Generation of pH-Oscillations in Closed Chemical Systems: Method and Applications

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• 作者：Eszter Poros ; Viktor Horv谩th ; Krisztina Kurin-Cs枚rgei ; Irving R. Epstein ; Mikl贸s Orb谩n
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：May 11, 2011
• 年：2011
• 卷：133
• 期：18
• 页码：7174-7179
• 全文大小：789K
• 年卷期：v.133,no.18(May 11, 2011)
• ISSN：1520-5126

文摘

All pH-oscillators reported to date function only under open (flow reactor) conditions. We describe an approach to generating pH-oscillations in a closed system by starting from an open system pH-oscillator, finding semibatch conditions under which it oscillates with an inflow of a single reactant to an otherwise closed reactor containing the remaining components, and replacing this inflow with a layer of silica gel impregnated with the key reactant. We present data showing the successful application of this technique to the BrO₃^{鈥?/sup>鈥揗n2+鈥揝O₃2鈥?/sup>, IO₃鈥?/sup>鈥揊e(CN)₆4鈥?/sup>鈥揝O₃2鈥?/sup>, and BrO₃鈥?/sup>鈥揊e(CN)₆4鈥?/sup>鈥揝O₃2鈥?/sup> systems. In all three cases, sulfite ion is the species that is replenished via dissolution from the gel layer.}