Interaction of pristine hydrotalcite-like layered double hydroxides with CO2: a thermogravimetric study

Metal oxides in general have surface acidic sites, but for exceptional circumstances, are not expected to mineralize CO 2 . Given their intrinsic basicity and an expandable interlayer gallery, the hydrotalcite-like layered double hydroxides (LDHs) are expected to be superior candidate materials for...

Full description

Saved in:
Bibliographic Details
Published in:Bulletin of materials science 2015-12, Vol.38 (7), p.1783-1790
Main Authors: MARAPPA, SHIVANNA, KAMATH, P VISHNU
Format: Article
Language:English
Subjects:
Acidic oxides
Aluminum
Ammonia
Basicity
Carbon dioxide
Chemistry and Materials Science
Decomposition
Decomposition reactions
Engineering
Gases
Hydroxides
Interlayers
Magnesium
Materials Science
Materials selection
Metal oxides
Mineralization
Nitrates
Temperature
Thermogravimetric analysis
Vapor phases
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Metal oxides in general have surface acidic sites, but for exceptional circumstances, are not expected to mineralize CO 2 . Given their intrinsic basicity and an expandable interlayer gallery, the hydrotalcite-like layered double hydroxides (LDHs) are expected to be superior candidate materials for CO 2 mineralization. However, the incorporation of Al 3+ adversely impacts the ability of the metal hydroxide layer to interact with CO 2 in the gas phase in comparison with the unitary Mg(OH) 2 . Thermogravimetric analysis shows that the decomposition reaction of the [Mg–Al–CO 3 ] LDH is only marginally delayed in flowing CO 2 in comparison with flowing N 2 , showing only an apparent marginal CO 2 uptake. Al 3+ ion severely attenuates the surface basicity of the LDHs, as the unitary Al(OH) 3 is acidic in comparison with Mg(OH) 2 and shows little or no interaction with CO 2 in the gas phase.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-015-1042-5