检索结果-内蒙古大学图书馆

Thixotropic composite hydrogels based on agarose and inorganic hybrid gellants

Chinese Journal of chemical engineering 2023年第2期54卷 240-247页

作者： Hongzhi Zhang Huiyan Guo Yang Liu Chengxiang Shi Lun Pan Xiangwen Zhang Ji-Jun Zou Key Laboratory for Advanced Fuel and Chemical Propellant of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Water can be used as oxidant in conjunction with metal particles to form metal-water propellant to increase the energy of *** this application,water needs to be stored in form of solid and capable of becoming liquid when *** and thixotropic hydrogel has good potential as water-retaining material and oxidant of metal-based *** this study,we prepared organic/inorganic composite hydrogels by combining inorganic gellants hectorite and fumed silica with organic gellant agarose,*** total content of the gellants can be reduced to less than 2%by adding *** influence of agarose on water content,phase transition temperature,centrifugal stability and other basic physical properties of composite hydrogels were *** results show that the composite hydrogels have better thixotropy and stability than pure inorganic hydrogels,and the gel-sol transformation can be realized by applying shear force or heating to the phase transition *** composite hydrogels have good shear thinning ability and improved mechanical *** silica/agarose hydrogels have better physical stability,while the thixotropy and shear thinning ability of hectorite/agarose hydrogels are better.

关键词： Composite hydrogels Organic gellant Inorganic gellant Rheological properties

来源：评论

学校读者我要写书评

暂无评论

Hydrogenation kinetic of alkenes and aromatics over NiMo hydrotreatment catalysts

引用

Chinese Journal of chemical engineering 2025年第3期79卷 11-22页

作者： Wenbo Li Xinyao Fu Weiming Zhai Xingyang Huang Wenbin Chen Chen Zhang Wei Zhang Cuiqing Li Yong Luo Feng Liu Mingfeng Li Beijing Key Laboratory of Enze Biomass Fine Chemicals School of New Materials and Chemical EngineeringBeijing Institute of Petrochemical TechnologyBeijing 102617China SINOPEC Research Institute of Petroleum Processing Co. LTDBeijing 100083China State Key Laboratory of Organic-Inorganic Composites Research Center of the Ministry of Education for High Gravity Engineering and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

Hydrotreatment is a critical process in the petrochemical industry to produce gasoline or *** kinetic models and accurate kinetic parameters of hydrotreatment reactions are important for the industrial reactor design and scale-up *** this work,hydrogenation kinetics of alkene and aromatic model compounds were studied thoroughly to provide deep understanding on alkene and aromatic hydrogenation behaviors in gasoline and diesel *** NiMo hydrotreatment catalysts were used to obtain experimental data of hydrogenation ***,1-octene,naphthalene and phenanthrene were used as model compounds of alkenes and ***-Hinshelwood-Hougen-Watson(LHHW)kinetic models for hydrotreatment reactions were *** addition,phase equilibrium calculations were combined with kinetic study,and it is discovered that using calculated liquid phase compositions as kinetic model input could greatly enhance the accuracy of kinetic models and the quality of kinetic parameters,leading to higher accordance with experimental *** kinetic models and phase equilibrium analysis,the effect of reaction conditions(temperature,pressure,and H_(2)/oil ratio)on reaction rates were also predicted and *** importance of phase equilibrium in kinetic analysis for hydrotreating reactions was demonstrated in this study,which provides an effective approach for future hydrotreatment reactor design and catalyst optimization.

关键词： Kinetic Hydrogenation Phase equilibria H_(2)/oil ratio

来源：评论

学校读者我要写书评

暂无评论

Recent progress in lanthanide ions doped inorganic metal halide perovskites

引用

Journal of Rare Earths 2024年第2期42卷 237-250,I0001页

作者： Yiyan Zhang Tianyu Zhao Guanying Chen MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringState Key Laboratory of Urban Water Resource and EnvironmentKey Laboratory of Micro-systems and Micro-structuresMinistry of EducationHarbin Institute of TechnologyHarbin150001China

