KDP晶体的高温热行为及其热脱水反应动力学研究  

Investigation on High Temperature Behavior and Thermal Dehydration Kinetics of KDP Crystal

作　　者：丁建旭[1,2] 赵迎[2] 王圣来[3] 谷亦杰[2] 崔洪芝[2] 刘洪权[2] 徐国纲[2] 

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,青岛266590 [2]山东科技大学材料科学与工程学院,青岛266590 [3]山东大学晶体材料国家重点实验室,济南250100

出　　处：《人工晶体学报》2015年第5期1227-1232,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51202131);山东科技大学人才引进科研启动基金(2014RCJJ001);山东科技大学杰出青年科技人才支持计划;山东煤炭安全高效开采技术与装备协同创新中心资助(2014JQJH102)

摘　　要：采用热重（TG-DTA）、定压比热（Cp）和原位高温红外反射光谱等热分析手段研究了四方相KDP晶体室温至260℃之间的高温热行为。实验发现：KDP晶体在183℃附近并未发生四方相到单斜相的相变或发生脱水反应;且晶体于207-210℃左右开始分解,随温度上升,分解过程分为三个阶段。第一个分解阶段出现P2O2-7基团的吸收峰,意味着第一阶段的分解朝着K4P2O7的方向进行;第二阶段是第一阶段产生的中间态产物继续分解的过程;第三个分解阶段为前两个过程的继续分解,最终KDP完全分解为KPO3。通过Kissinger法,根据热重数据计算了KDP在260℃前两个明显的分解过程的动力学参数,其热脱水活化能分别为101.7 J·mol^-1和112.4 J·mol^-1。The high temperature behavior of tetrahedral phase of KDP crystal was depicted by using thermo gravimetry-differential thermal analysis,specific heat and in-situ infrared reflective spectra over the temperature range from room temperature to 260 ℃,respectively. The experimental results show that no phase transition from tetragonal to monoclinic or dehydration occurrs near 183 ℃,and the dehydration begins at 207-210 ℃. The dehydration undergoes three alterations as temperature increasing. In the first alteration,new peaks in representation of P2O2-7appear which means dehydration occurrs in the direction to K4P2O7. The second alteration is the continuous decomposition of the intermediates. The last alteration is the continuous decomposition of the intermediates yielded in the second stage and translates to KPO3 ultimately. Based on the Kissinger method,the thermal dehydration kinetics of KDP crystal is calculated in terms of the TG data and the active energy are acquired for 101. 7 J ·mol- 1and 112. 4 J·mol- 1,respectively.

关 键 词：KDP晶体 高温热行为 热脱水 动力学 KISSINGER 

分 类 号：TQ586.1[化学工程—精细化工]