检索结果-南通市图书馆

Nano Research 2019年第12期12卷 3085-3088页

作者： Zhenhui Ma Hu Liu Ming Yue College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China MIIT Key Laboratory of Critical Materials Technology for New energy Conversion and storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Using non-noble metal catalysts to chemoselectively reduce the 3-nitrostyrene into 3-vinylaniline is extremely attractive due to the importantapplications of aromatic ***,the separation and recycle of catalytic particles to sustainably catalyze are still challenging on accountof their small *** this communication,we report a novel magnetically recyclable catalyst of Sm2Co17/Cu to chemoselectively reduce3-nitrostyrene into 3-vinylaniline by activating ammonia borane(AB)to yield *** Sm2Co17/Cu,composited of 180 nm Sm2Co17nano magnet and 10 nm Cu catalyst nano particles,shows a high conversi on(98%)and a high selectivity(99%)for 3-nitrostyrene under ultrasonic *** importantly,they are easily collected by self-separation method without any magnetic *** a consequenee,the excellent recyclable feature is acquired even underwent 10 *** approach provides a green strategy to synthesize magneticallyrecyclable catalysts.

关键词： Sm2Co17/Cu chemoselective catalysis 3-nitrostyrene magnetic recycle

Si/C Composites as Negative Electrode for High energy Lithium Ion Batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第1期35卷 21-29页

作者： Yi Zhang Yusong Zhu Lijun Fu Jixing Meng Nengfei Yu Jing Wang Yuping Wu College of energy and Institute for Electrochemical energy storage Nanjing Tech University Nanjing Jiangsu 211816 China Jiangsu Key Laboratory of Engineering Mechanics School of Civil Engineering Southeast University Nanjing Jiangsu 210096 China

Silicon is very promising negative electrode materials for improving the energy density of lithium-ion batteries （LIBs） because of its high specific capacity, moderate potential, environmental friendliness, and low cost. However, the volume variation of Si negative electrodes is huge during lithiation/delithiation processes which results in pulverization, low cycling efficiency, and permanent capacity loss. In order to overcome this problem, tremendous efforts have been attempted. Among them the most successful strategy is to incorporate other components into silicon to form composite, especially the carbon medium. In this mini review, the recent progress on Si/C materials used as negative electrode of LIBs is summarized such as Si/amorphous carbon composite, Si/graphene composites, Si/carbon nanotubes or fibers composites. The fabrication, structure, electrochemical performances of different Si/C composites are discussed. In addition, some future directions are pointed out.

关键词： lithium-ion batteries silicon Si/C composites negative electrodes

N-hydroxyphthalimide anchored on hexagonal boron nitride as a metal-free heterogeneous catalyst for deep oxidative desulfurization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2022年第3期19卷 1382-1389页

作者： Lin-Jie Lu Pei-Wen Wu Jing He Ming-Qing Hua Yan-Hong Chao Ning Yang Lin-Lin Chen Wei Jiang Lei Fan Hong-Bing Ji Wen-Shuai Zhu School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiangJiangsu212013PR China School of Pharmacy Jiangsu UniversityZhenjiangJiangsu212013PR China Yangzhou University YangzhouJiangsu225002PR China Fine Chemical industry Research Institute School of ChemistrySun Yat-sen UniversityGuangzhouGuangdong510275PR China

A metal-free N-hydroxyphthalimide/hexagonal boron nitride(NHPI/h-BN)catalytic system was developed for deep oxidative desulfurization(ODS)of fuel *** experiments find that the heterogenization process of loading NHPI on h-BN not only benefits to the dispersion and utilization of NHPI,but also can significantly promote the catalytic *** employing NHPI/h-BN as the catalyst,azodiisobutyronitrile(AIBN)as the metal-free initiator,a 95%conversion of dibenzothiophene(DBT)can be acquired under the reaction conditions of 120°C and atmospheric pressure with molecular oxygen(O_(2))as ***,the heterogenization is convenient for the regeneration of the catalyst with>94%DBT conversion after being recycled seven *** illustrate that the promoted catalytic activity along with the regenerability originate from the interactions between NHPI and *** catalytic mechanism study shows that molecular oxygen is readily activated by the NHPI/h-BN to form a superoxide radical(O_(2)^(·-)),which oxidize DBT to DBTO2 for desulfurization.

