ...

中国化学会第28届学术年会

作者： Jing Li,Yun Du,Xian Liu,qiancheng Shen,Mingyue zheng*,Xiaomin Luo,Hualiang Jiang Shanghai Institute of Materia Medica,Chinese Academy of Sciences,201203,Shanghai

＜正＞Adefovir is a nucleos（t）ide analogue reverse transcriptase inhibitor （NRTIs）, which has been evaluated as primary monotherapy for patients with chronic hepatitis B.

关键词： HBV polymerase genotype adefovir molecular dynamics simulation free energy calculation

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对水工构筑物设计的几点看法

工业安全与环保 2005年第5期31卷 41-42页

作者：郑前程刘坤雷武汉凯迪水务有限公司武汉430223

探讨了水工构筑物设计中的地下水位确定、伸缩缝设置、总体布置及设计与施工配合等问题。设计在满足国家有关政策、规范要求的同时,要做到技术先进、安全适用、经济合理。

关键词：水工构筑物设计伸缩缝设置地下水位施工配合总体布置规范要求经济合理

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污水处理工程中的裂缝控制

工业安全与环保 2005年第7期31卷 40-41页

作者：刘坤雷郑前程武汉凯迪水务有限公司武汉430223

讨论了在污水处理工程中,钢筋混凝土结构裂缝产生的原因,提出了具体的裂缝控制措施。

关键词：污水处理工程混凝土结构裂缝裂缝控制措施钢筋

A New Family of SO_(4)^(2–)-Templated 3d-4f High-Nuclearity Clusters:Syntheses,Structures,and Magnetic Properties

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Chinese Journal of Chemistry 2024年第20期42卷 2438-2444页

作者： Caihong Fan Kaipeng Bai qiancheng Luo Tian Han Chang Huang Yanzhen zheng Weipeng Chen Frontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Key Laboratory of ElectronicDevicesandMaterials ChemistrySchoolof ChemistryInstrumentAnalysis CenterXi'an JiaotongUniversityXi'an Shaanxi 710049China

The precise syntheses of transition-rare-earth metal clusters with desired structures remain a great ***,by utilizing SO_(4)^(2-)anion released by in-situ decomposition of sodium dodecyl sulfate(SDS)as a template,a series of novel high-nuclearity 3d-4f clusters,formulated as[Ni_(24)Pr_(22)(μ_(3)-OH)_(31)(pida)_(24)(SO_(4))_(4)(NO_(3))_(9)(CH_(3)COO)_(3)]·Br_(4)·(NO_(3))_(11)·_(16)H_(2)O·25CH_(3)OH(1,H_(2)pida=N-phenyliminodiacetic acid),[Ni_(24)Nd_(22)(μ3-OH)_(31)(pida)_(24)(SO_(4))_(4)(NO_(3))_(9)(CH_(3)COO)_(3)]·Br_(4)·(NO_(3))_(11)·14H_(2)O·24CH_(3)OH(2)and[Ni_(24)Gd_(22)(μ3-OH)_(36)(bida)_(24)(SO_(4))_(7)(NO_(3))_(3)(CH_(3)COO)_(3)]·(SO_(4))·Br_(4)·(NO_(3))_(4)·31H_(2)O·32CH_(3)OH(3,H_(2)bida=N-benzyliminodiacetic acid),have been successfully isolated.X-ray crystal structure analyses reveal that all the cationic{Ni_(24)RE_(22)}cores in 1-3 possess a ball-like structure with C_(3v)symmetry,and can be viewed as consisting of an inner{RE_(22)}core and an outer{Ni_(24)}*** 1 and 2 to 3,due to the lanthanide contraction effect,the coordination numbers for rare-earth metal centers in{RE_(22)}are different,resulting in different number of SO_(4)^(2-)and NO_(3)^(-)anions to support and stabilize the skeleton ***,the magnetic properties of complexes 1-3 were also *** result revealed that complexes 1-3 show antiferromagnetic/ferrimagnetic interactions,and 3 exhibits magneto-caloric effect at ultralow temperatures with a maximum-ΔSm(magnetic entropy change)value of 33.03 J·kg^(−1)·K^(−1)at 3.0 K and 7 T.

