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High CO 2 Storage Capacity in Alkali‐Promoted Hydrotalcite‐Based Material: In Situ Detection of Reversible Formation of Magnesium Carbonate
Author(s) -
Walspurger Stéphane,
Cobden Paul D.,
Safonova Olga V.,
Wu Yinghai,
Anthony Edward J.
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201000687
Subject(s) - carbonation , hydrotalcite , magnesium , carbonate , partial pressure , alkali metal , oxide , materials science , inorganic chemistry , chemical engineering , phase (matter) , chemistry , catalysis , metallurgy , oxygen , organic chemistry , engineering
Alkali‐promoted hydrotalcite‐based materials showed very high CO 2 storage capacity, exceeding 15 mmol g −1 when the carbonation reaction was carried out at relatively high temperature (300–500 °C) and high partial pressure of steam and CO 2 . In situ XRD experiments have allowed correlation of high CO 2 capacity to the transformation of magnesium oxide centres into magnesium carbonate in alkali‐promoted hydrotalcite‐based material. Moreover, it has been clearly shown that crystalline magnesium carbonate may be reversibly formed at temperatures above 300 °C in the presence of sufficient partial pressure of steam in the gas phase, conditions that are prevalent in pre‐combustion CO 2 capture. The role of steam appears to be of utmost importance for the formation of the bulk carbonate phase and for its reversibility. It is proposed that a high partial pressure of steam keeps the magnesium oxide periclase phase sufficiently hydroxylated to allow magnesium carbonate formation if a relatively high partial pressure CO 2 is present in the gas phase.