NDLI: Diffusion mechanism of CO2 in 13X zeolite beads

Content Provider	Springer Nature Link
Author	Hu, Xiayi Manga, Enzo Friedrich, Daniel Ahn, Hyungwoong Brandani, Stefa
Copyright Year	2013
Abstract	A systematic study of the diffusion mechanism of CO2 in commercial 13X zeolite beads is presented. In order to gain a complete understanding of the diffusion process of CO2, kinetic measurements with a zero length column (ZLC) system and a volumetric apparatus have been carried out. The ZLC experiments were carried out on a single bead of zeolite 13X at 38 °C at a partial pressure of CO2 of 0.1 bar, conditions representative of post-combustion capture. Experiments with different carrier gases clearly show that the diffusion process is controlled by the transport inside the macropores. Volumetric measurements using a Quantachrome Autosorb system were carried out at different concentrations. These experiments are without a carrier gas and the low pressure measurements show clearly Knudsen diffusion control in both the uptake cell and the bead macropores. At increasing CO2 concentrations the transport mechanism shifts from Knudsen diffusion in the macropores to a completely heat limited process. Both sets of experiments are consistent with independent measurements of bead void fraction and tortuosity and confirm that under the range of conditions that are typical of a carbon capture process the system is controlled by macropore diffusion mechanisms.
Starting Page	121
Ending Page	135
Page Count	15
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	20
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2013-06-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon dioxide Zeolite Mass transfer kinetics Adsorption Carbon capture Industrial Chemistry/Chemical Engineering Surfaces and Interfaces, Thin Films Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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