关键词： Transition-Rare-earth metal Cluster Anionic template Magnetic exchange Magnetic refrigeration

Rigid Dysprosium(Ⅲ)Single-Molecule Magnets Exhibit Preserved Superparamagnetism in Solution

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Chinese Journal of Chemistry 2022年第5期40卷 563-570页

作者： Xiali Ding qiancheng Luo Yuanqi Zhai Xufeng Zhang Yi Lv Xinliang Zhang Chao Ke Chao Wu Yanzhen zheng Frontier Institute of Science and Technology(FIST) State Key Laboratory of Mechanical Behavior for MaterialsMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Key Laboratory of Sustainable Energy and Materials ChemistrySchool of Chemistry and School of PhysicsXi'an Jiaotong University99 Yanxiang RoadXi'anShaanxi710054 China Department of Hepatobiliary Surgery and The First Affiliated Hospital of Xi'an Jiaotong University 277 West Yanta RoadXi'anShaanxi710061 China Department of Spine Surgery Honghui HospitalXi'an Jiaotong University76 Nanguo RoadXi'anShaanxi710054 China Department of Orthopaedics and Trauma Hong Hui HospitalCollege of MedicineXi'an Jiaotong University555 East Youyi RoadXi'anShaanxi710054 China

Molecules with long preserved magnetic moments are perceived as the smallest units for storing bytes,which could bring a new revolution for information ***,the rational design of such molecules remains *** two rigid adamantanol ligand based dysprosium(III)complexes([Dy(1-AdO)_(2)(py)_(5)]BPh_(4)-1 and[Dy(2-AdO)_(2)(py)_(5)]BPh_(4)-2)with pentagonal-bipyramidal coordination geometry and local D5h symmetry were successfully prepared,which display excellent single-molecule magnet(SMM)behavior(U_(eff)≈1835 K,T_(B)_(ZFC)≈24 K,T_(B)^(100s)≈17 K and T_(B)^(H)=23 K for 1;U_(eff)≈1756 K,T_(B)^(ZFC)≈20 K,T_(B)^(100s)≈16 K and T_(B)^(H)=23 K for 2)due to the much weakened vibration in low energy ***,the large energy barriers and high blocking temperatures for these two complexes in solid states are well preserved in *** is never observed in previous studies of SMMs,indicating that the adamantanol is rigid and can be introduced to make the composed molecules stable enough to maintain the solid state magnetic property in solution.

关键词： Molecularmagnets Lanthanide D_(sh)-symmetry Superparamagnetism Solution

Simulation research on dynamic performance of the new type high-pressure solenoid valve

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Mechanical Engineering Science 2020年第2期2卷 43-48,I0005页

作者： Qihui YU qiancheng WANG Kaifei ZHANG Weiwei zheng School of Mechanical Engineering Inner Mongolia University of Science and TechnologybaotouChina The State Key Laboratory of Fluid Power and Mechatronic Systems HangzhouChina College of Mechanical and Electrical Engineering Henan Agricultural University450002ZhengzhouChina College of Mechanical and Electrical Engineering Henan radio and television UniversityZhengzhouChina

To improve energy density,the transportation,storage,and operations of hydrogen,methane,and compressed air vehicles currently require high-pressure ***-pressure solenoid valve becomes the vital element to above *** order to reduce leakage and aerodynamic force influence,a new type high-pressure solenoid valve was *** simulation model which included electromagnetic model,aerodynamic force model was established by means of the nonlinear mathematic *** the software MATLAB/Simulink for simulation,the dynamic response characteristics of high-pressure pneumatic solenoid valve were obtained under different pulse width modulation(PWM)input control *** show that,first of all,the new type of high-pressure solenoid valve can meet the switch ***,the opening movement and closing movement of the spool lags the PWM rising signal,and the coil current fluctuates significantly during the movement of the ***,on/off status of high-pressure valve cannot be represented by the duty *** research can be referred in the design of the high-pressure solenoid valve..

关键词： high-pressure solenoid valve dynamic response performance pulse width modulation the duty cycle

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稀土单分子磁体研究进展

中国稀土学报 2021年第3期39卷 391-424页

作者：李子涵罗前程郑彦臻西安交通大学前沿科学技术研究院陕西西安710054

单分子磁体是一类纳米尺度的磁性材料,在高密度信息存储、量子比特和自旋电子器件等方面具有潜在的应用价值而备受关注。由于稀土离子具有大的磁矩和强的磁各向异性,稀土离子在高性能单分子磁体构筑方面有过渡金属离子不可比拟的优势。... 详细信息

单分子磁体是一类纳米尺度的磁性材料,在高密度信息存储、量子比特和自旋电子器件等方面具有潜在的应用价值而备受关注。由于稀土离子具有大的磁矩和强的磁各向异性,稀土离子在高性能单分子磁体构筑方面有过渡金属离子不可比拟的优势。近年来,以单核和双核稀土单分子磁体为代表的稀土单分子磁体的研究取得了长足的进展,尤其是突破了以液氮沸点温度(77 K)为界限的磁阻塞温度,为室温下的单分子信息存储迈出了坚实的一步。

关键词：稀土单分子磁体磁各向异性磁弛豫自旋-晶格耦合