Open AccessHigh performance CaO-based sorbents for pre- and post- combustion CO2 capture at high temperature
Author(s) -
Saima Sultana Kazi,
Asunción Aranda,
Julien Meyer,
Johann Mastin
Publication year - 2014
Publication title -
energy procedia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.474
H-Index - 81
ISSN - 1876-6102
DOI - 10.1016/j.egypro.2014.11.240
Subject(s) - sorbent , calcination , carbonation , materials science , chemical engineering , thermogravimetric analysis , gravimetric analysis , sorption , scanning electron microscope , chemistry , adsorption , composite material , catalysis , organic chemistry , engineering
Synthetic CO 2 sorbent materials of CaO/Ca 12 Al 14 O 33 of different compositions were prepared using a simple hydrothermal method and low-cost hydroxides starting precursors. The products were characterized by X-ray diffraction, scanning electron microscopy, BET analysis and crushing tests. Sorption kinetics and chemical stability during carbonation/ calcination multi- cycling in pre- and post-combustion conditions were investigated by thermo gravimetric analysis. Long-term stability of the hydrothermally prepared sorbents is attributed to the formation of a stable frame of mayenite (Ca 12 Al 14 O 33 ) which reduces the sintering of the active CaO phase. Among all sorbents, the one with composition 27/73 wt % CaO/Ca 12 Al 14 O 33 is considered a promising CO 2 sorbent with stable capture capacity (21g-CO 2 /100 g sorbent) in severe calcination conditions and high mechanical strength.
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