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首页> 外文学位 >I. Environmental abatement of air pollutants and greenhouse gases by photocatalytic oxidation and discharge plasmas. II. Preparation and characterization of binary mesoporous oxides.
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I. Environmental abatement of air pollutants and greenhouse gases by photocatalytic oxidation and discharge plasmas. II. Preparation and characterization of binary mesoporous oxides.

机译：I.通过光催化氧化和放电等离子体消除空气污染物和温室气体的环境。二。二元介孔氧化物的制备和表征。

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摘要

This research contains two major parts. The first part involves abatement of small environmentally unfriendly molecules such as triethylamine, carbon tetrafluoride, and carbon dioxide by photocatalytic oxidation, and alternating current (AC) discharge plasmas respectively. The second part involves synthesis and characterization of some binary mesoporous oxides.; The rate of triethylamine oxidation was found to be dependent on water vapor pressure, UV intensity, and concentration of TEA. Several reaction intermediates or partial oxidation products were observed to adsorb on the catalyst surface and deactivate the catalyst by blocking the adsorption of TEA on the surface and/or by poisoning active sites for TEA degradation.; The concentrations of CF4 and H2O, the type of the reactors, the characteristics of the plasmas, and input voltage all played important roles in the destruction of CF4. Combined glow discharge and arc plasmas showed a synergetic effect on the destruction of CF4 . In glow discharge plasmas, N2 was activated to N2 * and N2+, which transferred energy to CF 4 and H2O to form CO2 and HF. In arc plasmas, in addition to the activation of N2 to N2* and N 2+, CF4 was also activated and formed excited CF and CF2 species, which reacted with activated N2 species to form products and other intermediates such as CN.; The process of glow discharge plasmas with and without arc formation using a Y-type reactor is effective in CO2 reforming CH4 into CO and H2. The reaction products included CO, H2, as well as a small amount of hydrocarbons. Reactions with the formation of arcs produced more CO as well as higher energy efficiencies than those without arc formation.; Thermally stable mesoporous germanium manganese oxide materials have been synthesized. The materials have an amorphous wall structure, disordered mesopores, and high surface areas. Increasing synthetic temperature increased pore volume and mean pore size, and contributed to the broadening of the pore size distribution. Extending the same approach to nickel germanium oxide system produces a high surface area material with mostly micropores. The nickel tin oxide material prepared by this approach yields a material with much larger and less defined pores similar to γ-Al2O3.
机译：这项研究包含两个主要部分。第一部分涉及通过光催化氧化和交流（AC）放电等离子体分别消除对环境不利的小分子，例如三乙胺，四氟化碳和二氧化碳。第二部分涉及一些二元介孔氧化物的合成和表征。发现三乙胺的氧化速率取决于水蒸气压力，紫外线强度和TEA浓度。观察到几种反应中间体或部分氧化产物吸附在催化剂表面上，并通过阻止TEA在表面上的吸附和/或通过毒化TEA降解的活性位而使催化剂失活。 CF 4 和H 2 O的浓度，反应器的类型，等离子体的特性以及输入电压都在破坏CF > 4 。辉光放电和电弧等离子体的结合对CF 4 的破坏具有协同作用。在辉光放电等离子体中，N 2 被激活为N 2 *和N 2 + ，将能量转移到CF 4 和H 2 O形成CO 2 和HF。在电弧等离子体中，除了将N 2 激活为N 2 *和N 2 + 外，CF 4 也被活化并形成激发的CF和CF 2 物种，它们与活化的N 2 物种反应形成产物和其他中间体，例如CN 。;使用Y型反应器在有电弧和无电弧的情况下进行辉光放电等离子体过程，对于将CO 2 重整CH 4 转化为CO和H 2 。反应产物包括CO，H 2 以及少量的烃。与没有形成电弧的反应相比，形成电弧的反应产生更多的一氧化碳以及更高的能量效率。已经合成了热稳定的介孔锗锰氧化物材料。该材料具有无定形的壁结构，无序的中孔和高表面积。合成温度的升高增加了孔体积和平均孔径，并有助于扩大孔径分布。将相同的方法扩展到镍锗氧化物系统，可以生产出具有大部分微孔的高表面积材料。通过这种方法制备的镍锡氧化物材料会产生具有更大和更不规则的孔的材料，类似于γ-Al 2 O 3 。

著录项

  • 作者

    Huang, Aimin.;

  • 作者单位

    The University of Connecticut.;

  • 授予单位 The University of Connecticut.;
  • 学科 Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无机化学;
  • 关键词

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