Wide-Temperature Range Kinetics of Neutral and Ionic Metal Combustion Reactions

CTS-9905265摘要这项工作的目标是提供准确的数据，以促进改进模型的金属物种在燃烧过程中，并提高理解和预测能力的温度依赖动力学的这种过程。 速率常数是在300-1800度K的温度范围内确定的，不受火焰中发生的其他反应的干扰，通过使用高温快速流动反应器（HTFFR）和高温光化学（HTP）系统，用激光诱导荧光（LIF）和质谱分析产品。 过去的工作集中在有毒元素（铬，锡，铜，镉，铅）的中性原子的反应;这项工作研究了这些元素（以及汞和钡）的中性一氯化物和一氧化物的反应，它们是金属氧化的初始产物。 本项目还研究了碱土金属阳离子的反应。金属在许多燃烧过程中作为添加剂、杂质或燃料起着重要作用。 目前这些过程的动力学信息非常有限。 然而，来自煤燃烧、柴油发动机和焚化炉的有毒金属种类越来越被认为是严重的空气污染物

CTS-9905265AbstractThe goals of this effort are to provide accurate data to facilitate improved models of metallic species in combustion processes and to enhance understanding of and predictive ability for the temperature-dependent kinetics of such processes. Rate constants are determined in the temperature range of 300-1800 degrees K free from interference by other reactions that occur in flames by using high-temperature fast-flow reactor (HTFFR) and high-temperature photochemistry (HTP) systems with products analyzed with laser-induced fluorescence (LIF) and mass spectrometry. Past work concentrated on reactions of neutral atoms of toxic elements (chromium, tin, copper, cadmium, lead); this effort examines reactions of the neutral monochlorides and monoxides of those elements (and also mercury and barium) which are initial products of metal oxidation. Also studied in this project are reactions of alkaline earth cations.Metals play an important role in many combustion processes as additives, impurities, or fuel. Current information of the kinetics of these processes is very limited. Increasingly, however, toxic metal species from burning of coal, diesel engines, and incinerators are recognized as serious air pollutants