检索结果-南通市图书馆

Industrial Chemistry & Materials 2024年第4期2卷 587-599页

作者： Sara Rozas Fabiana C.Gennari Mert Atilhan Alfredo Bol Santiago Aparicio Department of Chemistry University of Burgos09001 BurgosSpain National Scientific and Technical Research Council(CONICET) Bariloche Atomic Centre(CNEA)R8402AGPS.C.de BarilocheRio NegroArgentina Department of Chemical and Paper Engineering Western Michigan UniversityKalamazooMI 49008-5462USA Department of Physics University of Burgos09001 BurgosSpain International Research Center in Critical Raw Materials for Advanced Industrial Technologies(ICCRAM) University of Burgos09001 BurgosSpain

This work presents a theoretical investigation of carbon dioxide(CO_(2))adsorption on MgH_(2) and its reaction(chemisorption)with cobalt doped MgH_(2).The focus of this study is the properties and mechanisms involved in CO_(2) adsorption on clean MgH_(2) surfaces and the role of Co in enhancing the adsorption *** functional theory(DFT)calculations were performed to examine different CO_(2) adsorption sites on the MgH_(2) surface along with the adsorption distances,binding energies,and geometric *** results indicate that physical adsorption of CO_(2) occurs on MgH_(2) with similar adsorption energies at different adsorption *** coverage effect of CO_(2) molecules on MgH_(2) was also investigated,revealing an increased affinity of CO_(2) with higher surface ***,excessive coverage led to a decrease in adsorption efficiency due to competing surface adsorption and intermolecular *** orientation of adsorbed CO_(2) molecules shifted from parallel to quasiperpendicular arrangements upon adsorption,with notable deformations observed at higher coverage,which gives a hint of CO_(2) ***,the study explores the CO_(2) adsorption capacity of MgH_(2) in comparison to other materials reported in the literature,showcasing its medium to strong affinity for CO_(2).Additionally,the effectiveness of a single Co atom and Co clusters as catalysts for CO_(2) adsorption on MgH_(2) was ***,this theoretical investigation provides insights into the CO_(2) adsorption properties of MgH_(2) and highlights the potential of Co catalysts to enhance the efficiency of the methanation process.

关键词： DFT CO_(2)conversion cobalt catalyst Charge transfer

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

Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

引用

Journal of Energy Chemistry 2013年第4期22卷 582-590页

作者： Ali Karimi Bahram Nasernejad Ali Morad Rashidi Chemical Engineering Department Amir Kabir University of Technology Nanotechnology Research Center Research Institute of Petroleum Industry

Multiwall carbon nanotubes （MWNTs） and alumina are combined to give a new type of nanohybrid for Fisher-Tropsch synthesis （FTS） catalyst support. Alumina nano-particles （10 wt%） were introduced directly on functionalized MWNTs by a modified sol-gel method. Microstructure observations show that alumina particles were homogeneously dispersed on the inside and outside of modified MWNTs surfaces. 15 wt% cobalt loading catalysts were prepared with this nanohybrid and γ-alumina as a reference, using a sol-gel technique and wet impregnation method respectively. These catalysts were characterized by TEM, XRD, N2-adsorption, H2 chemisorption and TPR. The deposition of cobalt nanoparticles synthesized by sol-gel technique on the MWNTs nanohybrid shift the reduction peaks to a low temperature, indicating higher reducibility for uniform cobalt particles. Nanohybrid also aided in high dispersion of metal clusters and high stability and performance of catalyst. The proposed MWNTs nanohybrid-supported cobalt catalysts showed the improved FTS rate （gHc/（***））, CO conversion （%）, and water gas shift rate （WGS）（gcoz/（gcat.h）） of 0.012, 52, and 30E-3, respectively, as compared to those of 0.007, 25, and 18E-3, respectively, on the γ-alumina-supported cobalt catalysts with the same Co loading.

关键词： carbon nanotubes nanohybrid cobalt catalyst alumina FT synthesis sol-gel

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

Visible light-driven water oxidation using metal oxide quantum dots modified with a cobalt catalyst

Visible light-driven water oxidation using metal oxide quant...

引用

中国化学会第九届全国无机化学学术会议

作者： Fujun Niu Ning Zhang Shaohua Shen Liejin Guo International Research Center of Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong University

Conversion of sunlight to chemical fuels is the holy grail to deal with the energy and environment issue.1,2 Inspired by the natural photosynthesis, molecular based photocatalytic system has been widely investigated. Generally speaking, such a system contains three part: a sensitizer to absorb light, a reduction catalyst to generate H2, and an oxidation catalyst to produce O2. The oxidation of water has been proved to be the key of the entire water splitting process, as the reaction kinetic limitation step.3 In this work, we developed a novel system with Co3O4 quantum dots（QDs） or Fe2O3 QDs as photosensitizer, a salophen cobalt（II） complex（Co SLP） as catalyst, and persulfate（S2-2O8） as the sacrificial electron acceptor（Fig. 1）. The photocatalytic oxygen evolution rate of the systems were 75μmol/h/g and 84μmol/h/g over the cobalt（II） complex when Co3O4 QDs or Fe2O3 QDs was employed, respectively. While no O2 evolution were observed when either salophen cobalt（II） complex or QDs was absent. This high efficiency might be attributed to the interfacial hole transfer from photoexcited QDs to the cobalt（II） complex.

