Intensification of Rate of Diffusion Controlled Reactions in a Parallel Plate Electrochemical Reactor Stirred by a Curtain of Electrochemically Generated Gas Bubbles
Intensification of Rate of Diffusion Controlled Reactions in a Parallel Plate Electrochemical Reactor Stirred by a Curtain of Electrochemically Generated Gas Bubbles
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电化学产生气泡幕搅拌的平行板电化学反应器中扩散控制反应速率的强化
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
I. Nirdosh
中科院分区：
文献类型：
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作者：
G. Sedahmed;I. Nirdosh
通过测定k3fe (CN) 6在碱性溶液中阴极还原的极限电流，测定了上游板上电化学生成的氧气气泡上升幕在垂直板上搅拌的传质速率。与先前报道的从酸化溶液中沉积铜的情况下的2-5倍的范围相比，发现传质率比自然对流值增加了2.4 - 25倍。氧泡在碱性溶液中高的聚结倾向被认为是碱性溶液中高传质速率的原因。在氧气气泡幕搅拌下，传质速率随板高和电解质浓度的增加而降低。研究发现，与氧气相比，h2气泡幕在提高传质速率方面效果较差。重点介绍了研究结果在对电极气幕搅拌的改进型平行板电化学反应器设计中的实际应用。建议的设计有可能节省部分或全部的机械搅拌能量，以及地板空间，因为它垂直延伸。
Rates of mass transfer were measured at a vertical plate stirred by a rising curtain of oxygen bubbles generated electrochemically at an upstream plate by measuring the limiting current of the cathodic reduction of K 3 Fe(CN) 6 in alkaline solution. The rate of mass transfer was found to increase over the natural convection value by a factor ranging from 2.4 to 25 compared to the previously reported range of 2-5 in the case of copper deposition from acidified solutions. The high tendency of oxygen bubbles to coalesce in alkaline solutions is believed to be responsible for the high rates of mass transfer in alkaline solutions. The rate of mass transfer at a plate stirred by a curtain of oxygen bubbles was found to decrease with increasing plate height and electrolyte concentration. Curtains of H 2 bubbles were found to be less effective in enhancing the rate of mass transfer compared to that of oxygen. Practical application of the results in designing a modified parallel plate electrochemical reactor stirred by a counterelectrode gas curtain was highlighted. The suggested design has the potential of saving part or all of the mechanical stirring energy as well as floor space since it extends vertically.