检索结果-南通市图书馆

molten salts-modified MgO-based adsorbents for intermediate-temperature CO_2 capture: A review

Journal of Energy Chemistry 2017年第5期26卷 830-838页

作者： Wanlin Gao Tuantuan Zhou Yanshan Gao Benoit Louis Dermot O'Hare Qiang Wang College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Laboratoire de Synthese Reactivite Organiques et Catalyse Institut de Chimie UMR 7177 Universite de Strasbourg1 rue Blaise Pascal 67000 StrasbourgFrance Chemistry Research Laboratory Department of Chemistry University of Oxford Mansﬁeld Road Oxford OX1 3TA United Kingdom

Carbon dioxide（CO2） capture using magnesium oxide（MgO）-based adsorbents at intermediate temperatures has been regarded as a very prospective technology for their relatively high adsorption capacity,low cost, and wide availability. During the past few years, great effort has been devoted to the fabrication of molten salts-modified MgO-based adsorbents. The extraordinary progress achieved by coating with molten salts greatly promotes the COcapture capacity of MgO-based adsorbents. Therefore, we feel it necessary to deliver a timely review on this type of COcapturing materials, which will benefit the researchers working in both academic and industrial areas. In this work, we classified the molten saltsmodified MgO adsorbents into four categories:（1） homogenous molten salt-modified MgO adsorbents,（2） molten salt-modified double salts-based MgO adsorbents,（3） mixed molten salts-modified MgO adsorbents, and（4） molten salts-modified MgO-based mixed oxides adsorbents. This contribution critically reviews the recent developments in the synthetic method, adsorption capacity, reaction kinetics, promotion mechanism, operational conditions and regenerability of the molten salts-modified MgO COadsorbents. The challenges and prospects in this promising field of molten salts-modified MgO COadsorbents in real applications are also briefly mentioned.

关键词： Global warming Magnesium oxide CO2 adsorption molten salts Intermediate temperatures

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

Effects of additive NaI on electrodeposition of Al coatings in AlCl_(3)-NaCl-KCl molten salts

引用

Frontiers of Chemical Science and Engineering 2021年第1期15卷 138-147页

作者： Tianyu Yao Haiyan Yang Kui Wang Haiyan Jiang Xiao-Bo Chen Hezhou Liu Qudong Wang Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China The State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China School of Engineering RMIT UniversityMelbourneVIC 3000Australia

Effects of NaI as an additive on electrodeposition of Al coatings in AlCl_(3)-NaCl-KCl(80-10-10 wt-%)molten salts electrolyte at 150°C were investigated by means of cyclic voltammetry,chronopotentiometry,scanning electron microscopy and X-ray diffraction(XRD).Results reveal that addition of NaI in the electrolyte intensifies cathodic polarization,inhibits growth of Al deposits and increases number density of charged particles.The electrodeposition of Al coatings in the AlCl_(3)-NaCl-KCl molten salts electrolyte proceeds via three-dimensional instantaneous nucleation which however exhibits irrelevance with NaI.Galvanostatic deposition results indicate that NaI could facilitate the formation of uniform Al deposits.A compact coating consisting of Al deposits with an average particle size of 3μm was obtained at a current density of 50 mA∙cm^(−2) in AlCl_(3)-NaCl-KCl molten salts electrolyte with 10 wt-%NaI.XRD analysis confirmed that NaI could contribute to the formation of Al coating with a preferred crystallographic orientation along(220)plane.

关键词： NaI additive electrodeposition molten salts Al coating

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

Electrochemistry of Hf(Ⅳ)in NaCl-KCl-Na-K_(2)HfF_(6) molten salts

引用

International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1644-1649页

作者： Yan-ke Wu Guo-qing Yan Song Chen Li-jun Wang GRINM Resources and Environment Tech.Co. LtdBeijing 101407China

The cathodic reduction mechanism of Hf(Ⅳ)ions in a fused Na Cl–KCl–Na F–K_(2) HfF_(6) salt system was studied in various Na F concentrations at 1073 K to obtain a purified dendritic Hf metal.The results of cyclic voltammetry and square wave voltammetry indicated that the reduction process comprised two steps of Hf(Ⅳ)→Hf(Ⅱ)and Hf(Ⅱ)→Hf at low Na F concentrations(0molten salt electrorefining.

