磷酸活性炭自燃过程反应动力学研究  

Study on Spontaneous Ignition Reaction Kinetics of H_3PO_4-activated Carbon

作　　者：张宏哲[1,2,3] 

机构地区：[1]化学品安全控制国家重点实验室,山东青岛266071 [2]中国石油化工股份有限公司青岛安全工程研究院,山东青岛266071 [3]国家安全生产监督管理总局化学品登记中心,山东青岛266071

出　　处：《中国安全科学学报》2012年第5期44-49,共6页China Safety Science Journal

基　　金：国家"973"课题(2010CB735510)

摘　　要：为研究磷酸活性炭的自燃危险性,以自制的磷酸活性炭(活化温度为300,500和700℃)为考察对象,利用同步热分析仪(STA)对活性炭氧化放热动力学进行试验研究。根据在2,5,10和20℃/min等4种不同升温速率下得到的活性炭DSC/TG曲线,结合Friedman-Reich-Levi动力学方法对反应过程中可能存在的反应机理进行初步判断。研究表明,随着活化温度的升高,活性炭的起始放热温度和最大放热温度随之升高;活性炭整个氧化反应过程中,活化能随着转化率的改变呈现一定规律性变化;碳氧化学反应和气体扩散共同影响活性炭氧化过程,且在不同阶段对氧化的贡献不同。For the sake of investigating the spontaneous ignition risk of H3 PO^-activated carbon（ AC）, a systematic research on the AC oxidation kinetics was conducted by STA. The kinetics and mechanism of the oxidation of AC were presented by the DSC/TG curves of AC at different heating rates （2℃/rain, 5℃/min, lO℃/min, 20℃/min） and the Friedman-Reich-Levi method of kinetic analysis. The results show that the onset exothermic temperature and peak temperature of AC shift to the high-temperature region with the activation temperature increasing. The variation of activation energy values with the conversion rate was investigated in the whole oxidation reaction process. It is also confirmed that chemical reactions of carbon and oxygen and gas diffusion affect the process of oxidation of AC, and their contributions at differ- ent stages of the progress are different.

关 键 词：活性炭自燃 同步热分析仪(STA) Friedman-Reich-Levi法 热动力学参数 反应机理 

分 类 号：X937[环境科学与工程—安全科学]