Effects of hydrophilic/lipophilic nanoparticles on the decomposition of NH4HCO3 solution

Aqueous ammonia is a potential absorbent for post-combustion carbon capture. Desorption of carbon dioxide (CO 2 ) from ammonium bicarbonate (NH 4 HCO 3 ) solution is one of key reactions of regeneration of the absorbent. Experimental studies on decomposition of NH 4 HCO 3 solution with and without nano-TiO 2 at different temperatures were conducted. Additions of nano-TiO 2 into ammonium bicarbonate solutions decrease the apparent activation energy of overall decomposition reaction and accelerate the decomposition of ammonium bicarbonate solutions. Moreover, compared to hydrophilic nano-TiO 2 , hydrophilic lipophilic nano-TiO 2 exerts more significant promoting effects on the decomposition reaction.