Abstract

Information on the thermal decomposition of the double complex salt (DCS) [Cr(ur)₆][Co(CN)₆]⋅4Н₂О (ur is urea CO(NH₂)₂) in the temperature range of 30–1000°C has been presented. The thermolysis of the studied DCS has been carried out in an argon atmosphere at three heating rates (5, 10, 20°C/min). The obtained TG data have been processed using the ARKS TA, and then the kinetics has been evaluated by the ARKS FK program from data for 5 and 10°C/min. The proposed multi-stage formal kinetic model provided a good fit of experimental data and showed a very reasonable prediction of decomposition at a rate of 20°C/min. It was demonstrated the formation of cyanobridge structures during thermolysis. A metastable compound Co₃Cr was found in the product of thermolysis at 550°C. The mixture of the final products of calcination has been comprised Co⁰ (α-face-centered cubic lattice (fcc), β-fcc), Cr₂O₃, Cr₇C₃, Cr₂₃C₆, Cr_21.26Co_1.74C₆.

中文翻译：

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双络合物盐[Cr(ur)6][Co(CN)6]⋅4Н2О的热分解动力学

摘要

复盐 (DCS) [Cr(ur) ₆ ][Co(CN) ₆ ]⋅4Н ₂ О (ur 是尿素 CO(NH ₂ ) _{2的热分解信息}) 在 30–1000°C 的温度范围内进行了介绍。所研究的 DCS 的热解已在氩气氛中以三种加热速率（5、10、20°C/min）进行。使用 ARKS TA 处理获得的 TG 数据，然后通过 ARKS FK 程序根据 5 和 10°C/min 的数据评估动力学。所提出的多阶段形式动力学模型提供了良好的实验数据拟合，并显示了以 20°C/min 的速率分解的非常合理的预测。证明了在热解过程中形成了氰桥结构。在550℃的热解产物中发现了一种亚稳态化合物Co _{3 Cr。}煅烧最终产物的混合物包括 Co ⁰ (α-面心立方晶格 (fcc), β-fcc), Cr ₂O ₃、Cr ₇ C ₃、Cr ₂₃ C ₆、Cr _21.26 Co _1.74 C ₆。