Heat transfer and thermographic analysis of catalyst surface during multiphase phenomena under spray-pulsed conditions for dehydrogenation of cyclohexane over Pt catalysts.
Heat transfer and thermographic analysis of catalyst surface during multiphase phenomena under spray-pulsed conditions for dehydrogenation of cyclohexane over Pt catalysts.
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DOI：
10.1021/jp0558268
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
R. Biniwale;N. Kariya;H. Yamashiro;M. Ichikawa
中科院分区：
文献类型：
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作者：
R. Biniwale;N. Kariya;H. Yamashiro;M. Ichikawa
在Pt/铝石和Pt/活性炭催化剂上进行了环己烷脱氢，用于储氢和向燃料电池供应。利用脉冲喷注环己烷在催化剂表面形成非定常状态，促进吸热反应的高效发生。催化剂表面温度越高越有利于反应的进行，因此在干湿交替条件下使用脉冲喷射产生的传热现象和温度分布就变得非常重要。利用红外热像仪对催化剂表面温度分布进行监测，同时对产物进行分析。利用快速温度记录和热电偶装置估计了从板式加热器到催化剂的热流密度。瞬态条件下估计的热流密度在10-15 kW/m(2)范围内，相当于本研究中使用的吸热反应对注入频率为0.5 Hz的要求。通过对活性炭布和铝土两种载体上反应产物的温度分布分析，发现铝土等导电载体更适合环己烷的脱氢反应。
Dehydrogenation of cyclohexane over Pt/alumite and Pt/activated carbon catalysts has been carried out for hydrogen storage and supply to fuel cell applications. An unsteady state has been created using spray pulsed injection of cyclohexane over the catalyst surface to facilitate the endothermic reaction to occur efficiently. Higher temperature of the catalyst surface is more favorable for the reaction, thus the heat transfer phenomena and temperature profile under alternate wet and dry conditions created using spray pulsed injection becomes important. IR thermography has been used for monitoring of temperature profile of the catalyst surface simultaneously with product analysis. The heat flux from the plate-type heater to the catalyst has been estimated using a rapid temperature recording and thermocouple arrangement. The estimated heat flux under transient conditions was in the range of 10-15 kW/m(2), which equates the requirement for endothermic reactions to the injection frequency of 0.5 Hz, as used in this study. The analysis of temperature profiles, reaction products over two different supports namely activated carbon cloth and alumite, reveals that the more conductive support such as alumite is more suitable for dehydrogenation of cyclohexane.