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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spectroscopy of Hydrothermal Reactions. 14. Kinetics of the pH-Sensitive Aminoguanidine-Semicarbazide-Cyanate Reaction Network
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Spectroscopy of Hydrothermal Reactions. 14. Kinetics of the pH-Sensitive Aminoguanidine-Semicarbazide-Cyanate Reaction Network

机译：水热反应的光谱学。 14. pH敏感的氨基胍-氨基脲-氰酸盐反应网络的动力学

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摘要

Infrared spectroscopy in conjunction with an optically accessed flow reactor enable real-time concentration measurements to be made on species involved in hydrothermal reactions. The kinetics of the reaction of the aqueous cyanate ion, OCN~-, at 110-160 deg C and 275 bar were determined at pH = 3.94-10.5. These kinetics are useful because OCN~- is frequently the precursor to the NH_3 and CO_2 products seen during the hydrothermolysis of organic amines. Three rate constants were needed to model the cyanate reaction. These rates were then used to model the hydrothermolysis kinetics of the progressively more complex reactions of the isoelectronic cations of semicarbazide (t = 140-170 deg C) and aminoguanidine (T = 190-260 deg C) in neutral and acidic solutions. Six internally consistent rate constants were obtained in order to specify the reaction network.
机译：红外光谱结合光学访问的流动反应器，可以对涉及水热反应的物质进行实时浓度测量。在pH ＝ 3.94-10.5下测定在110-160℃和275bar下的含水氰酸根离子OCN-的反应动力学。这些动力学是有用的，因为在有机胺的加氢热解过程中，OCN-通常是NH_3和CO_2产物的前体。需要三个速率常数来模拟氰酸酯反应。然后将这些速率用于模拟中性和酸性溶液中氨基脲（t = 140-170℃）和氨基胍（T = 190-260℃）的等电阳离子的逐步复杂反应的加氢热动力学。为了指定反应网络，获得了六个内部一致的速率常数。

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