关键词： electrochemical behavior cyclic voltammetry potentiostatic electrolysis dendritic hafnium molten salts

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

Progress in preparation of rare earth metals and alloys by electrodeposition in molten salts

引用

Rare Metals 2016年第11期35卷 811-825页

作者： Wei Han Mei Li Mi-Lin Zhang Yong-De Yan Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering University

Rare earth（RE） metals and their alloys have attracted considerable practical interests due to their functional properties. Because of their negative deposition potentials, RE metals cannot be electrochemically deposited from aqueous media. Using molten salt as medium provides a unique opportunity for the electrowinning and electrorefining of high-purity RE metals, as well as for the electrochemical formation of their alloys and intermetallic compounds. Certainly, the electrochemical behaviors of RE metals and their alloys have been investigated in a number of different molten salts comprising all-fiuorides,all-chlorides and mixed chloride-fiuoride media. Based on the results, RE and their alloys were produced by molten salt electrolysis. In this paper, the developments of preparation of RE metals and their alloys by electrolysis in molten salts in recent years were systematically summarized on both the local and international levels. Attention was paid mainly to the electrodeposition of RE metals and their alloys, including RE-Mg, RE-Al, RE-Ni, RE-Co,RE-Cu, RE-Fe and RE-Zn alloys.

关键词： Electrochemical formation molten salts Electrolysis Rare earth Alloys

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

Interactions of molten salts with cathode products in the FFC Cambridge Process

引用

International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1572-1587页

作者： George Z.Chen Department of Chemical and Environmental Engineering Faculty of EngineeringUniversity of NottinghamNottingham NG72RDUK Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100China

molten salts play multiple important roles in the electrolysis of solid metal compounds,particularly oxides and sulfides,for the extraction of metals or alloys.Some of these roles are positive in assisting the extraction of metals,such as dissolving the oxide or sulfide anions,and transporting them to the anode for discharging,and offering the high temperature to lower the kinetic barrier to break the metal-oxygen or metal-sulfur bond.However,molten salts also have unfavorable effects,including electronic conductivity and significant capability of dissolving oxygen and carbon dioxide gases.In addition,although molten salts are relatively simple in terms of composition,physical properties,and decomposition reactions at inert electrodes,in comparison with aqueous electrolytes,the high temperatures of molten salts may promote unwanted electrode-electrolyte interactions.This article reviews briefly and selectively the research and development of the F ray-F arthing-Chen(FFC)Cambridge Process in the past two decades,focusing on observations,understanding,and solutions of various interactions between molten salts and cathodes at different reduction states,including perovskitization,non-wetting of molten salts on pure metals,carbon contamination of products,formation of oxychlorides and calcium intermetallic compounds,and oxygen transfer from the air to the cathode product mediated by oxide anions in the molten salt.

关键词： FFC Cambridge Process molten salts electrolysis extraction oxides sulfides metals alloys reaction mechanisms

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

Solubility of RE_2O_3(RE=La and Nd) in light rare earth fluoride molten salts

引用

Journal of Rare Earths 2018年第7期36卷 765-771页

作者： Xiaoping Zhu Shuchen Sun Chuan Liu Ganfeng Tu School of Metallurgy Northeastern University

The chemical reaction and dissolution processes of RE2 O3 in REF3-LiF（RE = La and Nd） molten salts were studied by X-ray diffraction, differential thermal analysis and chemical analysis. Firstly, RE2 O3 disperses in molten salts and reacts with REF3 and LiF, which lead to the generation of a new phase REOF, resulting in the dissociation or formation of complex ions by part of REOF, and the sedimentation of excessive REOF at the bottom. The RE contents in molten salts were used to determine the solubility of RE2 O3. The results show that with 20 mol%-40 mol% of REF3, the solubility ranges from 1.79 to 3.05 g RE2 O3 per100 g electrolyte and the corresponding mole concentration is 0.33%-0.87%. RE2 O3 solubility increases with increasing temperature and REF3 concentration. The natural logarithm of the RE2 O3 solubility is plotted against 1/T and can be interpreted by linear relationship. The fitting parameters can be used to estimate the solubility of RE2 O3 with minimized experimental efforts and difficult experiment conditions.

关键词： REF3-LiF RE2O3 Rare earth molten salts Solubility Electrolyte

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

Controllable nitridation of Ta_(2)_(O5) in molten salts for enhanced photocatalysis

引用

International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1703-1710页

作者： Jing Zhou Dan-dan Nie Xian-bo Jin Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Eletrochermical Power SourexWuhan Lniversitwuhan 430072China Sschool of Resouwce and Einvironmental Sciences Hubei lnternational Scientifie and Teehnological Cooperation Base of Sustainable Rexource and EnergyWuhan UniversityWuhan 430072China

Pyrolysis of the Ta_(2)_(O5)/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta_(2)_(O5).The influence of the stoichiometry and composition of Ta_(2)_(O5)/melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta_(3)N_(5) and Ta_(3)N_(5)/TaON.The characterization results,including scanning electron microscopy,transmission electron microscopy,elemental mapping,X-ray photoelectron spectroscopy,and photoluminescence spectroscopy,all confirm the existence of the Ta_(3)N_(5)/TaON heterojunction,in which the TaON nanoparticles are closely anchored to the Ta_(3)N_(5) nanorods.Benefiting from its composition and structure,the Ta_(3)N_(5)/TaON composites show enhanced photocatalytic activity for the degradation of methylene blue.The present study highlights that the molten salt method using a solid nitrogen source can be a new technique for rationalizing the design of nitrides and oxynitrides.