关键词： artificial photosynthesis oxygen production quantum dots cobalt catalyst

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Pincer cobalt Complex as catalyst with Dual Hydrogenation Activities for Hydrodeoxygenation of Ketones with H2

引用

Chinese Journal of Chemistry 2023年第24期41卷 3528-3532页

作者： Bingxue Liu Qiang Liu Center of Basic Molecular Science (CBMS) Department of ChemistryTsinghua UniversityBeijing100084 China

Reductive deoxygenation of ketones using H_(2) is a highly desirable but also challenging transformation in both chemical synthesis,industrial-scale petroleum and biomass feedstock reforming ***,we report a cooperative cobalt/Lewis acid (LA)-catalyzed hydrodeoxygenation of ketones using H_(2) as the *** particular,the newly developed pincer cobalt catalyst possesses dual hydrogenation activities for both ketones and alkenes under the same reaction *** reaction features a broad substrate scope,excellent functional-group compatibility,and potential applicability.

关键词： cobalt catalyst Lewis acids Homogeneous catalysis Dual hydrogenation activities Hydrodeoxygenation Ketones

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

CARBON NANOTUBES VIA METHANE DECOMPOSITION ON AN ALUMINA SUPPORTED cobalt AEROGEL catalyst

引用

China Particuology 2003年第6期1卷 266-270页

作者： Lingyu Piao Jiuling Chen Yongdan Li Department of Catalysis Science and Technology School of Chemical EngineeringTianjin UniversityTianjin 300072P.R.China

An alumina-supported cobalt aerogel catalyst prepared from a sol-gel and a supercritical drying method was used in the catalytic decomposition of methane. The physical-chemical properties of the catalyst were characterized and its activity for methane decomposition was investigated. The effects of calcination and reaction temperatures on the activity of the catalyst and the morphology of the carbon nanotubes produced were discussed. A CoAl2O4 spinel structure formed in the calcined catalyst. The quantity of the nanotubes produced in the reaction increases with the amount of cobalt in the reduced catalyst. A higher reaction temperature leads to a higher reaction rate, though faster deactivation of the catalyst occurs with the change. The carbon nanotubes grown on the catalyst have smooth walls and uniform di-ameter distribution.

关键词： catalytic decomposition methane carbon nanotubes sol-gel aerogel cobalt catalyst morphology

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

Fischer-Tropsch synthesis by reduced graphene oxide nanosheets supported cobalt catalysts: role of support and metal nanoparticle size on catalyst activity and products selectivity

引用

Frontiers of Chemical Science and Engineering 2021年第2期15卷 299-309页

作者： Hasan Oliaei Torshizi Ali Nakhaei Pour Ali Mohammadi Yahya Zamani Seyed Mehdi Kamali Shahri Department of Chemistry Faculty of ScienceFerdowsi University of MashhadMashhad ***Iran Gas Research Division Research Institute of Petroleum IndustryTehran ***Iran Department of Chemical Engineering Pennsylvania State UniversityState CollegePA 16801USA

In this paper,a series of cobalt catalysts supported on reduced graphene oxide(rGO)nanosheets with the loading of 5,15 and 30 wt-%were provided by the impregnation *** activity of the prepared catalysts is evaluated in the Fischer-Tropsch synthesis(FTS).The prepared catalysts were carefully characterized by nitrogen adsorption-desorption,hydrogen chemisorption,X-ray diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,temperature programmed reduction,transmission electron microscopy,and field emission scanning electron microscopy techniques to confirm that cobalt particles were greatly dispersed on the rGO *** results showed that with increasing the cobalt loading on the rGO support,the carbon defects are increased and as a consequence,the reduction of cobalt is *** FTS activity results showed that the cobalt-time yield and turnover frequency passed from a maximum for catalyst with the Co0 average particle size of 15 nm due to the synergetic effect of cobalt reducibility and particle *** products selectivity results indicated that the methane selectivity decreases,whereas the C5+selectivity raises with the increasing of the cobalt particle size,which can be explained by chain propagation in the primary chain growth reactions.

关键词： cobalt catalyst cobalt particle size Fischer-Tropsch synthesis reduced graphene oxide supported catalyst

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

Kinetics and product distribution studies on ruthenium-promoted cobalt/alumina Fischer-Tropsch synthesis catalyst

引用

Journal of Natural Gas Chemistry 2010年第6期19卷 653-659页

作者： Ahmad Tavasoli Ali Nakhaei Pour Masoumeh Ghalbi Ahangari School of chemistry College of scienceUniversity of Tehran Research Institute of Petroleum Industry

Hydrocarbon production rates and distributions on ruthenium promoted alumina supported cobalt Fischer-Tropsch synthesis （FTS） catalyst were studied by the concept of two superimposed Anderson-Schulz-Flory （ASF） *** results indicated that the characterizing growth probabilities α1 and α2 were strongly dependent on reaction *** increasing the H2 /CO partial pressure ratios and reaction temperatures,deviation from normal ASF distribution decreases and the double-α-ASF distribution changes into a straight *** on the concept of double-α-ASF distribution,a useful rate equation for the production of hydrocarbons under industrial reaction conditions is obtained.

