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ion-defect
相关语句
  相似匹配句对
     ION BEEN OXIDATION
     离子束氧化
短句来源
     BIOACCUMULATION OF CADMIUM ION
     镉离子的生物富集
短句来源
     ION-CHANNEL LASER
     离子通道激光
短句来源
     Development of Ion-sulphurizing
     离子渗硫技术进展
短句来源
     On Product Defect
     论产品缺陷
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Anodic aad cathodic behaviors of pure iron in the borate buffer solution ( pH 8.4) were studied by an application of transient techniques of a rotating disc-ring electrode The anodic process proceeds mainly at the surface on metal to produce surface oxides of iron which are responsible for anodic passivation.The kinetic equation for the change in the surface valence states,Fe2-(sur face)→Fe3+(suf face),in a linear potential sweep experiment,have been presented to interpret the second peak in an anodic voltammogram.The...

Anodic aad cathodic behaviors of pure iron in the borate buffer solution ( pH 8.4) were studied by an application of transient techniques of a rotating disc-ring electrode The anodic process proceeds mainly at the surface on metal to produce surface oxides of iron which are responsible for anodic passivation.The kinetic equation for the change in the surface valence states,Fe2-(sur face)→Fe3+(suf face),in a linear potential sweep experiment,have been presented to interpret the second peak in an anodic voltammogram.The passive film on iron includes both Fe2+ and Fe3+ ions over a certain steady passive region.The content of Fe3+ ions varies with anodic potential and it is possible that the passive film is consisted of Fe(Ⅲ) oxide unique-ly.High valence iron ions(or iron ion defects)present in the film on iron in a passive region of more anodic potentials.The cathodic reduction of the passive film on iron fundamentally involves three stages:the reduction of high valence iron ions,the change in the surface valence states,and the cathodic reduction of Fe2+ ions in a solution phase.Existing mechanisms for the anodic passivation of iron,and physical models for the passive film on iron in a near neutral solution were surveied briefly.

本文使用旋转盘一环电极的暂态技术——电位阶跃和线性电位扫描技术,研究纯铁在近中性溶液(pH8.4硼酸钠缓冲溶液)中的阳极行为及阴极过程。发现铁的阳极过程主要是生成表面氧化物,钝化是表面相氧化物形成的结果。在稳态钝化区电位范围,i—V图阳极支出现稳态极化曲线所没有的第二波,第二波的峰电流正比于电位扫描速度的一次方,推导出表面价态变化反应,Fe_(surfacc)~(2+)→Fe_(surface)~(3+)的动力学方程予以解释;且证明钝化膜的成分先是Fe~(2+)和Fe~(3+)离子共存,Fe~(3+)离子的含量随电位而变,在一定电位区中将可能只包含Fe~(3+)离子,在更正的电位,膜中出现高价的铁离子(或铁离子缺陷)。(钝化膜的还原主要包括三个阶段:高价铁离子的还原,表面价态变化,及溶液相中Fe~(2+)离子的阴极还原。文中对目前已提出的铁在近中性溶液中阳极钝化的机理和钝化膜的物理模型也作简要的评介。

The significance of the ion-defect mechanism in directing the development of catalystsfor selective oxidation of olefins has been demonstrated.The mechanism has been applied tothe research of sophisticated Mo-Bi-Fe multioxides catalysts.Application of the mechanismenables us to turn elements having no catalytic action and even harmful to the reaction toactive catalyst components.While the mechanism provides theoretical direction and range ofselection for improving catalysts and screening active components,...

The significance of the ion-defect mechanism in directing the development of catalystsfor selective oxidation of olefins has been demonstrated.The mechanism has been applied tothe research of sophisticated Mo-Bi-Fe multioxides catalysts.Application of the mechanismenables us to turn elements having no catalytic action and even harmful to the reaction toactive catalyst components.While the mechanism provides theoretical direction and range ofselection for improving catalysts and screening active components, its relationship withcatalyst activity is only applicable to catalysts compound of the same active components.Theaccuracy and insufficiency of the mechanism are demonstrated by successfully developedcatalysts。

介绍了离子空缺理论发展的简况,结合研究工作阐述了离子空缺理论对烯烃选择氧化催化剂研制的指导意义,并将这一理论用于研究复杂的Mo-Bi-Fe多元氧化物催化剂,简略介绍试验流程和试验方法,提出用离子空缺法可使某些对催化活往无作用,甚至有害的元素变为有活性的组份,离子空缺法对改进催化剂,选择新的活性组份提供了一定的理论指导和选择范围。同时指出,离子空缺值与催化剂活性的关系只对相同元素组成的催化剂才有效,不适用于不同化学组成的催化剂。以研究成功的催化剂为实例说明此理论的正确性和不足之处。

The La Cu Mn perovskite type mixed oxides were prepared by the Sol gel method using EDTA as complex agent,and characterized by X ray diffraction(XRD) and X ray photoelection spectroscopy(XPS).The XPS analysis reveals the characteristic changes resulting from the A site substitutions,B site substitutions or both substitutions of Cu in LaMnO 3.A site substitutions for La 3+ is more beneficial to enhance the content of manganese ion on the surface,the relative value of lattice oxygen and the concentration...

The La Cu Mn perovskite type mixed oxides were prepared by the Sol gel method using EDTA as complex agent,and characterized by X ray diffraction(XRD) and X ray photoelection spectroscopy(XPS).The XPS analysis reveals the characteristic changes resulting from the A site substitutions,B site substitutions or both substitutions of Cu in LaMnO 3.A site substitutions for La 3+ is more beneficial to enhance the content of manganese ion on the surface,the relative value of lattice oxygen and the concentration of ion defect than B site substitutions for Mn 3+ .But there is no marked difference in influence on Mn 4+ .

采用以 EDTA为配位剂的 Sol- gel法制备 L a- Cu- Mn体系钙钛矿型复合氧化物 ,借助 X射线衍射(XRD)、X射线光电子能谱 (XPS)等手段对其表面的结构和性质进行表征。结果表明 ,Cu2 +部分取代 A位、B位或同时部分取代 A位、B位将导致氧化物表面特征发生变化 ;部分取代 A位的 L a3+ 比部分取代 B位的 Mn3+ 更有利于锰离子在表面富集 ,更能提高晶格氧的相对含量和阳离子缺陷的浓度 ,但对 Mn3+含量的影响程度没有明显差异

 
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