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高铁酸盐稳定性研究进展 总被引:6,自引:0,他引:6
高铁酸盐具有强氧化性和无毒性,是一种多用途化学试剂,可作为氧化剂、混凝剂、消毒剂和电池阴极材料使用.但高铁酸盐水溶液极易分解及固态高铁酸盐制备成本高,从而限制了它的实际应用.本文概述了高铁酸盐稳定性方面的研究进展,介绍了溶液浓度、pH、温度、高铁酸盐纯度和离子掺杂等因素对其稳定性的影响,以及改善高铁酸盐稳定性的各种研究... 相似文献
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高铁酸盐的电合成及其作为电极材料的电化学性质研究进展 总被引:2,自引:1,他引:2
综述了近几年来在高铁酸盐电合成及其作为电池材料的电化学性质研究方面的进展,介绍了各类不同的铁阳极在碱性电解质溶液中电解氧化为高铁酸盐的电流效率,并对在直流电上叠加正弦式交流电的电化学过程进行了讨论。高铁酸盐作为电池的阴极材料能形成高性能的超级铁电池。参考文献32篇。 相似文献
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高铁酸盐的量气分析法 总被引:4,自引:0,他引:4
1引言高铁酸盐经典的铬盐法测定是在高碱度下进行,遇酸必将失败。作者利用高铁酸盐的酸不稳定性,测定它和非还原性稀酸反应的放氧量,来完成对它的分析。样品中高铁酸盐含量α的计算公式:式中:P与P’分别为试验环境的大气压(Pa)和温度T时水的饱和蒸气压(Pa);T为反应体系的平衡温度,V为W(g)样品参与反应放氧体积(m3)以为高铁酸盐相对分子质量(g)。2实验部分2.1试剂与装置H2SO4:2.0mol/L水溶液;HNO3:2.0mol/L水溶液;镁条:纯度>99%;样品K2FeO4、BaFeO4·H… 相似文献
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绿色合成氧化剂高铁酸盐 总被引:13,自引:0,他引:13
高铁酸盐是绿色、无污染、高选择性和高活性的强氧化剂,其氧化性能比KMn04、O3和Cl还强,可以氧化醇类、含氮化合物、甚至烃类等有机化合物,高铁酸盐在有机物氧化合成中的应用具有很好的发展前景。本文介绍了有关高铁酸盐的制备方法、性质及有机物氧化合成方面的研究进展。 相似文献
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EDTA滴定法测定FeO42- 总被引:1,自引:0,他引:1
利用了FeO42-在酸性条件下的有关反应,以磺基水杨酸为指示剂,建立了用EDTA间接滴定FeO42-的新方法。用于高铁酸盐的制备和使用过程中测定,测定结果与邻菲口罗啉法一致。 相似文献
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Preparation of CS-CMC Bipolar Membrane and its Application in Electro-generated FeO4^2- 总被引:3,自引:0,他引:3
Yu Xi REN Zhen CHEN Ri Yao CHEN Xi ZHEN Ya Ming GENG 《中国化学快报》2006,17(11):1527-1530
CS-CMC bipolar membrane was prepared and the cross-section photograph of CS-CMC BM was observed by SEM. FT-IR spectrum indicated that CS-CMC BM contained -N=CRH2 and -COO- functional groups. The charge density of -N=CRH2 in CS membrane was about 14.13 mmol/g and the charge density of -COO- in CMC membrane was about 9.01 mmol/g. The electrochemistry properties of CS-CMC BM were also studied. CS-CMC BM not only can effectively stop FeO4 from diffusing into the cathode chamber, but also plays an important role in the supply of OH- consumed during the electro-generated FeO42- process. 相似文献
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Through a variety of highly correlated methods combined with large basis sets we have studied the electronic structure of FeO, FeO(+), and FeO(-). In particular, we have constructed complete potential energy curves for 48, 24, and 4 states for the FeO, FeO(+), and FeO(-) species, respectively, at the multireference level of theory. For all states examined we report energetics, common spectroscopic parameters, and dipole moments. Overall our results are in good agreement with experiment, but we have encountered as well interesting differences between experiment and theory deserving further investigation. 相似文献
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研究了影响Fe(OH)3进行酸式电离反应的因素,在多种浓度和温度条件下的NaOH浓溶液中采用SnO2-Sb2O3/Ti电极,研究FeO4^2-/FeO2^-体系的电化学氧化还原反应参数及其变化趋势,结果证实该体系发生电化学氧化还原反应的最佳碱溶液浓度范围为12—14mol/L,最佳温度范围为295~315K.阐明了在实验条件下FeO4^2-/FeO2^-氧化还原体系中存在由FeO4^2-/FeO2^-构成的氧化还原电对,而FeO2不直接与FeO2构成氧化还原电对;并给出了FeO4^2-/FeO2^-氧化还原体系的Latimer图. 相似文献
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以柠檬酸-硝酸盐自蔓延燃烧法合成了ABO3型钙钛矿结构的Pr0.6-xNdxSr0.4FeO3-δ(x=0.0~0.6)系列稀土复合氧化物粉体。利用傅立叶变换红外光谱(FTIR)和激光共焦拉曼光谱(LRS)对产物的晶体结构进行了表征。分别采用热膨胀仪测定烧结陶瓷体的热膨胀系数(TEC);TG-DTA记录材料的热稳定性;XRD研究阴极材料与中温电解质Sm0.2Ce0.8O1.9(SDC)及La0.8Sr0.2Ga0.8Mg0.2O3-δ(LSGM)的化学相容性;SEM观察阴极/电解质复合材料的断口形貌。结果表明,该系列样品在高、低温热循环过程中化学稳定、晶型稳定;在室温至1 100 ℃范围内的平均热膨胀系数为1.16 × 10-5 K-1,与SDC及LSGM的热膨胀系数十分接近。阴极/电解质混合粉体1 200 ℃煅烧10 h,XRD未检测到新物质;SEM显示复合层断面界面清晰,没有相互扩散现象。该体系有望成为以SDC或LSGM为电解质的中温固体氧化物燃料电池合适的阴极材料。 相似文献
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D.L. Hildenbrand 《Chemical physics letters》1975,34(2):352-354
The gaseous oxides FeO and FeO2 were identified by mass spectrometry as components of the effusion beam from a cell containing, initially, solid Fe2O3. From studies of gaseous equilibria involving these species, the dissociation energiesD00(FeO) = 96.8 ± 3 kcal (4.20 ± 0.13 eV) andD00(FeO2) = 199.0 ± 5 kcal (8.64 ± 0.22 eV) were derived. The ionization potential of FeO was found to be 8.71 ± 0.10 eV, leading toD00(Fe+-O) = 78.2 ± 4.6 kcal (3.39 ± 0.20 eV). 相似文献
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The optimized geometries, frequencies, and total electronic energies of two all-metal dianionic clusters Ga42- , In42- are calculated at the B3LYP, B3PW91, and MP2 levels of theory. There are two stable structures for each Ga42- , In42- species. For Ga42- , In42- species the square isomers are the most stable. On the basis of these computed stable structures we focus on two magnetic properties: magnetic susceptibility anisotropy and nucleus-independent chemical shift (NICS) for the square planar Ga42- , In42- isomers, which are calculated with B3LYP and HF methods. The computed results of NICS show that the square planar Ga42- , In42- isomers possess strong aromaticity. The detailed molecular orbital analysis for the two isomers further reveals that the two square planar Ga42- , In42- isomers have multiple-fold aromaticity: one delocalized π MOs and two delocalized σ MOs, which play important role in explaining the special stability of these all-metal square clusters. 相似文献