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首页> 外文学位 >Removal of nitrogen oxides using nanosized catalysts prepared by dry mechanical coating technique.
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Removal of nitrogen oxides using nanosized catalysts prepared by dry mechanical coating technique.

机译：使用通过干式机械涂覆技术制备的纳米级催化剂去除氮氧化物。

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摘要

Nitrogen oxides (NOx) are air pollutants commonly emitted by mobile sources and are the major causes for acid rain and visibility degradation. NOx emissions are commonly controlled by using noble metal-based catalysts that are scarce and expensive. Hence, research focus has recently been diverted to less costly and equally effective alternatives to noble metals. One promising candidate is the group of transition metal oxides, in particular, CuO.; The overall objective of the research was to develop well-dispersed CuO nanosized catalysts and Al2O3 nanosized particles coated onto durable substrates for efficient NOx removal. Using a dry mechanical coating technique, products with a high surface area and good dispersion were successfully synthesized. The product surface area increased as nanoparticle loading increased although the coating efficiency declined at high loadings. The degree of dispersion and homogeneous distribution of Al2O 3 with CuO nanoparticles increased with the processing time. The crystalline phase of raw materials was preserved during the coating process. The coating retained its integrity over long hours of operation.; The products were subsequently assessed for their catalytic performance for NOx removal. The experimental results showed that the activity of the catalysts is strongly related to the loading amount and the dispersion degree of CuO nanoparticles. With the contribution of Al2O 3 nanoparticles, the binary coating system yielded a higher NO x removal efficiency (69%) than the coating system consisting of CuO alone (65%). To obtain optimal NOx removal activity, the optimal loading for CuO nanoparticles was found to be 5% with an optimal temperature of 500°C. The superior stability of the catalysts was demonstrated for a wide range of temperatures.; Environmental impacts associated with catalysts for NOx removal, including CuO and Pt (a main component of commercial automobile catalyst), were assessed by life cycle analysis. CuO nanosized catalysts yielded significantly lower emissions of air pollutants including CO2, NOx, SO2, and CH4, posing less potential for acid rain formation and global warming. However, CuO catalysts possessed a greater potential for carcinogen toxicity.; The findings of this research will advance knowledge in dry coating techniques and catalytic NOx removal from automobile exhaust using transition metal oxides for sustainability, a safer environment and enhanced quality of life.
机译：氮氧化物（NO x ）是移动源通常排放的空气污染物，是酸雨和能见度下降的主要原因。通常通过使用稀有且昂贵的贵金属基催化剂来控制NO x 的排放。因此，近来的研究重点已转移到成本更低且同样有效的贵金属替代品上。一种有希望的候选物是过渡金属氧化物，特别是CuO。研究的总体目标是开发分散在耐用基材上的分散良好的CuO纳米尺寸催化剂和Al 2 O 3 纳米尺寸颗粒，以实现有效的NO x 移除。使用干式机械涂覆技术，成功合成了具有高表面积和良好分散性的产品。产品表面积随着纳米颗粒载荷的增加而增加，尽管在高载荷下涂层效率下降。 Cu 2 O 3 与CuO纳米粒子的分散程度和均匀分布随着加工时间的增加而增加。原料的结晶相在涂覆过程中得以保留。涂层在长时间运行后仍保持其完整性。随后评估产物的去除NO x 的催化性能。实验结果表明，催化剂的活性与CuO纳米粒子的负载量和分散度密切相关。在Al 2 O 3 纳米颗粒的作用下，二元涂层系统产生的NO x 去除效率比涂层系统高（69％）。仅由CuO组成（65％）。为了获得最佳的NO x 去除活性，CuO纳米粒子的最佳负载量为5％，最佳温度为500°C。在广泛的温度范围内证明了催化剂的优异稳定性。通过生命周期分析评估了与去除NO x 的催化剂相关的环境影响，包括CuO和Pt（商用汽车催化剂的主要成分）。 CuO纳米催化剂可显着降低空气污染物的排放，包括CO 2 ，NO x ，SO 2 和CH 4 ，酸雨形成和全球变暖的潜力较小。但是，CuO催化剂具有更大的致癌物毒性潜力。这项研究的结果将促进在干涂层技术和使用过渡金属氧化物从汽车尾气中去除NO x 的催化作用方面的知识，以实现可持续性，更安全的环境和更高的生活质量。

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  • 作者

    Coowanitwong, Nowarat.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 156 p.
  • 总页数 156
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

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