Complex sorption kinetics of carbon dioxide in NaX-zeolite crystals

被引：14
作者：
Bülow, M [1 ]
机构：
[1] BOC Proc Plants Technol, Murray Hill, NJ 07974 USA
来源：
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY | 2002年 / 8卷 / 01期
关键词：
NaX and BaKX zeolites; carbon dioxide; sorption kinetics; complex rate mechanism; IR spectroscopy; chemisorption;
D O I：
10.1023/A:1015210205270
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ad-/desorption-kinetic measurements were performed for carbon dioxide on a mono-disperse crystal sample of NaX-type zeolite (mean crystal diameter: 2R congruent to (100 +/- 6) mum) by a constant-volume-variable-pressure method in a "differential" concentration mode over ranges of temperature, (193-293) K, and pressure, (20-26,700) Pa. They revealed a complex sorption process in sorbate uptake and release during experiments of ad- and desorption, respectively, which is comprised of a slow, hitherto unknown rate mechanism superimposed on very fast intracrystalline diffusion of carbon dioxide. IR-spectroscopic data that evidence formation of chemisorption species in CO2-NaX sorption systems may allow for a tentative interpretation of this finding. Circumstantial evidence for the correctness of this conclusion follows from sorption-kinetic experiments for carbon dioxide on BaKX-type zeolite crystals (mean crystal diameter: 2R congruent to (120 +/- 6) mum).
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页码：9 / 14
页数：6
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