关键词： molten salts photocatalysis Ta_(3)N_(5) TaON heterojunction

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

Electrical conductivity of REF3-LiF(RE=La and Nd) molten salts

引用

Journal of Rare Earths 2020年第6期38卷 676-682页

作者： Xiaoping Zhu Shuchen Sun Ting Sun Chuan Liu Ganfeng Tu Jiayue Zhang School of Metallurgy Northeastern UniversityShenyang 110819.China School of Sciences Northeastern UniversityShenyang 110819China Shenyang Research Institute of Chemical Industry Shenyang 110021China

The electrical conductivity of REF3-LiF(RE=La and Nd) molten salts(xREF3=5 mol%-40 mol%) was systematically measured over the temperature range from 1223 to 1423 K by using continuously varying cell constant(CVCC) method.Electrical conductivity values of LaF3-LiF and NdF3-LiF molten salts within the studied ranges are 4.11-9.39 and 3.62-9.51 S/cm,respectively.The composition and temperature dependences of electrical conductivity and the factor of RE2 O3 on electrical conductivity were investigated.The electrical conductivity nonlinearly decreases with the increasing mole percent of REF3 for the changing of structural ion in molten salts.A good linear relationship between the natural logarithm of electrical conductivity(lnκ) and the reciprocal of the absolute temperature(T-1) can be interpreted by the trend that electrical conductivity linearly increases with increasing temperature.Although it is an important factor of RE2 O3 on electrical conductivity,the influence of RE2 O3 on conductivity is small for the very limited solubility of RE2 O3 in REF3-LiF molten salts.The results of this work supplement the present electrical conductivity data of rare earth fluoride electrolyte.

关键词： Electrical conductivity Rare earth REF3-LiF molten salts Electrolyte

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

Hot-corrosion behavior associated with the evolution of corrosion scales of a Ni-based superalloy in molten salts

引用

Progress in Natural Science:Materials International 2021年第3期31卷 486-492页

作者： Ruifeng Dong Dong Liu Tiebang Zhang Ling Yang Li Wu Yuhong Zhao Hua Hou School of Materials Science and Engineering North University of China State Key Laboratory of Solidification Processing Northwestern Polytechnical University School of Science of NUC North University of China

The degradation of Ni-based superalloys in molten salts is closely related with the evolution of corrosion scales. In this work, the evolution of corrosion scales, the characteristics of the scale/alloy matrix interface associated with the corrosion mechanisms and the corrosion kinetics of a Ni-based superalloy Ni–20 Cr–18 W in molten salts were investigated. The outer surface of the corrosion scales was composed of numerous flakes. From the cross-sectional view, the scales gradually presented a layered structure and its formation can be ascribed to the morphology evolution of the inclusions inserted within the scales. It was found that the corrosion progress was a cooperative process involving in both oxidation and sulfuration, and the element of sulfur(S) took the precedence to penetrate into the matrix and resulted in an obvious sulfuration zone nearby the scales/alloy matrix interface. The corrosion activation energy of the investigated alloy was calculated to be 125.27 k J/mol. This work is expected to work out the structural evolution of the corrosion scales and the characteristics of the scale/matrix interface associated with the corrosion mechanisms for Ni-based superalloys.

关键词： Ni-based superalloys Hot corrosion molten salts Corrosion scales Scales/matrix interface Corrosion 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

Study on electrochemical preparation of Al-Li-Y alloys from Y_2O_3 in LiCl-KCl-AlCl_3 molten salts

引用

Journal of Rare Earths 2011年第4期29卷 378-382页

作者：黎亚明王凤丽张密林韩伟田阳 Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

The electrochemical preparaton of Al-Li-Y alloys from LiCl-KCl-AlCl3-Y2O3 system was studied. The chlorination of Y2O3 by AlCl3 led to the formation of Y （III） ions in the molten salts. Cyclic voltammogram （CV） showed that the underpotential deposition （UPD） of yttrium on pre-deposited aluminum caused the formation of Al-Y alloy. Al-Li-Y alloys with different yttrium contents were obtained by galvanostatic electrolysis and analysed by SEM-EDS and ICP. The ICP results showed that the lithium and yttrium contents in Al-Li-Y alloys depended on the addition of AlCl3 into the melts.

关键词： Al-Li-Y alloys molten salts electrochemical deposition rare earth oxides

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：