化工学报Issue(2)：576-582,7.DOI:10.3969/j.issn.0438-1157.2014.02.030
热重分析法研究氢氧化镁纳米粉体的非等温分解动力学
Non-isothermal decomposition kinetics of nano-Mg(OH)2 using thermal gravimetric analysis
摘要
Abstract
Hexagonal nano-magnesium hydroxide with thickness of 25-30 nm and diameter of 0.3-0.4 µm was synthesized via acid immersion and ammonia precipitation from dolomites. Its quality met the standards of typeⅠin HG/ T 3607-2000. The thermal decomposition kinetics of Mg(OH)2 was investigated by using thermal gravimetric analysis at different heating rates for deep understanding of physical chemistry in this process. The activation energies of decomposition estimated by the Kissinger and Ozawa methods were 115.47 kJ•mol-1 and 126.04 kJ•mol-1 respectively. Decomposition reaction of magnesium hydroxide was controlled by Avrami-Erofeev function (n=1.5). Pre-exponential was 3.077×1010 s-1. Nano-magnesium oxide with average diameter of 80-100 nm was prepared after calcination of magnesium hydroxide.关键词
纳米氢氧化镁/热重分析/热分解/动力学/纳米氧化镁Key words
nano-magnesium hydroxide/thermal gravimetric analysis/thermal decomposition/kinetics/nano-magnesium oxide分类
化学化工引用本文复制引用
李歌,李增和,马鸿文,陈登利..热重分析法研究氢氧化镁纳米粉体的非等温分解动力学[J].化工学报,2014,(2):576-582,7.基金项目
中央高校基本科研业务费项目（ZY1348）。@@@@supported by the Fundamental Research Funds for the China Central Universities (ZY1348) （ZY1348）
