吸附量热仪及其体积校正  

ADSORPTIVE MICROCALORIMETER AND ITS VOLUME CALIBRATION

作　　者：沈俭一[1] 王谷丰[1] 

机构地区：[1]南京大学化学系

出　　处：《催化学报》1998年第2期159-162,共4页

基　　金：国家教委跨世纪优秀人才基金;国家自然科学基金

摘　　要：简要介绍了吸附量热仪的结构和工作原理，对吸附量热测定中的关键问题即体积标定进行了探讨．由于进样部分和吸附部分处于不同温度，在用氦气进行死体积标定时，需要运用校正因子法或假体积法．本文在比较了两种方法后，得出结论：若在工作中，两部分温度均保持不变，则两种方法得到的数据是一致的；若温度发生变化，则使用校正因子更可靠．The principle and apparatus construction for microcalorimetric adsortpion are outlined. The key to the accuracy of measurement of differential adsorption heat is the dead volume calibration for cell section. Since the dosing and cell sections are usually held at different temperatures, a γ factor should be used to correct the effect of temperature difference, otherwise, a pseudo dead volume is obtained. By estimating the errors, it is found that both methods of using the γ factor and the pseudo volume give accurate results when temperature variations for the sections are negligible. However, when the temperature shift occurs for either dosing or cell section, the γ factor is more reliable to use than the pseudo volume in determining the adsorption amount. The γ factor can be obtained by measuring the dead volume of the cell section at the room and adsorption temperatures, respectively.

关 键 词：吸附量热仪 体积标定 表面吸附 催化机理 

分 类 号：O641.31[理学—物理化学] O647.32[理学—化学]