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Pd-Ni nanoparticles supported on titanium oxide as effective catalysts for Suzuki-Miyaura coupling reactions

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 24-31,F0004页

作者： dongxu han Zhiguo Zhang Zongbi Bao Huabin Xing Qilong Ren Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

We have successfully prepared a series of Pd- Ni/TiO2 catalysts by a one-step impregnation-reduction method. Among these catalysts with different compositions of Ni and Pd, the one with the Ni：Pd ratio of 2.95 showed the best activity. Small monodispersed Pd-Ni bimetallic nanoparticles were loaded on the surface of titanium oxide nanopowder as confirmed with TEM and EDS mapping. The XPS analysis demonstrated that Pd exists as 31% Pd（II） species and 69% Pd（0） species and all nickel is Ni（II）. The prepared Pd-Ni/TiO2 exhibited enhanced catalytic activity compared to an equal amount of Pd/TiO2 for Suzuki-Miyaura reactions together with excellent applicability and reusability.

关键词： Pd-Ni bimetallic nanoparticles nanocatalysis Suzuki-Miyaura reaction titanium oxide

基于氧化应激生物标志物的抗生素制药废水生态风险评价

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安全与环境工程 2024年第3期31卷 272-280页

作者：沈洪艳韩冬旭赵浩哲杨雷孙昊宇唐量河北科技大学环境科学与工程学院河北石家庄050018 河北省药用分子化学重点实验室河北石家庄050018 河北化工医药职业技术学院质量检测与管理系河北石家庄050026 上海大学有机复合污染控制工程教育部重点实验室上海200444

近年来我国制药产业发展迅速,由此产生了大量的制药废水。制药废水尤其是抗生素制药废水的排放,对水环境造成了潜在威胁。以石家庄市某制药厂达标排放的抗生素制药废水为研究对象,将斑马鱼暴露于不同浓度的抗生素制药废水中(体积分数为... 详细信息

近年来我国制药产业发展迅速,由此产生了大量的制药废水。制药废水尤其是抗生素制药废水的排放,对水环境造成了潜在威胁。以石家庄市某制药厂达标排放的抗生素制药废水为研究对象,将斑马鱼暴露于不同浓度的抗生素制药废水中(体积分数为10%、40%、70%),分别于第3、6、9、12、15天测定斑马鱼肌肉组织中活性氧自由基(ROS)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽(GSH)、丙二醛(MDA)和磷酸化组蛋白H2AX(γ-H2AX)6项氧化应激生物标志物的活性或含量,并基于生物标志物测定结果计算基于改进的综合生物标志物响应指数(IBR v2)以评价其生态风险。结果表明:抗生素制药废水的胁迫使斑马鱼肌肉组织产生了氧化应激反应,但不同实验组之间的响应时间存在差异,暴露第6天时,70%实验组的ROS含量、CAT活性、GSH含量、MDA含量和γ-H2AX含量均较对照组发生了显著的变化(p<0.001),响应时间早于10%和40%实验组,表明高浓度抗生素制药废水胁迫能够快速诱导斑马鱼产生氧化应激反应;基于6项肌肉组织氧化应激生物标志物的IBR v2值计算结果显示,达标排放的抗生素制药废水仍具有较高的环境风险,且高浓度的制药废水产生的生态风险更加快速和持久。本研究可为抗生素制药废水生态风险评价和相关排放标准的制定和完善提供参考。

关键词：抗生素制药废水生态风险评价斑马鱼氧化应激生物标志物综合生物标志物响应指数

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非金属PE管材氢气-甲烷渗透研究进展

材料导报 2024年第16期38卷 258-268页

作者：郑度奎李敬法宇波黄志强张引弟刘翠伟赵杰韩东旭长江大学石油工程学院武汉430100 北京石油化工学院机械工程学院并氢能研究中心北京102617 中国石油大学(华东)储运与建筑工程学院山东青岛266580

采用非金属聚乙烯(PE)管道输送纯氢和掺氢天然气可有效避免金属管道的氢脆。但由于材料特性,PE管道在输送过程中存在一定程度的气体渗漏,造成能源浪费和引发安全问题。为选择合适的PE管材和确定输送条件,需深入揭示氢气/甲烷在PE材料中... 详细信息

采用非金属聚乙烯(PE)管道输送纯氢和掺氢天然气可有效避免金属管道的氢脆。但由于材料特性,PE管道在输送过程中存在一定程度的气体渗漏,造成能源浪费和引发安全问题。为选择合适的PE管材和确定输送条件,需深入揭示氢气/甲烷在PE材料中的渗透扩散机理和了解研究方法。本文以文献调研的方式,在微观角度从溶解和扩散两方面揭示了气体在PE材料中的渗透机理;综述了常用于研究氢气、甲烷和氢气/甲烷混合气体在PE材料中溶解、扩散和渗透性能的常用实验方法和数值模拟方法的研究进展,其中实验方法主要有膜渗透实验法和全尺寸渗透实验法,数值模拟方法主要有分子动力学模拟法和数学模型法。根据研究进展,讨论并指出了实验方法和数值模拟方法中存在的问题,并针对当前研究的不足指出了未来的研究重点和发展趋势。本文可为纯氢及掺氢天然气在PE管道中的安全输送提供参考。

