高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (2): 375.doi: 10.7503/cjcu20140473

• 物理化学 • 上一篇    下一篇

高热值多面体硼氢化合物十氢十硼酸双四乙基铵的合成、 热分解机理及动力学研究

薛云娜1, 李娇毅1, 郝志军1, 万洪1, 赵海霞2, 李春迎1, 杜咏梅1, 陆居有1, 余秦伟1, 吕剑1,*()   

  1. 1. 西安近代化学研究所, 西安 710065
    2. 中北大学化工与环境学院, 太原 030051
  • 收稿日期:2014-05-21 出版日期:2015-02-10 发布日期:2015-01-15
  • 通讯作者: 吕剑 E-mail:lujian204@263.net
  • 作者简介:联系人简介: 吕 剑, 男, 博士, 研究员, 博士生导师, 主要从事催化合成技术研究. E-mail: lujian204@263.net
  • 基金资助:
    国防重大专项项目(批准号: 00402040202)资助

Synthesis, Thermal Decomposition Mechanism and Kinetic Equation of Polyhedral Boron Hydride Compound [(C2H5)4N]2B10H10 with High Enthalpy of Combustion

XUE Yunna1, LI Jiaoyi1, HAO Zhijun1, WAN Hong1, ZHAO Haixia2, Li Chunying1, DU Yongmei1, Lu Juyou1, Yu Qinwei1, Lü Jian2()   

  1. 1. Xi’an Modern Chemistry Research Institute, Xi’an 710065, China
    2. School of Chemical and Environmental Engineering, North University of China, Taiyuan 030051, China)
  • Received:2014-05-21 Online:2015-02-10 Published:2015-01-15
  • Supported by:
    Supported by the Special Program of National Defense Project of China(No. 00402040202).

摘要:

以四氢硼酸四乙基铵为原料, 通过热解反应合成了十氢十硼酸双四乙基铵, 并采用红外光谱(IR), 核磁共振波谱(1H NMR, 11B NMR)及元素分析对其结构进行了表征. 采用差热-热重(DSC-TG)分析研究了其在氩气及氧气气氛下的热稳定性, 发现其在氩气中仅发生热分解反应, 放热量较小, 而在氧气中则先分解, 再发生氧化反应并放出大量的热. 采用Kissinger方法及Coat-redfern方程得到其热分解主反应的动力学方程, 并进一步通过热裂解原位池-傅里叶变换红外光谱(FTIR)联用技术和同步热分析-红外-质谱(DSC-TG-FTIR-MS)联用技术研究了其热分解机理, 推测在加热升温过程中, 化合物在303.2 ℃下快速分解, 气相产物主要为乙烷与少量氨气及氢气, 固相产物为单质硼.

关键词: 十氢十硼酸双四乙基铵, 热分解机理, 动力学方程, 热稳定性

Abstract:

As a promising burning rate modifier of propellents, the boron hydride salt [(C2H5)4N]2B10H10 was synthesized by the pyrolysis of tetraethylammonium borohydride and characterized by IR, 1H NMR, 11B NMR and elementary analysis. The thermal stabilities in Ar or in O2 were investigated by DSC and TG. The results showed that it decomposed with less heat release in Ar. But in O2, it decomposed at first then was oxided with more heat release. The kinetic equation of thermal decomposition reaction was obtained by Kissinger method and Coat-Redfern program. Using combined solid reaction cell in-situ and FTIR, DSC-TG-FTRI-MS simultaneous techniques, thermal decomposition mechanism was supposed, the compound decomposes at 303.2 ℃, and produces C2H6, NH3, H2 and B.

Key words: (C2H5)4N]2B10H10, Thermal decomposition mechanism, Kinetic equation, Thermal stability

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