Abstract
H2 and CO2 adsorption was investigated using pristine hydrogen titanate nanotube (HTNT) and nanorod (HTNR). HTNT and HTNR were modified with N-[3-(trimethoxysilyl)propyl]ethylene-diamine (TPEDA). Chemical linkage between an amine-containing organosilane and titanium on the surface of hydrogen titanate was confirmed with 29Si CP-MAS NMR spectrum. H2 and CO2 uptake on several hydrogen titanate samples was obtained by a TGA Q50 analyzer in flowing N2 gas of 40mL/min and CO2 gas of 60mL/min at 25°C and 1atm. Pristine HTNT sample showed the highest H2 uptake (i.e. ∼12.5mmol/g) on a TGA microbalance at 25°C whereas amine-modified HTNT sample exhibited the highest CO2 uptake (i.e. ∼1.2mmol/g) among all samples studied. CO2/N2 and H2/N2 selectivity for pristine and amine-modified HTNT samples was investigated by comparing the weight of the sample in flowing pure N2 gas of 100mL/min with above-mentioned mixed flows at 25°C. Reversibility for CO2 and H2 uptake showed good performance for 9 cycles.
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