关键词：氢气聚乙烯管道渗透性能溶解度系数扩散系数实验研究分子动力学模拟

Modeling of Hydrogen Blending on the Leakage and Diffusion of Urban Buried Hydrogen-Enriched Natural Gas Pipeline

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1315-1337页

作者： Yue Su Jingfa Li Bo Yu Yanlin Zhao dongxu han Dongliang Sun Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation EngineeringChina University of Petroleum(Beijing)Beijing102249China School of Mechanical Engineering&Hydrogen Energy Research Centre Beijing Institute of Petrochemical TechnologyBeijing102617China

With the introduction of various carbon reduction policies around the world,hydrogen energy,as a kind of clean energy with zero carbon emission,has attracted much *** safe and economical transportation of hydrogen is of great significance to the development of hydrogen energy *** natural gas pipelines to transport hydrogen is considered to be an efficient and economical ***,hydrogen has a higher risk of leakage due to its strong diffusion capacity and lower explosive limit than conventional natural ***,it is of great significance to study the leakage and diffusion law of hydrogen-enriched natural gas(HENG)pipelines for the safe transportation of hydrogen *** this study,the leakage and diffusion characteristics of urban buried HENG pipelines are investigated numerically,and the dangerous degree of leakage is analyzed based on the time and area when the gas concentration reaches the lower explosive *** influences of hydrogen blending ratio(HBR),operating pressure,leakage hole size and direction,as well as soil type on the leakage and diffusion law of HENG are *** show that the hydrogen mixing is not the key factor in increasing the degree of risk after gas leakage for urban buried HENG *** the HBR is 5%,10%,15% and 20%,the corresponding first dangerous time is 1053,1041,1019 and 998 s,*** is expected to provide a valuable reference for the safe operation and risk prevention of HENG pipelines in the future.

关键词： Hydrogen energy pipeline leakage diffusion characteristics explosive limit transportation safety

Study on a Dual Embedded Discrete Fracture Model for Fluid Flow in Fractured Porous Media

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Computer Modeling in Engineering & Sciences 2020年第7期124卷 5-21页

作者： Heng Zhang Tingyu Li dongxu han Daobing Wang Dongliang Sun Bo Yu School of Mechanical Engineering Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil&Gas DevelopmentBeijing Institute of Petrochemical TechnologyBeijing102617China School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an710049China

Simulation of fluid flow in the fractured porous media is very important and *** have developed some models for fractured porous *** the development of related research in recent years,the prospect of embedded discrete fracture model(EDFM)is more and more ***,since the size of the fractures in the actual reservoir varies greatly,a very fine grid should be used which leads to a huge burden to the computing *** address this challenge,in the present paper,an upscaling based model is *** this model,the flow in large-scale fractures is directly described by the EDFM while that in the small-scale fractures is upscaled through local simulation by *** EDFM is used to simulate the large-and small-scale fractures independently two times,so the new model is called dual embedded discrete fracture model(D-EDFM).In this paper,the detailed implementation process of D-EDFM is introduced and,through test cases,it is found the proposed model is a feasible method to simulate the flow in fractured porous media.

关键词： Dual embedded discrete fracture model(D-EDFM) local upscaling fractured

Investigation of High-Stability Temperature Control in Primary Gas Thermometry

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Journal of Thermal Science 2022年第3期31卷 765-776页

作者： HU Jiangfeng ZhanG Haiyang SONG Yaonan PAN Changzhao GAO Bo LIU Wenjing han dongxu ZhanG Zhen LUO Ercang PITRE Laurent TIPC-LNE Joint Laboratory on Cryogenic Metrology Science and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100490China Laboratoire national de métrologie et d’essais-Conservatoire national des arts et métiers F93210La Plaine-Saint DenisParisFrance School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China

We presented a relationship between the temperature control and measurement stability limit and the temperature resolution,particularly for using rhodium-iron resistance thermometers and AC resistance *** on this,temperature control was investigated and demonstrated in primary gas thermometry under various working *** optimized parameters,micro-Kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 *** temperature control stabilities are better than 8μK over 180 h with an integration time of 33.6 s in the concerned temperature range,closing to the limit that the sensors and the instruments can control and *** stabilities were significantly improved about(44±8)%at 24.5 K and(70±7)%at 5 K comparing with our previous work(Chen et al.,Cryogenics,2019,97:1–6).