关键词： N-hydroxyphthalimide Hexagonal boron nitride Oxidative desulfurization Heterogeneous catalysis

Optimizing zeolite stabilized Pt-Zn catalysts for propane dehydrogenation

在线全文

学校读者我要写书评

暂无评论

Journal of energy Chemistry 2021年第6期30卷 92-98,I0003页

作者： Linjun Xie Yuchao Chai Lanlan Sun Weili Dai Guangjun Wu Naijia Guan Landong Li School of Materials Science and Engineering&national Institute for Advanced Materials Nankai UniversityTianjin 300350China Key Laboratory of Advanced energy Materials Chemistry of Ministry of education Nankai UniversityTianjin 300071China

Propane dehydrogenation(PDH)provides an alternative route to non-petroleum based propylene and eligible catalysts with good overall performance are still being ***,we report the construction of zeolite stabilized Pt-Zn catalysts Pt-Zn/Si-Beta for *** results from transmission electron microscopy(TEM),ultraviolet-visible(UV-vis)and Fourier transform infrared(FTIR)spectroscopy reveal that highly-dispersed Zn species are stabilized by the silanols from zeolite framework dealumination,which then act as the anchoring sites for Pt *** close contact between Pt-Zn species and the electronic interaction thereof make Pt-Zn/Si-Beta robust PDH *** optimized conditions,a high propylene production rate of 4.11 molmol_(Pt)^(-1)s^(-1),high propylene selectivity of 98% and a sustainable deactivation rate of~0.02 h^(-1)can be simultaneously achieved at 823 *** deposition is not the key reason for the catalytic deactivation,while the loss of Zn species and the resulting aggregation of Pt species under high temperatures are responsible for the irreversible deactivation of Pt-Zn/Si-Beta catalyst in PDH reaction.

关键词： Propane dehydrogenation Zeolite Pt-Zn/Si-Beta Deactivation

Pressure drop of TiO_2 nanofluid in circular pipes

在线全文

学校读者我要写书评

暂无评论

Particuology 2011年第5期9卷 486-491页

作者： Tun-Ping Teng Yi-Hsuan Hung Ching-Song Jwo Chien-Chih Chen Lung-Yue Jeng Department of Industrial education National Taiwan Normal University Taipei City 10610 Taiwon China Department of energy and Refrigerating Air-Conditioning Engineering National Taipei University of Technology Toipei City 10608 Taiwan China Graduate Institute of Mechanical and Electrical Engineering National Taipei University of Technology Taipei City 10608 Taiwan China

This paper discusses the pressure drop in circular pipes of TiO2/water nanofluid for both laminar and turbulent flows at different temperatures and TiO2 weight fractions. This study shows that TiO2/water nanofluid causes enhancement, but temperature rise reduces pressure drop. The proportional increase in pressure drop for turbulent flow is lower than that for laminar flow. The traditional equation for pressure drop fails to accurately estimate the pressure drop for laminar and turbulent flows. Accordingly, this study developed new empirical equations for the friction factor for both laminar and turbulent flows, and the maximum deviations between calculated and experimental results were reduced to within the ranges of-6.17% to 3.55% and -3.08% to 3.81%, respectively, that is, for TiO2/water nanofluid, the correlations apply better to turbulent than to laminar flow.

关键词： Titania (TiO2) Nanofluid Laminar flow Turbulent flow

Constructing a multifunctional mesoporous composite of metallic cobalt nanoparticles and nitrogen-doped reduced graphene oxides for high-performance lithium-sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Carbon energy 2022年第2期4卷 142-154页

作者： Luhai Gai Chenhao Zhao Ya Zhang Zhibiao Hu Qiang Shen Key Laboratory for Colloid and Interface Chemistry of education Ministry School of Chemistry and Chemical EngineeringShandong UniversityJinanChina Fujian Provincial Key Laboratory of Clean energy Materials College of Chemistry&MaterialsLongyan UniversityLongyanChina

