氢气对正丁烷/空气混合物催化着火的热作用和化学作用  

Thermal and Chemical Effects of Hydrogen in Catalytic Ignition of n-Butane/Air Mixture

作　　者：钟北京[1] 熊鹏飞[1] 杨帆[1] 于亚薇[1] 

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《物理化学学报》2013年第5期897-902,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(51276096)资助项目~~

摘　　要：通过对正丁烷/氢气/空气混合物在Pt催化表面的详细反应机理分析,研究了氢气添加对正丁烷/空气混合物催化着火过程的影响.研究发现,在正丁烷/空气混合中添加氢气有助于正丁烷在更低的温度下实现催化着火,而且不同的氢气添加量对混合物的着火温度和着火过程呈现不同的影响:当氢气添加量较小时,氢气的作用主要呈现为热影响;而当氢气添加量较大时,氢气的作用主要呈现为化学影响.这些结果与实验结果是一致的.本文进一步确定了发挥不同作用的氢气添加量的范围,并分别对热作用和化学作用情况下的着火启动反应进行了动力学分析.The kinetics of the catalytic ignition processes of hydrogen^n-butane^air on Pt surface is studied to reveal the catalytic ignition mechanism. It is found that the ignition temperature of n-butane is lower when a certain amount of hydrogen is added. However, the effect of hydrogen on the catalytic ignition process and temperature of n-butane depends on the percentage of hydrogen added. When a small amount of hydrogen is added, it has a thermal effect. Adding more hydrogen gas causes it to have a chemical effect. A good fit is obtained between simulated and experimental data for the catalytic ignition temperatures. The ranges of hydrogen content with different effects are also predicted. Furthermore, this kinetic study shows that a different onset reaction of n-butane will lead to different ignition temperatures and mechanisms.

关 键 词：正丁烷 氢气 空气混合物 催化反应机理 催化着火 热作用与化学作用 Pt催化剂 

分 类 号：O643.32[理学—物理化学]