关键词： Fischer-Tropsch synthesis cobalt catalyst ruthenium reaction rate products distribution

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

Effect of catalyst confinement and pore size on Fischer-Tropsch synthesis over cobalt supported on carbon nanotubes

引用

Science China Chemistry 2012年第9期55卷 1811-1818页

作者： XIE Wei ZHANG YuHua LIEW KongYong LI JinLin Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education South-Central University for NationalitiesWuhan 430074China School of Chemistry and Chemical Engineering Soochow UniversitySuzhou 215123China Faculty of Industrial Science and Technology University Malaysia PahangKuantanMalaysia

This paper studies the impact of structure of cobalt catalysts supported on carbon nanotubes(CNT) on the activity and product selectivity of Fischer-Tropsch synthesis(FTS) *** types of CNT with average pore sizes of 5,11,and 17 nm were used as the *** catalysts were prepared by selectively impregnating cobalt nanoparticles either inside or outside *** TPR results indicated that the catalyst with Co particles inside CNT was easier to be reduced than those outside CNT,and the reducibility of cobalt oxide particles inside the CNT decreased with the cobalt oxide particle size *** activity of the catalyst with Co inside CNT was higher than that of catalysts with Co particles outside *** CNT pore size also appears to enhance the catalyst reduction and FTS activity due to the little interaction between cobalt oxide with carbon and the enhanced electron shift on the non-planar carbon tube surface.

关键词： carbon nanotube(CNT) cobalt catalyst confinement pore size Fiseher-Tropsch synthesis

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

cobalt catalysts supported on silica nanotubes for Fischer-Tropsch synthesis

引用

Science China Chemistry 2012年第1期55卷 145-150页

作者： TANG HuoQiang LIEW KongYong LI JinLin Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education South-Central University for NationalitiesWuhan 430074 China Faculty of Industrial Science and Technology Universiti Malaysia PahangKuantan 26300Malaysia

Silica nanotubes(SNT) have been synthesized using carbon nanotubes(CNT) as a ***-coated carbon nanotubes(SNT-CNT) and SNT were loaded with a cobalt catalyst for use in Fischer-Tropsch synthesis(FTS).The catalysts were prepared by incipient wetness impregnation and characterized by N2 physisorption,X-ray diffraction(XRD),hydrogen temperature programmed reduction(H2-TPR) and transmission electron microscopy(TEM).FTS performance was evaluated in a fixed-bed reactor at 493 K and 1.0 ***/CNT and Co/SNT catalysts showed higher activity than Co/SNT-CNT in FTS because of the smaller cobalt particle size,higher dispersion and stronger *** results also showed that structure of the support affects the product selectivity in *** synergistic effects of cobalt particle size,catalytic activity and diffusion limitations as a consequence of its small average pore size lead to medium selectivity to C5+ hydrocarbons and CH4 over Co/*** the other hand,the Co/CNT showed higher CH4 selectivity and lower C5+ selectivity than Co/SNT,due to its smaller average pore size and cobalt particle size.

关键词： Fischer-Tropsch synthesis cobalt catalyst activity selectivity silica nanotubes

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

Single-atom cobalt catalysts for chemoselective hydrogenation of nitroarenes to anilines

引用

Chinese Chemical Letters 2023年第12期34卷 183-188页

作者： Xiaochun Liu Chaoyue Wang Jiaolong Meng Xiaodong Yue Qingyun Wang Jiatian Lu Junke Wang Xicun Wang Yingxiao Zong Xuefeng Jjiang Gansu Key Laboratory of Polymer Materials College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China Key Laboratory of Hexi Corridor Resources Utilization of Gansu College of Chemistry and Chemical EngineeringHexi UniversityZhangye 734000China Shanghai Key Laboratory of Green Chemistry and Chemical Process Department of ChemistryEast China Normal UniversityShanghai 200062China School of Materials Design&Engineering Beijing Institute of Fashion TechnologyBeijing 100000China

Single-atomic catalysts(SACs)caught considerable attention due to their unique structural properties,complete exposed active site,and 100%atom utilization efficiency with remarkable catalytic *** single-atomic cobalt catalyst with Co-N_(4) active sites was synthesized by using nitrogen-doped graphene derived from ***-atomic cobalt was observed by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)in Co@***,the density functional theory(DFT)calculation and the extended X-ray absorption fine structures(EXAFS)fitting results indicate that the coordination structure of Co-N is *** this work,the practical hydrogenation of nitroarenes to anilines enabled by Co@Nx-C-800 was established with excellent yields and selectivity,which proved its advantages and potential applications.

关键词： cobalt catalyst Heterogeneous catalysis Nitro reduction Single-atom catalysts Chemoselective hydrogenation

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：