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Cu/Co/Cr Nanocomposites Obtained from Hydrotalcite Precursors as Catalysts for Thermal Decomposition of Ammonium Perchlorate

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 211-216页

作者： Hongbo Liu Zhiyong Huang Bingzhi Guo qingze jiao Zhiyong Xiong School of Chemical Engineering and Materials Science Beijing Institute of Technology Zhuhai School of Chemical Engineering and Environment Beijing Institute of Technology College of Light Industry and Food Sciences South China University of Technology

A series of Cu/Co/Cr nanocomposites with different Cu/Co/Cr molar ratios were obtained by calcination of Cu/ Co/Cr hydrotalcites precursors, which were prepared by a co-precipitation reaction. X-ray diffraction, inductively coupled plasma analysis, and transmission electron microscopy were used to characterize the structure, composition, and mor- phology of Cu/Co/Cr nanocomposites. The results show that Cu/Co/Cr nanocomposites have both CuCr204 and CoCr204 spinel phase. The particle size of Cu/Co/Cr nanocomposites is 15-20 nm and the specific surface area is 95-115 m2/g. Cu/ Co/Cr nanocomposites were used as new catalysts for improving thermal decomposition of ammonium perchlorate （AP）. Their catalytic activities were investigated using differential thermal analysis and thermal gravimetric analyzer coupled with an online mass spectrometer. The results show that the decomposition temperature of AP lowered 132-146℃ by adding 4 wt% Cu/Co/Cr nanocomposites. Catalytic activities of the prepared nanocomposites depend on the calcinations temperature and addition amount of corresponding nanocomposites. The possible catalytic mechanism of Cu/Co/Cr nanocomposites was also studied and discussed.

关键词： Nanocomposite Thermal decomposition Catalytic activities 1

Synthesis of Magnetic Nickel Ferrite Microspheres and Their Microwave Absorbing Properties

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Chemical Research in Chinese Universities 2016年第4期32卷 678-681页

作者： jiao qingze WANG Yanfeng HAO Liang LI Hansheng ZHAO Yun School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081 P. R. China School of Chemical Engineering and Materials Science Beijing Institute of Technology Zhuhai Zhuhai 519085 P. R. China

NiFe2O4 microspheres were synthesized using a solvothermal method. The morphologies and structures of NiFe2O4 micropheres were characterized via a field emission scanning electron microscope（FESEM）, a transmission electron microscope（TEM） and an X-ray diffractometer（XRD）. The NiFe2O4 microspheres were around 150--200 nm in diameter and assembled by nanoparticles. The magnetic and electromagnetic parameters were measured using a vibrating sample magnetometer and a vector network analyzer, respectively. The obtained products exhibited a saturation magnetization of 60.8 A.m2·kg-1 at room temperature. A minimum reflection loss（RL） of -27.8 dB was observed at 9.2 GHz with a thickness of 3.5 mm, and the effective absorption frequency（RL〈-10 dB） ranged from 8.2 GHz to 11.2 GHz, indicating the excellent microwave absorption performance of the NiFe2O4 microspheres in the X-band frequencies.

关键词： Nickel ferrite microsphere Magnetic property Microwave absorption property

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

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Nano-Micro Letters 2019年第4期11卷 337-352页

作者： Shanshan Wang Yingchun Xu Ruru Fu Huanhuan Zhu qingze jiao Tongying Feng Caihong Feng Daxin Shi Hansheng Li Yun Zhao School of Chemistry and Chemical Engineering Beijing Institute of TechnologyZhuhai 100081People’s Republic of China School of Materials and the Environment Beijing Institute of TechnologyZhuhai 519085People’s Republic of China

