Diffusion mechanism of CO2 in 13X zeolite beads

被引:88
作者
Hu, Xiayi [1 ]
Mangano, Enzo [1 ]
Friedrich, Daniel [1 ]
Ahn, Hyungwoong [1 ]
Brandani, Stefano [1 ]
机构
[1] Univ Edinburgh, Scottish Carbon Capture & Storage, Sch Engn, Edinburgh EH9 3JL, Midlothian, Scotland
来源
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY | 2014年 / 20卷 / 01期
基金
英国工程与自然科学研究理事会;
关键词
Carbon dioxide; Zeolite; Mass transfer kinetics; Adsorption; Carbon capture; PRESSURE SWING ADSORPTION; CARBON-DIOXIDE; FLUE-GAS; FREQUENCY-RESPONSE; RECOVERY; SORPTION; CAPTURE; EQUILIBRIUM; KINETICS; NITROGEN;
D O I
10.1007/s10450-013-9554-z
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
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 A degrees 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.
引用
收藏
页码:121 / 135
页数:15
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