A calorimetric investigation of CO, N2, and O2 in alkali-exchanged MFI

被引：59

作者：

Savitz, S ^{[1
]}

Myers, AL ^{[1
]}

Gorte, RJ ^{[1
]}

机构：

[1] Univ Penn, Dept Chem Engn, Philadelphia, PA 19104 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2000年 / 37卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

adsorption; alkali-exchanged zeolites; calorimetry; carbon monoxide; nitrogen; oxygen;

D O I：

10.1016/S1387-1811(99)00190-0

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

We have examined the adsorption of CO, N-2, and O-2 at 195 K in siliceous MFI (silicalite) and Li-, Na-, and K-exchanged MFI using microcalorimetry. The differential, isosteric heats demonstrate that CO and N-2 interact strongly with cations, while isosteric heats for O-2 were not affected by the presence of the cations. The zero-coverage heats for CO and N-2 decreased with increasing size of the alkali cation. On Li-MFI, the differential heats dropped to the value observed on silicalite at coverages only slightly above the site density for Li. In contrast, the heat profiles on Na-MFI and K-MFI suggest that more than one molecule can interact with a single cation. The implications of these results for characterization of adsorbents are discussed. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：33 / 40

页数：8

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