摘要
建立了一套停流动技术与紫外光吸收监测相偶合的实验装置,可研究生物质焦油的热解反应机理。该装置有效地应用于研究高温快速反应,监测活性反应中间体。甲苯是固态燃料热解焦油的主要成分,已作为焦油模型化合物用于研究焦油还原NOX的反应。利用停流动实验装置,进行了在973.15～1273.15K温度范围内的甲苯裂解主要反应途径:C6H5CH3—→C6H5CH2+H(1)的研究。通过监测苄基(C6H5CH2)在266.11mm处紫外吸收的变化,结合甲苯热解化学动力学模型计算苄基浓度随时间的变化,得到反应(1)的一阶速率表达式为k1=1.88×1016exp(-363.012/RT)。
A stopped-flow apparatus based on stopped-flow technique coupling with UV absorbance measurements was set up to study the mechanism ofbiomass tar pyrolysis. The apparatus was extremely useful for studying reactions that were too fast at high temperature and for detecting reactive intermediates. Toluene shares an important part in solid fuels pyrolysis tar, which was used as model tar compound to study NOxreduction by tar. The main thermal decomposition channel of toluene, C6H5CH3 →C6H5CH2 ＋ H （ 1 ）, was investigated in the stoppedflow apparatus experiments over the temperature range of 973.15 - 1 273.15 K. Rate coefficient for reaction （1） was determined by monitoring benzyl radical （C6H5CH2） absorption at 266.11 nm during the pyrolysis oftoluene and modeling the temporal behavior ofthe benzyl concentration with a kinetic model. The first-order rate coefficient for reaction （ 1 ） can be expressed as k1 = 1.88 × 10^16exp （ - 363.012/RT）.
出处
《工业加热》
CAS
2009年第5期39-42,46,共5页
Industrial Heating
关键词
停流动技术
紫外光谱
实验
模型
stopped-flow technique
UV spectrum
experiment
model
