检索结果-南通市图书馆

Bimetallic CoNi single atoms supported on three-dimensionally ordered mesoporous chromia: highly active catalysts for n-hexane combustion

引用

Green Energy & Environment 2024年第7期9卷 1122-1137页

作者： Xiuqing Hao Yuxi Liu Jiguang Deng Lin Jing Jia Wang wenbo pei Hongxing Dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution Control Key Laboratory of Advanced Functional Materials Education Ministry of China Laboratory of Catalysis Chemistry and Nanoscience Department of Chemical Engineering Faculty of Environment and Life Beijing University of Technology

Developing the alternative supported noble metal catalysts with low cost,high catalytic efficiency,and good resistance toward carbon dioxide and water vapor is critically demanded for the oxidative removal of volatile organic compounds （VOCs）.In this work,we prepared the mesoporous chromia-supported bimetallic Co and Ni single-atom （Co1Ni1/meso-Cr2O3） and bimetallic Co and Ni nanoparticle (CoNPNiNP/mesoCr2O3) catalysts adopting the one-pot polyvinyl pyrrolidone （PVP）-and polyvinyl alcohol （PVA）-protecting approaches,*** results indicate that the Co1Ni1/meso-Cr2O3catalyst exhibited the best catalytic activity for n-hexane (C6H14) combustion (T50%and T90%were 239 and 263℃ at a space velocity of 40,000 mL g-1h-1;apparent activation energy and specific reaction rate at 260℃ were 54.7 kJ mol-1and 4.3×10-7mol g-1cats-1,respectively),which was associated with its higher (Cr5++Cr6+) amount,large n-hexane adsorption capacity,and good lattice oxygen mobility that could enhance the deep oxidation of n-hexane,in which Ni1was beneficial for the enhancements in surface lattice oxygen mobility and low-temperature reducibility,while Co1preferred to generate higher contents of the high-valence states of chromium and surface oxygen species as well as adsorption and activation of n-hexane.n-Hexane combustion takes place via the Mars van Krevelen（MvK） mechanism,and its reaction pathways are as follows:n-hexane→olefins or 3-hexyl hydroperoxide→3-hexanone,2-hexanone or 2,5-dimethyltetrahydrofuran→2-methyloxirane or 2-ethyl-oxetane→acrylic acid→COx→CO2and H2O.

关键词： Three-dimensional ordered mesoporous chromium oxide Supported bimetallic single-atom catalyst Cobalt−nickel single atoms n -Hexane combustion Catalytic reaction mechanism

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enhanced photocatalytic performance of Bi_(4)O_(5)Br_(2)with threedimensionally ordered macroporous structure for phenol removal

引用

Nano Research 2023年第7期16卷 8871-8881页

作者： Kunfeng Zhang Hongxia Chen wenbo pei Hongxing Dai Junshan Li Yongfa Zhu Department of Chemistry Tsinghua UniversityBeijing 100084China College of Environmental Engineering Henan University of TechnologyZhengzhou 450001China Department of Chemistry and Chemical Engineering College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Institute for Advanced Study Chengdu UniversityChengdu 610106China

Herein,a series of three-dimensionally ordered macroporous(3DOM)Bi_(4)O_(5)Br_(2)photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate(PMMA)template *** photocatalytic activity for phenol degradation over 3DOM Bi_(4)O_(5)Br_(2)first increased and then decreased with the rise in macropore ***,3DOM Bi_(4)O_(5)Br_(2)-255(macropore diameter ca.170 nm)exhibits the best photocatalytic activity in the static system,which is about 4.5,7.3,and 11.9 times higher than those of bulk Bi_(4)O_(5)Br_(2),Bi_(2)WO_(6),and g-C_(3)N_(4),***,high phenol conversion(75%)is also obtained over 3DOM Bi_(4)O_(5)Br_(2)-255 in the flow system under full spectrum ***,3DOM Bi_(4)O_(5)Br_(2)-255 also shows strong mineralization capacity owing to the downward shift of valance band position(0.15 V)as compared with Bi_(4)O_(5)Br_(2).Total organic carbon(TOC)removal rate over 3DOM Bi_(4)O_(5)Br_(2)-255(62%)is much higher than that of Bi_(4)O_(5)Br_(2)(17%).The enhancement in photocatalytic performance of 3DOM Bi_(4)O_(5)Br_(2)-255 is attributable to its better phenol adsorption,O_(2)activation,and charge separation and transfer *** work combines the advantages of 3D structure and surface dangling bonds,providing new possibilities for designing highly efficient photocatalysts for pollutants removal.