关键词： temperature control temperature stability temperature resolution rhodium-iron resistance thermometer primary gas thermometry

Chinese SPRIGT realizes high temperature stability in the range of 5–25 K

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Science Bulletin 2018年第12期63卷 733-734页

作者： Bo Gao Changzhao Pan Laurent Pitre Yanyan Chen Haiyang Zhang Yaonan Song Hui then Wenjing Liu dongxu han Ercang Luo Key taboratoly of Cryogenics Technical Institute of Physics and Chemistry(TIPC)Chinese Academy of Sciences(CAS)Beijing 100190China Laboratoire notional de mêtrologie Et d'essais-Consen atoire national des arts et mêtiers(LNE-Cnam)F-93210 La PlaineFrance School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power EngineeringXi'an Jiaotong universityXi'an 710049China

The unit of thermodynamic temperature,the kelvin,is one of the seven base units of International System of *** accuracy measurements of thermodynamic temperature in the lowtemperature range,namely below the neon tripl... 详细信息

关键词：温度稳定性中国放射设备同步加速器 ities 绝对温度温度范围科学研究

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油气综合立体调运关键技术现状与趋势

前瞻科技 2024年第2期3卷 39-49页

作者：李长俊宇波张对红杨毅苏怀虞维超韩东旭贾文龙西南石油大学石油与天然气工程学院成都610500 北京石油化工学院机械工程学院北京102617 国家石油天然气管网集团有限公司科学技术研究总院分公司天津300450 国家石油天然气管网集团有限公司油气调控中心北京100028 中国石油大学(北京)机械与储运工程学院北京102249

油气调运系统是以油气管道为主体,道路、轨道、水路等多种调运方式协同构成、既相互独立性又彼此关联的交通运输网络系统,但中国的油气调运仍以单一管道、道路、轨道、水路调运方式为主。统筹考虑各种方式的油气调运规律,以及不同调运... 详细信息

油气调运系统是以油气管道为主体,道路、轨道、水路等多种调运方式协同构成、既相互独立性又彼此关联的交通运输网络系统,但中国的油气调运仍以单一管道、道路、轨道、水路调运方式为主。统筹考虑各种方式的油气调运规律,以及不同调运方式之间的匹配衔接关系,实现多种油气调运方式与运载工具组合、调运路径与设备设施的全局优化配置,是保障国家能源供应安全的重大需求。文章总结了天然气、成品油、原油的调运模式及管道、道路、轨道、水路调运的关键技术现状;指出了推动管道、道路、轨道、水路多种调运方式融合,建立油气综合立体调运系统,提升油气调运经济性、安全性、时效性、灵活性和韧性的发展趋势;阐述了油气综合立体调运大数据技术、调运网络耦合机制、调运系统一体化大模型仿真、调运优化决策、油气综合立体仿真优化调运平台开发5个方向面临的挑战;提出了4方面的理论技术研究和政策建议。

关键词：综合立体油气调运多网融合协同运行

Low-content and highly effective zoned Rh and Pd three-way catalysts for gasoline particulate filter potentially meeting Euro 7

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Journal of Rare Earths 2023年第6期41卷 905-916,I0004页

作者： Ying Xin hanxue Zhang Pan Li Ningning Qu Ahui Tang Fuzhen Yang dongxu han Junxiu Jia Jin Wang Lirong Zheng Zhaoliang Zhang School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsUniversity of JinanJinan 250022China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034China

The next-generation Euro 7 standard proposed much lower pollutant limits from gasoline vehicles,specifically for CO and NO_(x),which would be challenging for the three-way catalysts(TWCs)utilized commercially to eliminate these *** with reductive(Rh)and oxidative(Pd)active components on gasoline particulate filters(TWC on GPF)play importantly auxiliary roles in the remediation of CO and NO_(x)downstream the close coupled TWCs to meet their emission ***,a low-content Rh-based TWC(0.17 wt%)zoned with a less expensive Pd-based TWC(0.29 wt%)for GPF applications(cGPF)is reported using improved colloidal deposition *** supporting of Rh on Y-stabilized ZrO_(2)rather than on CeO_(2)-ZrO_(2)inhibits the formation of inactive Ce rhodate species,while Pd on CeO_(2)-ZrO_(2)not only guarantees the high oxygen storage capacity(OSC)but also enhances catalytic *** layout of the front one-fifth in volume being 0.29 wt%Pd on Ce_(0.43)Zr_(0.5)7O_(2)and the rear four-fifths being 0.17 wt%Rh on Zr_(0.85)Y_(0.15)O_(2)prevents the possible alloying of Rh with *** highly effective zoned Rh and Pd TWCs show synergistic three-way activity before and after severe hydrothermal aging at 1000℃with 10%water for24 h,which could be potential choices for close coupled GPF application to satisfy the upcoming stringent emission standards,such as Euro 7 and China 6b.

关键词： Three-way catalyst Zoned catalyst Ultra-low platinum group metal loading Gasoline particulate filter Oxygen storage capacity Rare earths