C02 Capture From Flue Gases of Coal Fired Plant Using Hydrotalcite Alumina Adsorbent
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Date
2012
Authors
Mohd Roslee Othman
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Abstract
Hydrotalcite (HT) was synthesized following combustion-recrystallization-impregnation
procedure. The highest adsorption capacity observed was 1.21 mmol/g at operating
temperature of 300°C and 0.4 bar of C02 partial pressure in the presence of N2. During
adsorption-desorption study, it was shown that the removal and recovery of carbon
dioxide at high temperature could be enhanced significantly in wet condition. This was
further vindicated by the heat of adsorption that was higher in wet condition than dry
condition. The breakthrough capacity measured at 300°C was the highest when the
amount of water vapor was in the range of 25-27.5%, 27.5-30% and 30-32.5% (v/v) for
carbon dioxide concentration in the feed maintained at 10%, 20% and 30% (v/v),
respectively. Higher concentration of water vapor than these threshold amounts reduced
the overall removal and recovery at all adsorbate concentration. The HT adsorbent could
be reused for multiple times with relatively small loss of activity in wet condition. The
measured loss of capacity was only 6.7% after 50 cycles of adsorption-desorption
operation.