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硝酸氧化

硝酸氧化的相关文献在1983年到2022年内共计164篇,主要集中在化学工业、化学、矿业工程 等领域,其中期刊论文79篇、会议论文10篇、专利文献276516篇;相关期刊67种,包括中学化学、功能材料、黄金科学技术等; 相关会议10种,包括第十届全国新型炭材料学术研讨会、中国塑料加工工业协会2009年塑料助剂生产与应用技术信息交流会、全国水体污染控制、生态修复技术与水环境保护的生态补偿建设交流研讨会等;硝酸氧化的相关文献由420位作者贡献,包括杨炎、谢强、张丽珠等。

硝酸氧化—发文量

期刊论文>

论文:79 占比:0.03%

会议论文>

论文:10 占比:0.00%

专利文献>

论文:276516 占比:99.97%

总计:276605篇

硝酸氧化—发文趋势图

硝酸氧化

-研究学者

  • 杨炎
  • 谢强
  • 张丽珠
  • 王勋业
  • 谷长安
  • 陈玉明
  • 吴义芳
  • 吴元飞
  • 吴明铂
  • 周拥军
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 何天启; 王振; 王文春; 张康伟; 冉奋
    • 摘要: 以杏胡壳为原料,依次采用高温炭化和表面氧化改性的方法制备活性炭电极材料;采用扫描电子显微镜(SEM)表征材料的形貌;室温下,在三电极电化学体系,以2 mol/L的KOH溶液作为电解液,通过循环伏安、恒流充放电、电化学交流阻抗和循环稳定测试分析炭电极材料的电化学性能.研究结果表明:经硝酸氧化改性后的杏胡壳活性炭的综合电化学性能得到了显著提高,在0.5 A/g电流密度下,杏胡壳活性炭质量比电容达到196 F/g.在2 A/g的电流密度下充放电循环2500次后,电容保持率达到99%,展现出优异的电化学性能.%This paper used apricot shell as precursor to prepare active carbon electrode material by means of high temperature carbonization and surface oxidation modification. Scanning electron microscopy was used to characterize the morphology; three electrode electrochemical system with 2 mol/L KOH solution was used as electrolyte to test the electrochemical performance of materials, including cyclic voltammograms, constant current charging and discharging, electrochemical impedance, and cycle stability test and analysis. The results show that the modified carbon with nitric acid oxidation shows enhanced electrochemical performance. The specific capacitance of 196 F/g is obtained at the current density of 0.5 A/g. After cycling for 2 500 times at the current density of 2 A/g, the capacitance retention rate still remain 99% of the initial value, showing excellent electrochemical performance stability.
    • 侯彩霞; 孔碧华; 樊丽华; 郭秉霖; 许立军
    • 摘要: 以褐煤基无灰煤为原料,采用KOH 活化法制备多孔炭材料(PC),通过不同浓度 HNO3对多孔炭进行氧化改性,利用N2等温吸附、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)等方法对多孔炭进行表征,结合恒流充放电(GC)、循环伏安(CV)和交流阻抗的测试结果,考察浓度对多孔炭孔结构、表面性质以及电化学性能的影响.研究表明,随着 HNO3浓度的增加,多孔炭的比表面积逐渐降低,润湿性提高;用1% HNO3改性的多孔炭N-5、C—O 及 O—C =O 含量增加明显,在50 mA/g 的电流密度下,比电容可达273 F/g,相比未改性的多孔炭,比电容量增长了22.4%;在5000 mA/g的电流密度下,比电容保持率能达到80.4%,且在1000次循环后,比电容仍具有95.2%的保持率,具有良好的电化学性能.%Hyper coal (HPC)was used to prepare porous carbon(PC)by KOH activation method.Then the PC was modified by different concentrations of HNO3.N2adsorption instrument,scanning electron microscopy (SEM)and X-ray photoelectron spectroscopy(XPS)were used to characterize the pore structure.Galvanostatic charge/discharge(GC),cyclic voltammetry (CV)and electrochemical impedance spectroscopic analyses were used to test the electrochemical properties of PC.The results show that BET surface area of porous carbon de-crease and wettability improved with the increase of HNO3 concentration.The contents of N-5,C—O and O—C =O increase significantly when the PC was modified by 1% HNO3.Specific capacitance of PC is 273 F/g at a current density of 50 mA/g with the concentrations of 1%,which is 22.4% higher than that of the unmodified PC.It still maintains 80.4% at a current density of 5 000 mA/g.Even after 1 000 cycles,it is clear that the spe-cific capacitance still remains at about 9 5.4%,demonstrating good electrochemical performance.
    • 卜路霞; 王春杰; 尹立辉; 刘会翠
    • 摘要: Multi-walled carbon nanotubes (MWNTs) were modified by the nitric acid oxidation method and the structural characteristics of MWNTs were analyzed by IR and TG.The dispersion of MWNTs in water was also studied.The results showed that there were some carboxyl groups on the side walls of MWNTs after nitric acid oxidation,and the content of carboxyl groups was affected by the concentration of nitric acid,oxidizing temperature and time.The modified MWNTs had higher dispersibility and stability in water.%采用硝酸氧化法对多壁碳纳米管(MWNTs)进行了表面修饰,通过红外光谱和热重分析等测试手段对其结构特性进行了分析,并对多壁碳纳米管在水中的分散性进行了研究.结果表明,采用硝酸氧化法在多壁碳纳米管的侧壁成功引入了羧基官能团,羧基含量受硝酸浓度、氧化温度和时间的影响.表面修饰后的多壁碳纳米管在水中的分散性和稳定性明显提高.
