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Comparative study on low-temperature CO2 adsorption performance of metal oxide-supported, graphite-casted K2CO3 pellets.

Authors :
Zeng, Pengxin
Zhao, Chuanwen
Liang, Chenxi
Li, Peiyu
Zhang, Haoxuan
Wang, Ruilin
Guo, Yafei
Xia, Hongqiang
Sun, Jian
Source :
Separation & Purification Technology. Feb2023:Part A, Vol. 306, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

[Display omitted] • Graphite-casted K 2 CO 3 -based adsorbent pellets with different supports were prepared. • ZrO 2 -supported K 2 CO 3 pellets exhibit outstanding performance for CO 2 adsorption. • 500 °C is the optimal calcination temperature for SiO 2 -supported K 2 CO 3 pellets. • SiO 2 -supported K 2 CO 3 adsorbent pellets possess excellent practicality for its low cost. K 2 CO 3 -based adsorbent pellets produced by graphite-casting method are promising alkali metal-based solid CO 2 adsorbents. The incorporation of porous metal oxide supports is an effective to enhance CO 2 adsorption capacity of K 2 CO 3 -based adsorbent pellets. In this work, graphite-casted K 2 CO 3 -based adsorbent pellets incorporated with different porous supports (i.e., TiO 2 , ZrO 2 , and SiO 2) were prepared for CO 2 capture. Comparatively, the ZrO 2 -supported, K 2 CO 3 pellets loaded with 30 wt% of K 2 CO 3 exhibit the highest CO 2 adsorption capacity, approximately 0.93 mmol/g. For the SiO 2 -supported K 2 CO 3 adsorbent pellets, the high calcination temperature (>700 °C) required to remove the graphite layer covering the pellet surface will cause the formation of new eutectics (i.e., K 2 Si 2 O 5 and K 2 Si 4 O 9), which leads to the collapse of the adsorbent pellets. Low calcination temperature of 500 °C can avoid the collapse of the SiO 2 -supported K 2 CO 3 adsorbent pellets and remove most of the graphite on the surface. Moreover, the CO 2 adsorption capacity can be further increased to 1.30 mmol/g by adding 20 wt% of microcrystalline cellulose to the SiO 2 -supported K 2 CO 3 adsorbent pellet. Although the adsorption capacity of structurally improved, SiO 2 -supported K 2 CO 3 pellets is still inferior to that of structurally improved, ZrO 2 -supported K 2 CO 3 pellets, they exhibit great cost advantage. Therefore, SiO 2 -supported K 2 CO 3 pellets with 20 wt% of microcrystalline cellulose have industrial application prospects. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13835866
Volume :
306
Database :
Academic Search Index
Journal :
Separation & Purification Technology
Publication Type :
Academic Journal
Accession number :
160399068
Full Text :
https://doi.org/10.1016/j.seppur.2022.122608