Benefiting from their large molar extinction coefficient,high carrier mobility,narrow and tunable emissions,inorganic metal halide perovskites(IMHPs) demonstrate great potential in various optoelectrical devices including solar cells,light emitting diodes and photodetectors in the past few *** ions doping,well-known as a modification method of semiconductors,has been extensively applied in IMHPs as *** metal ions have been doped in IMHPs including alkali metals,alkali earth metals,transition metals and lanthanide metals,which either improve their optical performances or induce intriguing brand-new *** them,lanthanide metals feature plentiful energy levels and stable optical properties and are one of the most noteworthy *** we review recent progress in lanthanide ions doped *** summarize Yb,Eu or Er ions singly doping in detail,which was the most investigated species in *** lanthanide ions are also reviewed ***,we introduce lanthanide ions multi-doped IMHPs and at last we put forward several potential development *** the interests in lanthanide ions doped IMHPs rise,researchers have made some achievements in the *** though,there are more unexplored *** there are review articles focusing on metal ions doped IMHPs or lanthanide ions doped perovskites,this review aims to provide an overall introduction of lanthanide ions doped *** review may help researchers learn about lanthanide ions doped IMHPs and is to inspire researchers to make further promotion in this field.

关键词： Halide perovskite Lanthanide Doping Rare earths

来源：评论

学校读者我要写书评

暂无评论

Residence time distribution and heat/mass transfer performance of a millimeter scale butterfly-shaped reactor

引用

Chinese chemical Letters 2023年第4期34卷 332-337页

作者： Haicheng Lv Jundi Wang Zhongming Shu Gang Qian Xuezhi Duan Zhirong Yang Xinggui Zhou Jing Zhang State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

A millimeter scale butterfly-shaped reactor was proposed based on sizing-up strategy and fabricated via femtosecond laser engraving. An improvement of mixing performance and residence time distribution was realized by means of contraction and expansion of the reaction channel. The liquid holdup was greatly increased through connection of multiple mixing units. Structure optimization of the reactor was carried out by computational fluid dynamics simulation, from which the effect of reactor internals on mixing and the influence of parallel branching structure on heat transfer were discussed. The UV–vis absorption spectroscopy was used to determine the residence time distribution in the reactor, and characteristic parameters such as skewness and dimensionless variance were obtained. Further, a chained stagnant flow model was proposed to precisely describe the trailing phenomenon caused by fluid stagnation and laminar flow in small scale reactors, which enables a better fit for the experimental results of the asymmetric residence time distribution. In addition, the heat transfer performance of the reactor was investigated, and the overall heat transfer coefficient was 110–600 W m^(-2)K-1in the flow rate range of 10–40 m L/min.

关键词： Millimeter scale reactor Computational fluid dynamics Residence time distribution Chained stagnant flow model Overall heat transfer coefficient

来源：评论

学校读者我要写书评

暂无评论

Molecular modulating of cobalt phthalocyanines on aminofunctionalized carbon nanotubes for enhanced electrocatalytic CO_(2)conversion

引用

Nano Research 2023年第3期16卷 3649-3657页

作者： Huajian Xu Huizhu Cai Linxia Cui Limei Yu Rui Gao Chuan Shi State Key Laboratory of Fine Chemicals College of Chemical EngineeringDalian University of TechnologyDalian 116024China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Metal porphyrins and metal phthalocyanines(Pc)constitute a promising class of metal molecular catalysts(MMCs)for efficient CO_(2)-to-CO electrocatalytic conversion due to their well-defined molecular *** to adjust the local coordination and electronic environment of the metal center and enhance the molecular-level dispersion of the active components remains as great challenges for further improving the ***,a cobalt(II)Pc(CoPc)-COOH/carbon nanotube(CNT)-NH_(2)hybrid catalyst was rationally designed by clicking the CoPc-COOH molecules onto the surface of CNT-NH_(2)through amidation *** novel hybrid catalyst exhibited the enhanced current density of 22.4 mA/cm2 and CO selectivity of 91%at−0.88 V *** hydrogen electrode(RHE)in the CO_(2)electroreduction,as compared with CoPc-COOH/CNT and CoPc/CNT *** superior activity was ascribed to the charge transfer induced by introduction of-COOH and-NH_(2)functional groups to CoPc and CNT,respectively,facilitating the active centers of CoI being generated at lower potentials,and leading to the highest turnover frequency(TOF)being obtained over the CoPc-COOH/CNT-NH_(2)hybrid *** inherent directivity and saturability of covalent bonds formed via the amidation reaction ensure not only a higher density of Co active centers,but also an improved stability for CO_(2)reduction reaction(CO_(2)RR).The present study represents an effective strategy for improving MMCs performance by molecular modulating of metal phthalocyanines on functionalized carbon substrates directed by click confinement chemistry.