Developing lightweight and broadband microwave absorbers for dealing with serious electromagnetic radiation pollution is a great ***,a novel Fe-Co/N-doped carbon/reduced graphene oxide(Fe-Co/NC/rGO)composite with hierarchically porous structure was designed and synthetized by in situ growth of Fe-doped Cobased metal organic frameworks(Co-MOF)on the sheets of porous cocoon-like rGO followed by *** Fe-Co/NC composites are homogeneously distributed on the sheets of porous *** Fe-Co/NC/rGO composite with multiple components(Fe/Co/NC/rGO)causes magnetic loss,dielectric loss,resistance loss,interfacial polarization,and good impedance *** hierarchically porous structure of the Fe-Co/NC/rGO enhances the multiple reflections and scattering of *** with the Co/NC and Fe-Co/NC,the hierarchically porous Fe-Co/NC/rGO composite exhibits much better microwave absorption performances due to the rational composition and porous structural *** minimum reflection loss(RLmin)reaches?43.26 dB at 11.28 GHz with a thickness of 2.5 mm,and the effective absorption frequency(RL≤?10 dB)is up to 9.12 GHz(8.88-18 GHz)with the same thickness of 2.5 ***,the widest effective bandwidth of 9.29 GHz occurs at a thickness of 2.63 *** work provides a lightweight and broadband microwave absorbing material while offering a new idea to design excellent microwave absorbers with multicomponent and hierarchically porous structures.

关键词： Fe-doped Co-MOF Hierarchically porous rGO Broadband Microwave absorption performance

Catalytic performance of acidic ionic liquid-functionalized silica in biodiesel production

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Journal of Energy Chemistry 2014年第1期23卷 97-104页

作者： Bin Zhen qingze jiao Qin Wu Hansheng Li School of Chemical Engineering and the Environment Beijing Institute of Technology Department of Chemical Engineering Tsinghua University

Acidic ionic liquid([BsAIm][OTf]) was immobilized on sulfhydryl-group-modified SiO2(MPS-SiO2) via free radical addition reaction. The[BsAIm][OTf] loading on acidic ionic liquid-functionalized silica([BsAIm][OTf]/SiO2) was controlled through tuning the sulfydryl(SH)content of MPS-SiO2. All the samples were characterized by FT-IR, elemental analysis, N2adsorption-desorption measurements and TGDTA. The catalytic performance of [BsAIm][OTf]/SiO2in the esterification of oleic acid and the transesterification of glycerol trioleate for biodiesel production was investigated. The results showed that with the increase of [BsAIm][OTf] loading on SiO2the specific surface area and pore volume of [BsAIm][OTf]/SiO2decreased, and the pore diameter of [BsAIm][OTf]/SiO2narrowed. In the esterificaiton of oleic acid, the oleic acid conversion increased with the increasing [BsAIm][OTf] loading. In the transesterification of glycerol trioleate, with the increasing[BsAIm][OTf] loading the glycerol trioleate conversion decreased and the selectivities to glycerol monooleate and methyl oleate increased.

关键词： supported ionic liquid catalysts esterification transesterification biodiesel

Visualizing grain boundaries in monolayer MoSe2 using mild H2O vapor etching

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Nano Research 2018年第8期11卷 4082-4089页

作者： Jinhuan Wang Xiaozhi Xu Ruixi Qiao Jing Liang Can Liu Bohao Zheng Lei Liu Peng Gao qingze jiao Dapeng Yu Yun Zhao Kaihui Liu School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University 8eijing 100871 China Department of Materials Science and Engineering College of Engineering Peking University 8eijing 100871 China International Centre for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 10087 I China Department of Physics South University of Science and Technology of China Shenzhen 518055 China Collaborative Innovation Centre of Quantum Matter Beijing 100871 China Jinhuan Wang Xiaozhi Xu and Ruixi Qiao contributed equally to this work.