Electrochemical properties of lithium-sulfur(Li-S)batteries are mainly hindered by both the insulating nature of elemental sulfur(i.e.,molecular S8)and the shuttling effect or sluggish redox kinetics of lithium polysulfide intermediates(Li_(2)S_(n),3≤n≤8).In this paper,a three-dimensional mesoporous reduced graphene oxide-based nanocomposite,with the embedding of metallic Co nanoparticles and the doping of elemental N(Co/NrGO),and its simply ground mixture with powdered S at a mass ratio of 1:6(Co/NrGO/S)are prepared and used as cathode-/separator-coated interlayers and working electrodes in assembled Li-S cells,*** of the effective cell configurations is to paste composite Co/NrGO onto both the S-loading cathode and separator,showing good cycling stability(1070mAh g^(−1) in the 100th cycle at 0.2 C),highrate capability(835mAh g^(−1),2.0 C),and excellent durability(905mAh g^(−1) in the 250th cycle at 0.5 or 0.2 C).Compared with the experimental results of Co-absent NrGO,electrochemical properties of various Co/NrGO-based cell configurations clearly show multiple functions of Co/NrGO,indicating that the absence of Co/NrGO coatings and/or Co nanoparticles may be inadequate to achieve superior S availability of assembled Li-S batteries.

关键词： high-performance mechanism lithium-sulfur batteries multifunctional three-dimensional mesoporous reduced graphene oxide-based nanocomposite

Ca-and Mg-rich waste as high active carrier for chemical looping gasification of biomass

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第10期34卷 145-154页

作者： Xin Niu Laihong Shen School of energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of energy Thermal Conversion and Control of Ministry of education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Chemical looping gasification(CLG)is a promising technology for high-quality syngas *** key issue to successful CLG is the selection of high-performance oxygen *** this study,several Ca-and Mg-rich steelmaking wastes from steel industry,such as blast furnace slag(BF slag),blast furnace dust(BF dust)and Linz-Donawitz converter slag(LD slag),were used as oxygen carriers in chemical looping gasification of *** results showed that the reducibility of Ca-and Mg-rich waste,especially LD slag and BF dust,was superior to that of *** long-term operation,the cyclic stability of steelmaking waste was *** dust showed a poor stability,while the other carrier(hematite,BF slag or LD slag)presented an excellent stability during multiple redox cycles in spite of partial sintering and ***,the effects of supply oxygen coefficient(O/B ratio)and reaction temperature on CLG of biomass were *** results revealed that Ca-and Mg-rich waste exhibited a higher syngas production compared to *** higher performance could be attributed to the improved reduction rate of Fe2O3 and gasification rate of biomass by Ca or Mg in steelmaking *** addition,LD slag exhibited the higher gas value at the O/B ratio of 1 at 900℃.As a consequence,LD slag was an appropriate oxygen carrier for CLG of biomass in terms of perfect reducibility,superior cyclic stability and high reactivity.

关键词： Biomass Syngas Gasification Ca-and Mg-rich waste Chemical looping

Comparative transcriptome analysis between abundant and deficient spore strains provides novel insight into gene regulatory networks and mechanisms of monospore production in bladed Bangiales

在线全文

学校读者我要写书评

暂无评论

渔业学报（英文） 2023年第2期8卷 124-134页

作者： Qingjie Zhang Shanshan Song Dahai Gao Xinghong Yan Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Shanghai Ocean UniversityMinistry of EducationShanghai201306China national Demonstration Center for Experimental Fisheries Science education Shanghai Ocean UniversityShanghai201306China Shanghai Engineering Research Center of Aquaculture Shanghai201306China

As an important seedling source,monospores closely associate with yields in nori ***,the molecular mechanism underlying differences in monospore production for different strains remains *** transcriptome analysis was performed to examine gene expression differences between the spore abundant wild-type strain(WT)and spore deficient mutant(Y1)of Pyropia *** WT strain that produces monospores in abundance exhibited more differentially expressed genes(DEGs)in both number and higher fold-changes than the Y1 strain incapable of producing monospores,indicating that the specific regulation of genes is involved in monospore *** lists of DEGs were obtained between the two strains using intersection and displayed in Venn diagram:one expressed only in WT strain,another expressed only in Y1 strain,and the third shared in both *** annotated as homologous genes of Arabidopsis thaliana in these 3 lists were curated for online functional enrichment analysis on Metascape *** regulatory networks of WT were functionally enriched in the processing,proteolysis,and transport of proteins,especially within the small GTPase protein family,which might be account for the monospore production ability,whereas Y1 were functionally enriched in the metabolism of essential substance and utilization of indispensable energy,which might be account for the rapid growth of *** found the differentially enriched gene regulatory networks between strains might be the intrinsic mechanisms of the different monospore production *** findings provide novel insights into the genes and regulatory networks associated with monospore production abilities,which are essential for developing accurate breeding technologies for optimal release of monospores and increase of total nori production.

