By using the self-prepared nano-TiO2as sulfur retention additive during combustion

thermogravimetric experiment on nano-TiO2catalyzing the CaCO3decomposition was performed.Moreover

the gas absorption liquid and solid products after desulfurization were analyzed by ion chromatography and infrared spectrum method

respectively.Furthermore

the Coats and Redfem model was employed to conduct calculation for the kinetic process of CaCO3decomposition.The results showed that

the nano-TiO2enhanced the CaCO3decomposition obviously

namely the reaction activation energy Edecreased with the reaction temperature;in the presence of nano-TiO2

the CaCO3crystal lattice was distorted and the crystal lattice energy decreased

improving the CaCO3decomposing to CaO with high reactivity;on the other hand

the nano-TiO2can accelerate the absorption rate of O2to speed up the reaction rate of coal particles around the additive

improve the SO2converting to SO3and promote the SO2dispersing into the inner CaO

at the same time

the complete combustion products can inhibit the CaSO3decomposition so as to improve the desulfurization effect.