Beyond graphene, two-dimensional （2D） transition metal dichalcogenides （TMDs） have attracted significant attention owing to their potential in next-generation nanoelectronics and optoelectronics. Nevertheless, grain boundaries are ubiquitous in large-area as-grown TMD materials and would significantly affect their band structure, electrical transport, and optical properties. Therefore, the characterization of grain boundaries is essential for engineering the properties and optimizing the growth in TMD materials. Although the existence of boundaries can be measured using scanning tunneling microscopy, transmission electron microscopy, or nonlinear optical microscop~ a universal, convenient, and accurate method to detect boundaries with a twist angle over a large scale is still lacking. Herein, we report a high-throughput method using mild hot H20 etching to visualize grain boundaries of TMDs under an optical microscope, while ensuring that the method is nearly noninvasive to grain domains. This technique utilizes the reactivity difference between stable grain domains and defective grain boundaries and the mild etching capacity of hot water vapor. As grain boundaries of two domains with twist angles have defective lines, this method enables to visualize all types of grain boundaries unambiguously. Moreover, the characterization is based on an optical microscope and therefore naturally of a large scale. We further demonstrate the successful application of this method to other TMD materials such as MoS2 and WSe2. Our technique facilitates the large-area characterization of grain boundaries and will accelerate the controllable growth of large single-crystal TMDs.

关键词： MoSez,grain boundar3 hot water vapor single crystal

Lipid-conjugated siRNA hitchhikes endogenous albumin for tumor immunotherapy

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Chinese Chemical Letters 2023年第11期34卷 202-208页

作者： Bo Hu Sudong Kong Yuhua Weng Deyao Zhao Abid Hussain qingze jiao Shijing Zhan Ling Qiu Jianguo Lin Minhao Xie Bo Li Yuanyu Huang School of Life Science Advanced Research Institute of Multidisciplinary ScienceSchool of Medical TechnologyKey Laboratory of Molecular Medicine and BiotherapyKey Laboratory of Medical Molecule Science and Pharmaceutics EngineeringBeijing Key Laboratory for Separation and Analysis in Biomedicine and PharmaceuticalsBeijing Institute of TechnologyBeijing 100081China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China NHC Key Laboratory of Nuclear Medicine Jiangsu Key Laboratory of Molecular Nuclear MedicineJiangsu Institute of Nuclear MedicineWuxi 214063China Department of Radiation Oncology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450000China School of Materials and the Environment Beijing Institute of TechnologyZhuhai 519085China Rigerna Therapeutics Suzhou 215127China

With the development of a small interfering RNA(siRNA)delivery strategy,increasing siRNA therapeutics for tumor treatment appeared in clinical trials and pre-clinical ***,the test results of such therapeutics unveiled that efficient siRNA delivery to tumor tissues is still *** is considered an ideal carrier for delivering hydrophobic agents into tumor tissue because it is highly concentrated and long-circulating in blood and has propensity of tumor ***,we synthesized lipid conjugated siRNAs(LsiRNAs),which showed high affinity to ***,LsiRNAs non-covalently bind to the hydrophobic core of albumin through its octadecyl *** small size of albumin/LsiRNAs allows the complex to penetrate tumor tissue *** test proved that albumin extremely prolonged circulation time and increased tumor retention of associated ***,LsiRNA against programmed death ligand-1(Pdl1)efficiently suppressed tumor growth as well as prolonged survival time of tumor bearing mice by increasing infiltration of CD8^(+)T cells as well as promoted the maturation of dendritic cells both in tumor and ***,LsiRNAs provide a simple but effective way for siRNA tumor delivery that“hitchhikes”on albumin.

关键词： Albumin siRNA Lipid conjugate Tumor treatment Immunotherapy

Catalytic performance of hierarchical H-ZSM-5/MCM-41 for methanol dehydration to dimethyl ether

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Journal of Energy Chemistry 2013年第5期22卷 769-777页

作者： Yu Sang Hongxiao Liu Shichao He Hansheng Li qingze jiao Qin Wu Kening Sun School of Chemical Engineering and the Environment Beijing Institute of Technology