关键词： three-dimensionally ordered macroporous structure Bi_(4)O_(5)Br_(2) O_(2)activation photocatalysis degradation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare earth oxides and their supported noble metals in application of environmental catalysis

引用

Journal of Rare Earths 2020年第8期38卷 819-839,I0001页

作者： Zhiquan Hou wenbo pei Xing Zhang Kunfeng Zhang Yuxi Liu Jiguang Deng Lin Jing Hongxing Dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaLaboratory of Catalysis Chemistry and NanoscienceDepartment of Chemistry and Chemical EngineeringCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

Volatile organic compounds(VOCs),methane,carbon monoxide,soot,automotive exhaust,and nitrogen oxides are harmful to the atmosphere and human *** is urgent to strictly control their *** catalysis is an effective pathway for the removal of these pollutants,and the critical issue is the development of novel and high-performance *** this review,we briefly summarize the preparation methods,physicochemical properties,catalytic activities,and related reaction mechanisms for the above pollutants removal of the rare earth oxides,mixed rare earth oxide,rare earth oxidesupported noble metal,and mixed rare earth oxide-supported noble metal catalysts that have been investigated by our group and other *** was found that catalytic performance was associated with the factors,such as specific surface area,pore structure,particle size and dispersion,adsorbed oxygen species concentration,reducibility,reactant activation ability or interaction between metal nanoparticles and ***,we also envision the development trend of such a topic in future work.

关键词： Volatile organic compound Atmospheric pollutant Rare earth oxide Mixed rare earth oxide Supported noble metal catalyst Porous mixed rare earth oxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pd/silicalite-1: An highly active catalyst for the oxidative removal of toluene

引用

Journal of Environmental Sciences 2022年第6期34卷 209-219页

作者： Linke Wu Jiguang Deng Yuxi Liu Lin Jing Xiaohui Yu Xing Zhang Ruyi Gao wenbo pei Xiuqing Hao Ali Rastegarpanah Hongxing Dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaLaboratory of Catalysis Chemistry and NanoscienceDepartment of Environmental Chemical EngineeringSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

Catalytic combustion is thought as an efficient and economic pathway to remove volatile organic compounds, and its critical issue is the development of high-performance catalytic materials. In this work, we used the in situ synthesis method to prepare the silicalite-1(S-1)-supported Pd nanoparticles(NPs). It is found that the as-prepared catalysts displayed a hexagonal prism morphology and a surface area of 390-440 m^(2)/g. The sample(0.28Pd/S-1-H)derived after reduction at 500°C in 10 vol% H_(2)showed the best catalytic activity for toluene combustion(T50%= 180℃ and T90%= 189℃ at a space velocity of 40,000 m L/(g·hr), turnover frequency(TOFPd) at 160℃ = 3.46 × 10^(-3)sec^(-1), and specific reaction rate at 160℃ = 63.8μmol/(gPd·sec)), with the apparent activation energy(41 k J/mol) obtained over the bestperforming 0.28Pd/S-1-H sample being much lower than those(51-70 k J/mol) obtained over the other samples(0.28Pd/S-1-A derived from calcination at 500℃ in air, 0.26Pd/S-1-im derived from the impregnation route, and 0.27Pd/ZSM-5-H prepared after reduction at 500℃ in 10 vol% H_(2)). Furthermore, the 0.28Pd/S-1-H sample possessed good thermal stability and its partial deactivation due to CO_(2) or H_(2)O introduction was reversible, but SO_(2) addition resulted in an irreversible deactivation. The possible pathways of toluene oxidation over 0.28Pd/S-1-H was toluene → p-methylbenzoquinone → maleic anhydride, benzoic acid, benzaldehyde → carbon dioxide and water. We conclude that the good dispersion of Pd NPs, high adsorption oxygen species concentration, large toluene adsorption capacity, strong acidity,and more Pd~0 species were responsible for the good catalytic performance of 0.28Pd/S-1-H.

关键词： Silicalite-1 Hexagonal prism shape Supported palladium catalyst Volatile organic compound Toluene combustion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

前锯肌浅、深层平面阻滞对乳腺癌手术围术期镇痛效果的比较

引用

转化医学杂志 2024年第2期13卷 278-283页

作者：刘燕董晶晶裴文博徐方胜贾晋太李春雨长治医学院附属和平医院麻醉科山西长治046000

目的观察前锯肌浅、深层平面阻滞在乳腺癌手术患者围术期的镇痛效果。方法选择2020年8月—2022年7月择期全麻下初次行乳腺癌改良根治术60例,随机分为前锯肌浅层平面阻滞组(S组)、前锯肌深层平面阻滞组(D组)和对照组(C组),每组20例。S... 详细信息

