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Core‐shell structured CaO‐based pellets protected by mesoporous ceramics shells for high‐temperature CO 2 capture
Author(s) -
Sedghkerdar Mohammad Hashem,
Mahinpey Nader,
Soleimanisalim Amir H.,
Sun Zhenkun,
Chen Zhiwei,
Lim Jim,
Kaliaguine Serge
Publication year - 2016
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22626
Subject(s) - materials science , pellets , mesoporous material , sintering , thermogravimetric analysis , yttrium , porosity , ceramic , cubic zirconia , chemical engineering , shell (structure) , yttria stabilized zirconia , composite material , coating , metallurgy , oxide , chemistry , biochemistry , engineering , catalysis
In this study, a series of core‐shell structured spheriform CO 2 sorbents were synthesized by using CaO‐based pellets as cores and different mesoporous metal oxides (e.g. alumina, ceria, and yttrium‐stabilized zirconia) as shells through a repeated wet impregnation coating process. Cyclic CO 2 capture performance of the obtained sorbents was investigated using a thermogravimetric analyzer. Among all the core/shell sorbents under study, the pellets coated with a layer of alumina exhibit the best performance in the retention of CO 2 uptake over 20 cycles with the lowest activity loss of only 30.4 %, attributed to the existence of the thermal stable porous alumina shell which prevents the sintering and the aggregation of the CaO grains. Moreover, the attrition study using an air‐jet apparatus and a standard test method reveals that such sorbents exhibit enhanced attrition resistance due to the protection of the porous shell providing them with a great potential for application in fluidized bed conditions.