    • 段文蕊; 王麦见; 陈天天; 张晓阁; 韩娟
    • 摘要: 针对环氧环己烷生产废液中25%浓度的1,2-环己二醇合成己二酸工艺进行研究.以铜和钒为催化剂,己二酸为目标产物,采用硝酸直接氧化法制备己二酸,探讨了催化剂用量、硝酸浓度、废液加量、反应温度、反应时间等影响因素,得到废液无需处理、直接催化氧化生产己二酸的最佳工艺参数,经工业化应用表明,该工艺技术可有效利用环氧环己烷生产废液中的1,2-环己二醇,收率达到80%以上,减少了环境污染,经济和社会效益显著.
    • 摘要: 1)性质。白色无定形结晶粉末,熔融后呈玻璃状。800-1000°C时分子结构为As6O(11)(As4O6·As2O5)。对热不稳定,在400°C以上时分解。易溶于水和乙醇,在冷水中徐徐分解,在热水中急骤分解。不溶于液体SO3中。常压遇氢时被还原成As2O3,最终还原成元素砷。也能被碱、硫及碳还原。遇铅、锌及碱金属被还原为砷或形成金属砷化物。在蒸汽中完全分解为氧气和三氧化二砷,可使HCl氧化分解为氯气。与液氨接触形成白色产物As2O5·3NH3。
    • 王月明; 宋玉苏; 申振
    • 摘要: The carbon fiber field electric field detection electrode was prepared by concentrated nitric acid oxida-tion method.The underwater electric field response performance of prepared electrodes was characterized through an underwater electric field generating device.The results show that the carbon fiber electrode treated by concentrated nitric acid can accurately respond to the electric field signal of 1 mHz-10 Hz compared with the untreated carbon fiber electrode,and the linearity has improved nearly by 98%.The electrode under oxidation in concentrated nitric acid for 2 h has the best response performance in the view of both linearity and sensitivity.%通过浓硝酸氧化法制备了碳纤维海洋电场探测电极,利用水下电场发生装置,对制备的碳纤维电极的水下电场响应性能进行表征.结果表明,相比于未处理的碳纤维电极,经过浓硝酸氧化处理的碳纤维电极能够准确响应1 mHz~10 Hz频率范围内的水下电场信号,线性度提高了近98%.从线性度与灵敏度综合考虑,浓硝酸氧化2h制备的碳纤维电极水下电场响应性能最佳.
    • 王月明; 宋玉苏; 申振
    • 摘要: The carbon fibers were subjected to concentrated nitric acid oxidation treatment and electrodes applied in marine electric field detection were prepared.The differences of the carbon fiber electrodes under different preparation conditions were stu-died by means of SEM,FTIR and TGA,the electrochemical properties such as potential stability,linear polarization property,elec-trochemical impedance performance and self-noise were characterized and evaluated and the optimized process conditions were deter-mined.The results indicates that the carbon fiber electrodes prepared by oxidation 4 hours at 110 °C has the best electrochemical per-formance.%通过浓硝酸氧化法制备了碳纤维海洋电场探测电极,借助 SEM、FTIR和TGA研究比较了不同氧化时间对碳纤维电极的影响,对极差稳定性、线性极化性能、电化学交流阻抗性能以及自噪声性能进行了表征与评估,确定优化的工艺条件.结果表明,在110 °C的条件下,氧化4 h制备的碳纤维电极的电化学性能最佳.
    • 董建勋; 郭卫东; 王素静; 张明; 齐建华
    • 摘要: In order to study the generation mechanism of trace phenol during nitric acid oxidation of cyclohexanol into adipic acid and the effect of trace phenol on adipic acid,the reaction solution of nitric acid oxidation of cyclohexanol into adipic acid was treated by neutralization extraction and the extraction solution was analyzed by gas chromatograph-mass spectrometry when adipic acid at different production stages was treated and analyzed by the same method.The results showed that trace adipic acid was detected in the reaction solution of cyclohexanol oxidation and the crude product of adipic acid at different production stages;the generation mechanism of trace phenol was the local high-temperature dehydrogenation of cyclohexanol reaction system in presence of catalysts;trace phenol was easy to be oxidized into benzoquinone or other azo compounds in air,resulting in the relatively high chroma of adipic acid and the comparably high UV value of nylon 66 salt.%为了探究硝酸氧化环己醇合成己二酸过程中生成微量苯酚的机理及其对己二酸的影响,采用中和萃取的方法处理硝酸氧化环己醇合成己二酸的反应液,并利用气相色谱-质谱(GC-MS)分析萃取液,同时采用同样的处理方法和分析方法对己二酸不同工段的产品进行了处理分析.结果表明:环己醇氧化反应液和不同生产工段的己二酸产品中均检测出了微量苯酚;微量苯酚的生成机理是环己醇在催化剂作用下,于反应体系局部高温区域脱氢而成;微量苯酚易被空气氧化生成苯醌或者其他偶氮化合物最终导致己二酸色度偏高,引起尼龙66盐UV值偏高.
    • 罗悦
    • 摘要: 分别运用化学衍生法与X光电子能谱(XPS)分析了硝酸氧化前、后的碳纤堆表面所发生的化学变化.结果表明,高模量碳纤维表面化学基团含量要明显低于低模量碳纤维的含量;硝酸氧化对于低模量碳纤维表面改性显著大于高模量碳纤维;硝酸氧化使得碳纤维表面相应羟基含量得以减少,而碳纤维表面羟基含量却有所增加.
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