A series of porous titanium oxides
was synthesized using different
alkylamines and modified by amines, including diethylenetriamine (DETA),
triethylenetetramine (TETA), and tetraethylenepentamine (TEPA), for
CO2 capture. These new composite CO2 sorbents
were characterized by powder X-ray diffraction, transmission electron
microscopy, nitrogen adsorption, Fourier transform infrared spectroscopy,
and thermogravimetric analysis. Their CO2 capture performances
were evaluated in a fixed-bed reactor equipped with online mass spectroscopy.
Experimental results revealed that CO2 uptake capacities
of the titania composite sorbents increase with amine loading but
decrease with the size of impregnated amines. The highest CO2 sorption capacity achieved with the sorbents is 2.64 mmol/g. It
is also found that, besides the surface area and pore volume, the
pore size of the support also plays an important role in determining
the CO2 uptake capacity of the composite sorbents. In addition
to their high CO2 adsorption capacities, the amine-impregnated
titanias exhibit good stability and regenerability.
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