目的观察前锯肌浅、深层平面阻滞在乳腺癌手术患者围术期的镇痛效果。方法选择2020年8月—2022年7月择期全麻下初次行乳腺癌改良根治术60例,随机分为前锯肌浅层平面阻滞组(S组)、前锯肌深层平面阻滞组(D组)和对照组(C组),每组20例。S组与D组分别于麻醉前超声引导下识别前锯肌浅层和深层平面,并注入0.5%罗哌卡因注射液20 mL,注药后30 min利用针刺法测定痛觉减退的范围;C组直接行全身麻醉。记录3组麻醉诱导前、切皮前、切皮后3 min的平均动脉压(MAP)和心率,术中瑞芬太尼用量、出血量和手术时间;记录3组术前、术后24和48 h恢复质量,拔管即刻及术后2 h、6 h、12 h、24 h和48 h安静和咳嗽状态下视觉模拟评分法(VAS)评分,补救镇痛例数及不良反应、并发症发生情况。结果 S组有3例剔除,共纳入17例。S组和D组均可产生锁骨中线~腋后线、第3~6肋节段痛觉阳性区域,但均未超过前正中线;在相同节段D组阳性例数多于S组。与C组相比,S组和D组在切皮后3 min MAP和心率低,术中瑞芬太尼用量、术后12 h和24 h补救镇痛例数减少,术后24 h 15项恢复质量量表评分升高(P0.05),均未发生严重并发症。结论前锯肌浅层和深层平面阻滞均能为乳腺癌手术患者提供满意的围术期镇痛,且与浅层平面阻滞相比,深层平面阻滞在超声下操作更易建立,对手术操作影响小,术后镇痛效果确切。

关键词：乳腺肿瘤乳房切除术根治性前锯肌平面阻滞麻醉和镇痛血流动力学疼痛测定恢复质量

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Encoding biological metaverse: Advancements and challenges in neural fields from macroscopic to microscopic

引用

The Innovation 2024年第3期5卷 30-32页

作者： Yantong Cai wenbo Hu Yao pei Hao Zhao Guangchuang Yu Dermatology Hospital Southern Medical UniversityGuangzhou 266003China Department of Bioinformatics School of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China Tencent AI Lab Shenzhen 518071China State Key Laboratory of Emerging Infectious Diseases School of Public HealthThe University of Hong KongHong Kong SARChina Laboratory of Data Discovery for Health(D24H) Hong Kong Science ParkHong Kong SARChina Institute for AI Industry Research Tsinghua UniversityBeijing 100000China

Neural fields can efficiently encode three-dimensional(3D)scenes,providing a bridge between two-dimensional(2D)images and virtual *** method becomes a trendsetter in bringing the metaverse into vivo *** has initially captured the attention of macroscopic biology,as demonstrated by computed tomography and magnetic resonance imaging,which provide a 3D field of view for diagnostic biological ***,it has also opened up new research opportunities in microscopic imaging,such as achieving clearer de novo protein structure *** this method to the field of biology is particularly significant,as it is refining the approach to studying biological ***,many biologists have yet to fully appreciate the distinctive meaning of neural fields in transforming 2D images into 3D *** article discusses the application of neural fields in both microscopic and macroscopic biological images and their practical uses in biomedicine,highlighting the broad prospects of neural fields in the future biological *** stand at the threshold of an exciting new era,where the advancements in neural field technology herald the dawn of exploring the mysteries of life in innovative ways.

关键词： neural bringing innovative

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light-controlled switchable underwater adhesive

引用

SmartMat 2024年第2期5卷 115-123页

作者： Song Yang Yanfei Ma Chenxi Qin Zhizhi Zhang Jianqing Yu Xiaowei pei Bo Yu wenbo Sheng Feng Zhou Weimin Liu Northwestern Polytechnical University Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringXi'anChina State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouChina Shandong Laboratory of Yantai Advanced Materials and Green Manufacture Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantaiChina

Despite extensive efforts in designing and preparing switchable underwater adhesives,it is not easy to regulate the underwater adhesion strength locally and ***,we design and synthesize photoreversible copolymer of poly[dopamine methacrylamide-co-methoxyethyl-acrylate-co-7-(2-methacryloyloxyethoxy)-4-methylcoumarin].Due to the dynamic formation and breaking of chemical crosslinking networks within the smart adhesives,the material shows widely tunable adhesion strength from∼150 to∼450 kPa and long-range reversible maneuverability under orthogonal 254 and 365 nm ultraviolet light stimulation via the coumarin dimerization and ***,the adhesive exhibits good circulation performance and stability in an acid–base *** also demonstrated that the bolt can be coated with the smart adhesive material for on-demand *** design principle opens the door to the development of remotely controllable high-performance smart underwater adhesives.

