碱性分子筛上不同吸附物的TPD研究

STUDY OF ADSORBATES IN CHARACTERIZING BASIC ZEOLITE BY TPD

借助吸附不同酸性物的程序升温方法研究了碱金属交换的Ｘ型分子筛的碱性。发现吸附物对分子筛碱性的ＴＰＤ表征有很大影响。主要与吸附物的分子体积和酸强度两种因素有关，并对这些影响因素进行了分析。结果表明，甲酸做吸附物对用ＴＰＤ表征分子筛的碱性相对比较可靠。

A series of TPD profiles of several acidic adsorbates on alkali ion exchanged X zeolite has been studied.The result shows that there are many differences when the adsorbate is not identical,in ferms of the profiles of TPD,the number of desorptive adsorbates and temperature Tm, Two kinds of effective factors are suggested to explain the differences in profiles and desorption,When carbon dioxide adsorbs on basic zeolite,there is no significant peak during the process of desorption.The TPD result of differnet adsorbates show that formic acid is a better relative probe molecule on basic zelite than the others;The relation between adsorbent molecule and sample is important for TPD study.