关键词： Pyropia chauhanii Monospore Archeospore Comparative transcriptome Gene regulatory network

Ambient volatile organic compounds at a receptor site in the Pearl River Delta region:Variations,source apportionment and effects on ozone formation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第1期34卷 104-117页

作者： Yao Meng Junwei Song Lewei Zeng Yingyi Zhang Yan Zhao Xufei Liu Hai Guo Liuju Zhong Yubo Ou Yan Zhou Tao Zhang Dingli Yue Senchao Lai The Key Lab of Pollution Control and Ecosystem Restoration in industry Clusters Ministry of Educationand Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution ControlSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Institute of Meteorology and Climate Research Karlsruhe Institute of TechnologyHermann-von-Helmholtz-Platz 1Eggenstein-Leopoldshafen 76344Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina Guangdong Environmental Monitoring Center State Environmental Protection Key Laboratory of Regional Air Quality MonitoringGuangzhou 510308China Guangdong Polytechnic of Environmental Protection Engineering Foshan 528216China

We present the continuously measurements of volatile organic compounds(VOCs)at a receptor site(Wan Qing Sha,WQS)in the Pearl River Delta(PRD)region from September to November of *** average mixing ratios of total VOCs(TVOCs)was 36.3±27.9 ppbv with the dominant contribution from alkanes(55.5%),followed by aromatics(33.3%).The diurnal variation of TVOCs showed a strong photochemical consumption during daytime,resulting in the formation of ozone(O_(3)).Five VOC sources were resolved by the positive matrix factorization(PMF)model,including solvent usage(28.6%),liquid petroleum gas(LPG)usage(24.4%),vehicle exhaust(21.0%),industrial emissions(13.2%)and gasoline evaporation(12.9%).The regional transport air masses from the upwind cities of south China can result in the elevated concentrations of *** ratios of TVOCs/NO_(x)(1.53±0.88)suggested that the O_(3) formation regime at WQS site was VOC-limited,which also confirmed by a photochemical box model with the master chemical mechanism(PBM-MCM).Furthermore,the observation on high-O_(3) episode days revealed that frequent O_(3) outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical *** study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.

关键词： Volatile organic compounds(VOCs) Pearl River Delta(PRD)region Source apportionment Ozone(O_(3)) Regional transport

Spatially-separated redox sites enabling selective atmospheric CO_(2)photoreduction to CH_(4)

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第7期66卷 1997-2003页

作者： Yang Wu Mingyu Wu Juncheng Zhu Xiaojing Zhang Jing Li Kai Zheng Jun Hu Chengyuan Liu Yang Pan Junfa Zhu Yongfu Sun Yi Xie Hefei national Research Center for Physical Sciences at Microscale National Synchrotron Radiation LaboratorySchool of Chemistry and Materials Scienceand iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

CO_(2)photoreduction to high-valued CH_(4)is highly attractive,whereas the CH_(4)selectivity and activity,especially under atmospheric CO_(2),is still ***,we design spatially-separated redox sites on two-dimensional heterostructured nanosheets with loaded metal oxides,thus achieving high reactivity and selectivity of photocatalytic atmospheric CO_(2)reduction to CH_(4).Taking the synthetic In_(2)O_(3)/In_(2)S_(3)nanosheets with loaded PdO quantum dots as a prototype,quasi in-situ X-ray photoelectron spectra reveal the Pd sites accumulate photogenerated holes for dissociating H_(2)O and the In sites accept photoexcited electrons to activate CO_(2).Moreover,the Pd-OD bond is confirmed by in-situ Fourier-transform infrared spectra during the D2O labeling experiment,indicating the PdO quantum dots participate in H_(2)O oxidation to supply hydrogen species for CO_(2)*** a result,in a simulated air atmosphere,the PdO-In_(2)O_(3)/In_(2)S_(3)nanosheets enable favorable atmospheric CO_(2)-to CH_(4)photoreduction with nearly 100%selectivity and ultralong stability of 240 h as well as CO_(2)conversion of 48.2%.This study opens an approach towards designing photocatalysts with spatially-separated redox sites to achieve efficient oxidation and reduction of CO_(2)photocatalysis to CH_(4).

关键词： atmospheric CO_(2)photoreduction to CH_(4) spatially-separated redox sites quantum dots 2D heterostructured nanosheets