关键词： dynamic covalent bonds photoresponsive reversible adhesion switchable adhesion underwater adhesion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

社会主义核心价值观融入京剧艺术教育的探索——基于H高校的京剧艺术实践

引用

化工高等教育 2016年第4期33卷 104-108页

作者：裴文波华东理工大学学生工作部上海200237

牢固的核心价值观都有其固有的根本。培育和弘扬社会主义核心价值观,必须立足中华传统文化。京剧文化蕴含着丰富的道德资源和较高的艺术价值,公正、法治等社会主义核心价值观在京剧文化中也多有体现。本文基于H高校京剧艺术教育的实践,... 详细信息

牢固的核心价值观都有其固有的根本。培育和弘扬社会主义核心价值观,必须立足中华传统文化。京剧文化蕴含着丰富的道德资源和较高的艺术价值,公正、法治等社会主义核心价值观在京剧文化中也多有体现。本文基于H高校京剧艺术教育的实践,探讨了高校校园文化建设存在的问题,明确了社会主义核心价值观融入京剧艺术教育的现实意义,探索在高校京剧文化挖掘、传承和弘扬的实践过程中,将社会主义核心价值观融入京剧艺术教育。

关键词：社会主义核心价值观京剧艺术传统文化校园文化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

分离自羊茅属植物的内生真菌菌株在不同培养基上的生长速度多样性

引用

草业科学 2024年第7期41卷 1650-1659页

作者：刘俊英许文博田沛草种创新与草地农业生态系统国家重点实验室/兰州大学农业农村部草牧业创新重点实验室/兰州大学草地农业教育部工程研究中心/兰州大学草地农业科技学院甘肃兰州730020

为进一步开发利用羊茅属(Festuca)内生真菌,筛选适于内生真菌生长的培养基并比较不同菌株的生长速度,本研究设置了不同的生长培养基,包括不同pH(4、5、6、7、8、9、10),不同碳源(葡萄糖、麦芽糖、乳糖、D-木糖、D-山梨糖醇、可溶性淀粉)... 详细信息

为进一步开发利用羊茅属(Festuca)内生真菌,筛选适于内生真菌生长的培养基并比较不同菌株的生长速度,本研究设置了不同的生长培养基,包括不同pH(4、5、6、7、8、9、10),不同碳源(葡萄糖、麦芽糖、乳糖、D-木糖、D-山梨糖醇、可溶性淀粉),不同氮源(蛋白胨、胰蛋白胨、硝酸钠、硝酸铵、尿素、草酸铵、硝酸钾)和不同培养基[马铃薯葡萄糖琼脂培养基(PDA)、马铃薯蔗糖琼脂培养基(PSA)、察氏培养基(Czapek agar)、玉米粉琼脂培养基(CMA)和水琼脂培养基(WA)],选择11株从羊茅属植物分离的香柱菌属(Epichloë)内生真菌(G1、G2、G3、G4、291-4、291-14A、1、2、9、57A、84F)在这些培养基上进行培养,探究上述菌株在不同培养条件下生长速度的差异。结果表明,培养基种类和pH对内生真菌的生长速度和产孢速度均有显著影响(P<0.05),内生真菌的最适生长pH为4~7,利用能力最强的碳源为D-山梨糖醇,氮源为蛋白胨,菌丝生长较适宜的培养基为PDA和PSA培养基,其中生长速度最快的是菌株1和2,生长速度最慢的菌株是291-4和291-14A。

关键词： pH 氮源碳源培养基生长速度产孢能力菌株

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

BFRP加固砌体墙抗震性能试验研究

引用

河北工业大学学报 2016年第2期45卷 104-110页

作者：赵少伟胡霖嵩裴文博河北工业大学土木工程学院天津300401 河北省土木工程技术研究中心天津300401

为了研究不同加固方式、加固不同损伤程度墙体的抗震性能,通过对玄武岩纤维布(BFRP)加固后的4片墙体进行低周反复荷载试验,并分析其破坏形态、承载力、变形性能、耗能能力、加固效果等.研究结果表明:采用BFRP加固砌体墙的方法,可以不同... 详细信息

为了研究不同加固方式、加固不同损伤程度墙体的抗震性能,通过对玄武岩纤维布(BFRP)加固后的4片墙体进行低周反复荷载试验,并分析其破坏形态、承载力、变形性能、耗能能力、加固效果等.研究结果表明:采用BFRP加固砌体墙的方法,可以不同程度的提升墙体的极限承载力及延性,提高墙体的整体性,延缓刚度退化,从而改善墙体抗震性能.

关键词：砌体结构加固玄武岩纤维布(BFRP) 拟静力试验抗剪承载力抗震性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：