...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Measurement report: Sulfuric acid nucleation and experimental conditions in a photolytic flow reactor
【24h】

Measurement report: Sulfuric acid nucleation and experimental conditions in a photolytic flow reactor

机译：测量报告：光解流反应器中的硫酸成核和实验条件

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nucleation rates involving sulfuric acid and water measured in a photolytic flow reactor have decreased considerably over a time period of several years. Results show that the system – flow reactor, gas supplies and lines, flow meters, valves, H 2 SO 4 photo-oxidant sources – has reached a baseline stability that yields nucleation information such as cluster free energies. The baseline nucleation rate is punctuated by temporary bursts that in many instances are linked to cylinder changes, delineating this source of potential contaminants. Diagnostics were performed to better understand the system, including growth studies to assess H 2 SO 4 levels, chemiluminescent NO and NO x detection to assess the HONO source, and deployment of a second particle detector to assess the nanoparticle detection system. The growth of seed particles shows trends consistent with the sizes of nucleated particles and provides an anchor for calculated H 2 SO 4 concentrations. The chemiluminescent detector revealed that small amounts of NO are present in the HONO source, ～ ?10?% of HONO. The second condensation-type particle counter indicates that the nanoparticle mobility sizing system has a bias at low sulfuric acid levels. The measured and modeled nucleation rates represent upper limits to nucleation in the binary homogeneous system, H 2 SO 4 -H 2 O, as contaminants might act to enhance nucleation rates and ion-mediated nucleation may contribute. Nonetheless, the experimental nucleation rates, which have decreased by an order of magnitude or larger since our first publication, extrapolate to some of the lowest rates reported in experiments with photolytic H 2 SO 4 . Results from experiments with varying water content and with ammonia addition are also presented and have also decreased by an order of magnitude from our previous work; revised energetics of clusters in this three-component system are derived which differ from our previous energetics mainly in the five-acid and larger clusters.
机译：涉及在光解流反应器中测量的硫酸和水的核酸率在几年的时间内显着降低。结果表明，系统 - 流量反应器，气体供应和线路，流量计，阀门，H 2 SO 4光氧化源 - 已达到基线稳定性，从而产生诸如集群自由能等核心信息。基线成核速率被临时爆发标点，在许多情况下，与气缸变化有关，划定了潜在污染物的来源。进行诊断以更好地了解系统，包括增长研究，以评估H 2 SO 4水平，化学发光NO和NO X检测，以评估Hono源，并展开第二颗粒检测器以评估纳米粒子检测系统。种子颗粒的生长显示与核化颗粒的尺寸一致的趋势，并提供用于计算的H 2 SO 4浓度的锚。化学发光探测器显示出在隆起源中存在少量的NO，〜？10？％HONO。第二缩合型粒子计数器表明纳米颗粒迁移率施胶系统具有低硫酸水平的偏压。测量和建模的成核速率表示二元均匀系统中成核的上限，H 2 SO 4 -H 2 O，因为污染物可以采用增强成核率和离子介导的成核可能有贡献。尽管如此，实验成核率由于我们的第一次出版以来，其推断出在光解H 2 SO 4的实验中报告的一些最低速率下降的数量级或更大的核心速率。还提出了不同水含量和氨的实验的结果，并从我们以前的工作中减少了数量级;该三分组系统中的群集的经验丰富的能量学被推导出来，这主要与我们以前的能量学主要不同于五酸和更大的集群。

著录项

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