...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Oxidation Mechanisms of CF_2Br_2 and CH_2Br_2 Induced by Air Nonthermal Plasma
【24h】

Oxidation Mechanisms of CF_2Br_2 and CH_2Br_2 Induced by Air Nonthermal Plasma

机译：空气非热等离子体诱导CF_2Br_2和CH_2Br_2的氧化机理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Oxidation mechanisms in air nonthermal plasma (NTP) at room temperature and atmospheric pressure were investigated in a corona reactor energized by +dc, -dc, or +pulsed high voltage.. The two bromomethanes CF_2Br_2 and CH_2Br_2 were chosen as model organic pollutants because of their very different reactivities with OH radicals. Thus, they served as useful mechanistic probes: they respond differently to the presence of humidity in the air and give different products. By FT-IR analysis of the postdischarge gas the following products were detected and quantified: CO_2 and CO in the case of CH_2Br_2, CO_2 and F_2C-O in the case of CF_2Br_2. F_2C=O is a long-lived oxidation intermediate due to its low reactivity with atmospheric radicals. It is however removed from the NTP processed gas by passage through a water scrubber resulting in hydrolysis to CO_2 and HF. Other noncarbon containing products of the discharge were also monitored by FT-IR analysis, including HNO_3 and N_2O. Ozone, an important product of air NTP, was never detected in experiments with CF_2Br_2 and CH_2Br_2 because of the highly efficient ozone depleting cycles catalyzed by BrOx species formed from the bromomethanes. It is concluded that, regardless of the type of corona applied, CF_2Br_2 reacts in air NTP via a common intermediate, the CF_2Br radical. The possible reactions leading to this radical are discussed, including, for -dc activation, charge exchange with O_2~-, a species detected by APCI mass spectrometry.
机译：在+ dc，-dc或+脉冲高压下，在电晕反应器中研究了室温和大气压下空气非热等离子体（NTP）中的氧化机理。由于以下原因，选择了两种溴甲烷CF_2Br_2和CH_2Br_2作为有机污染物的模型。它们与OH自由基的反应性非常不同。因此，它们充当了有用的机械探针：它们对空气中湿度的反应不同，并提供不同的产品。通过对放电后气体的FT-IR分析，检测并定量了以下产物：CH_2Br_2时为CO_2和CO，CF_2Br_2为CO_2和F_2C-O。 F_2C = O是一种长寿命的氧化中间体，因为它与大气自由基的反应性较低。但是，通过水洗器将其从NTP处理过的气体中除去，导致水解为CO_2和HF。还通过FT-IR分析监测了放电的其他非含碳产物，包括HNO_3和N_2O。臭氧是空气NTP的重要产物，在CF_2Br_2和CH_2Br_2的实验中从未发现过，因为由溴甲烷形成的BrOx物种催化了高效的臭氧消耗循环。结论是，不管施加何种电晕，CF_2Br_2都会在空气NTP中通过共同的中间体CF_2Br自由基反应。讨论了导致该自由基的可能反应，包括-dc活化，与O_2〜-的电荷交换，O_2〜-通过APCI质谱检测到。

著录项

  • 来源
    《Environmental Science & Technology》 |2013年第1期|542-548|共7页
  • 作者

    Milko Schiorlin; Ester Marotta; Marta Dal Molin; Cristina Paradisi;

  • 作者单位

    Department of Chemical Sciences, Universita di Padova, via Marzolo 1, 35131 Padova, Italy;

    Department of Chemical Sciences, Universita di Padova, via Marzolo 1, 35131 Padova, Italy;

    Department of Chemical Sciences, Universita di Padova, via Marzolo 1, 35131 Padova, Italy;

    Department of Chemical Sciences, Universita di Padova, via Marzolo 1, 35131 Padova, Italy;

  • 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
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号