关键词： electrocatalytic CO_(2)reduction cobalt tetracarboxylphthalocyanine amino functionalized carbon nanotubes amidation

来源：评论

学校读者我要写书评

暂无评论

NiCo_(2)O_(4)@quinone-rich N-C core-shell nanowires as composite electrode for electric double layer capacitor

引用

Frontiers of chemical Science and engineering 2023年第4期17卷 373-386页

作者： Yanli Fang Hui Wang Xuyun Wang Jianwei Ren Rongfang Wang State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Department of Mechanical Engineering Science University of JohannesburgJohannesburg 2006South Africa

The bind-free carbon cloth-supported electrodes hold the promises for high-performance electrochemical capacitors with high specific capacitance and good cyclic *** the close connection between their performance and the amount of carbon material loaded on the electrodes,in this work,NiCo_(2)O_(4) nanowires were firstly grown on the substrate of active carbon cloth to provide the necessary surface area in the longitudinal ***,the quinone-rich nitrogen-doped carbon shell structure was formed around NiCo_(2)O_(4) nanowires,and the obtained composite was used as electrode for electric double layer *** results showed that the composite electrode displayed an area-specific capacitance of 1794 mF·cm^(-2) at the current density of 1 mA·cm^(-2).The assembled symmetric electric double layer capacitor achieved a high energy density of 6.55 mW·h·cm^(-3) at a power density of 180 mW·cm^(-3).The assembled symmetric capacitor exhibited a capacitance retention of 88.96%after 10000 charge/discharge cycles at the current density of 20 mA·cm^(-2).These results indicated the potentials in the preparation of the carbon electrode materials with high energy density and good cycling stability.

关键词： carbon cloth NiCo_(2)O_(4)nanowires core−shell structure quinone-rich electric double layer capacitor

来源：评论

学校读者我要写书评

暂无评论

Bridgman growth and characterization of langanite(La_3Ga_(5.5)Nb_(0.5)O_(14),LGN)single crystal

引用

Journal of Rare Earths 2025年第3期43卷 584-590,I0006页

作者： Chengkai Ren Libin Yin Shuai Wang Weirong Chen Sheng Wang Kainan Xiong Xiaoniu Tu Ningzhong Bao Yanqing Zheng Jun Chen Erwei Shi Institute of Ceramics Chinese Academy of SciencesShanghai201800 China State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China The State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China College of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing100083China Hainan University Haikou570228China

As a promising optical and piezoelectric crystal,efficient growth of LGN single crystal is crucial for its practical ***,a langanite(La_(3)Ga_(5.5)Nb_(0.5)O_(14),LGN)crystal with high quality was successfully grown by the Bridgman method along the Z *** order to prepare high-purity polycrystalline precursors for LGN crystal growth,the sintering conditions of LGN polycrystalline precursors were studied in *** melting point of LGN was also measured to provide a reference for the crystal growth *** the[001]oriented wafer,the full width at half maximum(EWHM)value of the nigh-resolution X-ray diffraction(HRXRD)analysis is 38.52",demonstrating that the LGN crystal exhibits excellent crystalline *** addition,we also measured the thermal properties and transmission spectrum of the as-grown LGN *** is found that the absorption peak at 1.85μm of the LGN crystal grown in air using the Bridgman method disappears compared with previous reports(grown in N_(2+)(1-3)vol%O_(2)atmosphere),which is attributed to the oxygen-enriched growth *** phenomenon also occurs in other LGS-type disordered *** is believed that these findings may expand the potential applications of LGS series crystals at 1.85μm.

关键词： Langanite Rare earths Bridgman method Oxygen-enriched growth Optical materials

来源：评论

学校读者我要写书评

暂无评论

MOF-derived Se doped MnS/Ti_(3)C_(2)T_(x) as cathode and Zn-Ti_(3)C_(2)T_(x) membrane as anode for rocking-chair zinc-ion battery

引用

Nano Research 2024年第4期17卷 2781-2789页

作者： Kaisheng Sun Zemao Xiao Yunfei Shen Heng Lv Jianpeng Zhu Jianxiang Pang Yang Zheng Wenwen Kong Long Chen School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832003China CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Key Laboratory of Electronic Information Materials and DevicesCenter of Materials Science and Optoelectronics EngineeringXinjiang Technical Institute of Physics and Chemistry of CASUrumqi 830011China