Micro-mesoporous composite molecular sieves H-ZSM-5/MCM-41 were prepared by the hydrothermal technique with alkali-treated H-ZSM-5zeolite as the source and characterized by scanning electron microscopy,transmission electron microscopy,energy dispersive spectroscopy,X-ray diffraction,N2 adsorption-desorption measurement and NH3 temperature-programmed *** catalytic performances for the methanol dehydration to dimethyl ether over H-ZSM-5/MCM-41 were *** these catalysts,H-ZSM-5/MCM-41 prepared with NaOH dosage (nNa/nSi) varying from 0.4 to 0.47 presented excellent catalytic activity with more than 80%methanol conversion and 100%dimethyl ether selectivity in a wide temperature range of 170—300℃,and H-ZSM-5/MCM-41 prepared with nNa/nSi=0.47 showed constant methanol conversion of about 88.7%,100% dimethyl ether selectivity and excellent lifetime at 220℃.The excellent catalytic performances were due to the highly active and uniform acidic sites and the hierarchical porosity in the micro-mesoporous composite molecular *** catalytic mechanism of H-ZSM-5/MCM-41 for the methanol dehydration to dimethyl ether process was also discussed.

关键词： hierarchical porosity H-ZSM-5 composite molecular sieve methanol dehydration dimethyl ether

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废旧轮胎催化裂解研究进展

化工进展 2022年第7期41卷 3877-3889页

作者：杨超矫庆泽冯彩虹赵芸北京理工大学化学与化工学院北京100081 北京理工大学珠海学院材料与环境学院广东珠海519085

废旧轮胎因产量高、难降解、污染环境,被称为最难处理的“黑色垃圾”之一。催化裂解是一种处理废旧轮胎的重要手段,可以实现其高效转化与资源化利用,同时得到高附加值的化学产品,如单环芳烃、低碳烯烃与柠檬烯等。本文基于轮胎的物理结... 详细信息

废旧轮胎因产量高、难降解、污染环境,被称为最难处理的“黑色垃圾”之一。催化裂解是一种处理废旧轮胎的重要手段,可以实现其高效转化与资源化利用,同时得到高附加值的化学产品,如单环芳烃、低碳烯烃与柠檬烯等。本文基于轮胎的物理结构与化学组成、催化裂解过程与裂解产物特征、反应器类型与特征、催化剂类型与作用原理、工艺条件等问题综述了废旧轮胎的催化裂解产物分布规律。通过对比反应器、催化剂与工艺条件对产物分布的影响,进一步分析了当前实现废旧轮胎催化裂解工业化的问题,并基于当前废旧轮胎催化裂解的研究现状,提出应集中设计适应于大规模处理的反应器与配套工艺,同时开发高稳定性与对特定产物高选择性的催化剂,从而实现对废旧轮胎以低能耗、高转化、高价值为特点的资源化利用。

关键词：废旧轮胎热解催化裂解催化剂回收环境

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磁性介孔硅胶负载碱性离子液体催化剂的制备与性能

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化工学报 2014年第12期65卷 4799-4804页

作者：张亚平矫庆泽吴芹黎汉生北京理工大学化工与环境学院北京100081

用巯丙基硅氧烷对磁性介孔硅胶改性,并通过烯丙基官能化离子液体的双键与巯基之间的自由基加成反应将具有不同侧链烷基的离子液体负载到磁性介孔硅胶表面,制备了磁性介孔硅胶负载碱性离子液体催化剂。采用红外光谱分析、X射线衍射、有... 详细信息

用巯丙基硅氧烷对磁性介孔硅胶改性,并通过烯丙基官能化离子液体的双键与巯基之间的自由基加成反应将具有不同侧链烷基的离子液体负载到磁性介孔硅胶表面,制备了磁性介孔硅胶负载碱性离子液体催化剂。采用红外光谱分析、X射线衍射、有机元素分析、氮气物理吸附/脱附分析和样品振动磁强计对催化剂的结构和磁性能进行了表征,最后通过催化三油酸甘油酯与甲醇酯交换反应对其催化性能进行了评价。结果表明,随着离子液体侧链烷基碳个数的增多,磁性介孔硅胶负载离子液体催化剂的离子液体负载量降低,比表面积和孔体积降低。当离子液体侧链烷基为辛基、十二烷基或十六烷基时,油酸甲酯产率均高于95%,并且反应3次后油酸甲酯产率依然高于90%。

关键词：磁性介孔硅胶离子液体催化酯交换反应生物柴油