热重-红外联用气体产物光谱信号定量研究  

Quantitative research of evolved gas rate by TGA-FTIR

作　　者：陈玲红[1] 吴学成[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2009年第7期1332-1336,共5页Journal of Zhejiang University：Engineering Science

基　　金：教育部留学回国人员科研启动基金资助项目;国家自然科学基金重点资助项目(60534030);国家重点基础研究发展计划资助项目(2009CB219802)

摘　　要：针对热重-红外联用分析中确定气体产物的释放速率对了解热分解过程、气固反应的重要性,通过关联热重分析仪中测得的固体样品质量损失速率,提出了依据傅里叶红外光谱仪测得的非对称性气体产物响应光谱信号强度时间变化,获得该气体逸出速率的定量校正分析方法.并以热重-红外联用碳酸钙样品热分解过程为例,重点讨论了载气流速、样品质量等参数对逸出气体光谱信号滞后、形变的影响.结果发现,气体传输滞留时间、扩散逆混合时间主要取决于载气流速,而与样品质量无关.Quantitative determination of the evolved gas rate in the combined theromogravimetry （TGA） and Fourier transform infrared （FTIR） analysis is important when investigating decomposition processes or gas-solid reactions. A quantitative calibration method was developed to obtain the evolved nonhomonuclear gas rate from the temporal FTIR absorbance intensity signal by relating with the solid sample mass loss rate in TGA measurement. Based on experimental studies of decomposition of calcium carbonate in TGA- FTIR applications, the influence of several experimental parameters such as the carrier gas flow rate and sample mass on the delay and shape deviation of FTIR signal was discussed. The results showed that the time of transport delay, diffusion and back-mixing was dependent on the carrier flow rate, but independent on the sample mass.

关 键 词：热重-红外联用 气体逸出速率 定量校正方法 

分 类 号：TK6[动力工程及工程热物理—生物能]