Mn-based zinc ion battery has the advantages of low cost and high performance,which makes it the promising energy storage ***,the poor conductivity and the agglomeration in the synthesis process of manganese-based materials restrict the performance of ***,the Se-doped MnS/Ti_(3)C_(2)T_(x)(Se-MnS/Ti_(3)C_(2)T_(x))composite material derived from Mn-based metal-organic framework is *** tests show that Se-doped could generate S defects and enhance the electrochemical activity of *** the same time,the introduction of Ti_(3)C_(2)T_(x) substrate is conducive to exposing more sulfur defects and improving the utilization rate of *** the mechanism study,it is found that Se-MnS/Ti_(3)C_(2)T_(x) is transformed into S/Se co-doped Mn3O_(4) at the first charge,which innovatively elucidated the behavior of S/Se during *** the electrochemical performance test,the specific capacity can reach 74.7 mAh·g^(-1) at 5.0 A·g^(-1).In addition,the Zn-Ti_(3)C_(2)T_(x) membrane electrode is prepared by vacuum filtration as the zinc-poor anode,which is assembled into the rocking chair full battery to avoid dendrite growth and exhibit excellent rate *** addition of Zn2+weakens the electrostatic repulsion between the interlayers of MXene,and the formation of the folded morphology aids the penetration of the *** 1.0 A·g^(-1),the capacity can reach 50.6 mAh·g^(-1).This work is helpful to promote the research and development of the reaction mechanism of manganese based rocking chair batteries.

关键词： rocking-chair zinc-ion battery MnS Zn-Ti_(3)C_(2)T_(x) membrane Se doped Ti_(3)C_(2)T_(x) composite

来源：评论

学校读者我要写书评

暂无评论

Enhanced C_(3)H_(6)/C_(3)H_(8)separation performance in polysulfone membrane blended with rigid ZIF-8 crystals

引用

Frontiers of chemical Science and engineering 2025年第1期19卷 89-99页

作者： Jiayu Luo Luxi Lyu Zongjie Yin Yanying Wei State Key Laboratory of Pulp and Paper Engineering School of Chemistry&Chemical EngineeringGuangdong Provincial Key Lab of Green Chemical Product TechnologySouth China University of TechnologyGuangzhou 510640China Guangzhou Academy of Special Equipment Inspection&Testing Guangzhou 510000China Quzhou Membrane Material Innovation Institute Quzhou 324000China

Metal-organic frameworks have a wide range of applications in the field of membrane separation,but the inherent flexible structure and the difficulty for scale-up hinder their further ***,the relatively rigid zeolitic imidazolate framework-8 particles prepared under an electric field(E-ZIF-8)were used as the fillers in polysulfone(PSF)to form series of mixed matrix *** was found that the introduction of E-ZIF-8 improves both the C3H6 permeability and C_(3)H_(6)/C_(3)H_(8) selectivity of the *** with the bare PSF membrane,the C_(3)H_(6)/C_(3)H_(8) selectivity of the 30 wt%E-ZIF-8@PSF membrane increased by~230%,while the C3H6 permeability was enhanced by~830%.In addition,time and pressure dependence analysis demonstrated that such E-ZIF-8@PSF membranes also exhibited good long-term stability and pressure resistance,offering significant industrialization advantages.

关键词： gas separation metal-organic frameworks mixed matrix membranes

来源：评论

学校读者我要写书评

暂无评论

H_(2)O_(2) treatment boosts activity of NiFe layered double hydroxide for electro-catalytic oxidation of urea

引用

Journal of Environmental Sciences 2023年第7期129卷 152-160页

作者： Jinshan Wei Jin Wang Xiaoming Sun College of Materials Science and Engineering Key Laboratory of Optoelectronic Devices and SystemsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

Urea oxidation reaction(UOR)provides a method for hydrogen production besides wastewater treatment,but the current limited catalytic activity has prevented the ***,we develop a novel H_(2)O_(2) treatment strategy for tailoring the surface oxygen ligand of NiFe-layered double hydroxides(NiFe-LDH).The sample after H_(2)O_(2) treatment(NiFeOLDH)shows significant enhancement on UOR efficiency,with the potential of 1.37 V(RHE)to reach a current density of 10 mA/cm^(2).The boost is attributed to the richness adsorption O ligand on NiFeO-LDH as revealed by XPS and Raman *** calculation indicates formation of two possible types of oxygen ligands:adsorbed oxygen on the surface and exposed from hydroxyl group,lowered the desorption energy of CO_(2) product,which lead to the lowered onset *** strategy is further extended to NiFe-LDH nano sheet on Ni foam to reach a higher current density of 440 mA/cm^(2) of UOR at 1.8 V(RHE).The facile surface O ligand manipulation is also expected to give chance to many other electro-catalytic oxidations.

关键词： NiFe-LDH Urea oxidation reaction H_(2)O_(2)treatment Electro-catalysis Hydrogen production

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：