Catalytic activity of electrodeposited cobalt oxide films for methane combustion in a micro-channel reactor
Catalytic activity of electrodeposited cobalt oxide films for methane combustion in a micro-channel reactor
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DOI：
10.1016/j.fuel.2018.05.114
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发表时间：
2018-11
期刊：
影响因子：
7.4
通讯作者：
J. M. Rodrigues;M. Ribeiro;E. Fernandes
中科院分区：
文献类型：
--
作者：
J. M. Rodrigues;M. Ribeiro;E. Fernandes
研究了甲烷-空气混合物在涂有Co 3 O 4薄膜的微通道反应器中的催化燃烧。Co 3 O 4通过廉价的电沉积方法涂覆在反应器通道上。用所述方法制造具有大的可及表面积的内聚膜，其允许控制膜厚度。甲烷在760 °C下完全燃烧。所获得的催化活性曲线表明，在高达600 °C的温度下，该反应仅通过催化燃烧进行，而在更高的温度下，气相和催化燃烧可能同时发生。测量的每单位面积的催化反应速率与对于类似反应器和操作条件报道的反应速率一致。结果表明，在总共50 h的循环操作后，催化膜没有失活。在600 °C下，不同反应物浓度的实验表明，甲烷浓度对反应速率有一级依赖性，氧气浓度对反应速率有近零级依赖性。用文献中提出的化学模型对实测数据进行了拟合。总体而言，这项工作突出了使用廉价的电沉积膜的Co 3 O 4的微通道反应器的碳氢化合物的燃烧的潜力。
This paper studies the catalytic combustion of a methane-air mixture inside a micro-channel reactor coated with cobalt oxide (Co3O4) film. The Co3O4was coated on the reactor channels by an inexpensive electrodeposition method. A cohesive film with large accessible surface area was fabricated with the method described, which allowed the control of the film thickness. Complete combustion of methane was achieved at 760 °C. The catalytic activity profiles obtained suggest that the reaction is carried only via catalytic combustion up to 600 °C, while both gas-phase and catalytic combustion might occur simultaneously at higher temperatures. The measured catalytic reaction rate per unit area was aligned with the reaction rate reported for similar reactors and operating conditions. Results showed that the catalytic films did not deactivate after a total of 50 h of cyclic operation. Tests with different reactants concentration revealed a first order dependence of the reaction rates for methane concentration and a near zero-order dependence on the oxygen concentration, at 600 °C. The measured data was successfully fitted by a chemistry model proposed in the literature. Overall, this work highlights the potential of using inexpensive electrodeposited films of Co3O4on micro-channel reactors for combustion of hydrocarbons.