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首页> 外文期刊>Environmental Science & Technology >Heterogeneous Oxidation Kinetics of Acetic Acid in Supercritical Water
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Heterogeneous Oxidation Kinetics of Acetic Acid in Supercritical Water

机译：乙酸在超临界水中的异相氧化动力学

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摘要

The potential catalytic effect by reactor surface has been noted in a number of studies of supercritical water oxidation (SCWO) of organic compounds. In the present study, acetic acid was tested to investigate the catalytic effect of the reactor surface on its SCWO kinetics. Batch experiments were carried out over the temperature range of 400-460℃ at a supercritical water (SCW) density of 0.25 g/mL. The acetic acid oxidation kinetics increased with the surface to volume ratio and was affected by the oxidation state of the reactor surface. A power law rate equation was determined as follows: r = 10~(9.8±0.7) exp[-(148.5 ± 9.4)/RT][CH_3COOH]~(1.23±0.03)[O_2]~(0.23±0.01). Also, the observed kinetics was consistent with a proposed heterogeneous rate model assuming a rate control by the surface reaction between adsorbed oxygen and unadsorbed acetic acid. The results of this study show that the destruction performance by SCWO may significantly vary depending upon the type and state of reactor material. Therefore, potential heterogeneous characteristics of any reaction of interest should be sufficiently taken into consideration to maintain the desired performance of the SCWO process.
机译：在有机化合物的超临界水氧化（SCWO）的许多研究中已注意到反应堆表面的潜在催化作用。在本研究中，测试了乙酸以研究反应器表面对其SCWO动力学的催化作用。在0.25 g / mL的超临界水（SCW）密度下，在400-460℃的温度范围内进行了批量实验。乙酸氧化动力学随表面体积比的增加而增加，并受反应器表面氧化态的影响。幂律速率方程确定如下：r = 10〜（9.8±0.7）exp [-（148.5±9.4）/ RT] [CH_3COOH]〜（1.23±0.03）[O_2]〜（0.23±0.01）。而且，观察到的动力学与提出的非均相速率模型一致，假定通过吸附的氧气和未吸附的乙酸之间的表面反应控制速率。这项研究的结果表明，SCWO的破坏性能可能会根据反应堆材料的类型和状态而显着变化。因此，应充分考虑任何感兴趣反应的潜在异质性，以维持SCWO工艺的所需性能。

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  • 来源
    《Environmental Science & Technology》 |1996年第12期|p.3487-3492|共6页
  • 作者

    DONG SOO LEE;

  • 作者单位

    Department of Environmental Planning, Graduate School of Environmental Studies, Seoul National University, Shinlimdong san 56-1, Kwanak Ku, Seoul 151-742, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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