N-desorption or NH3 generation of TiO2-loaded Al-based nitrogen carrier during chemical looping ammonia generation technology.

As a terrific hydrogen carrier, NH 3 can be wildly used as non-carbon gas fuel in energy area, because NH 3 can store a high density of H 2 and can be liquefied easily in ambient temperature and pressure. Chemical Looping Ammonia Generation (CLAG) is known to be a novel, efficient and environmentally friendly synthesis method for ammonia, in which the N-sorption/desorption of nitrogen carrier are included. The N-sorption step, which is known as the carbothermal reduction, is well studied while there are few reports on N-desorption step. Therefore, in this paper, stationary bed reactor and thermo-gravimetric analyzer (TGA) were used to study the N-desorption performance of the TiO 2 -loaded Al-based N-carrier and the corresponding NH 3 generation during the N-desorption reaction. The results showed that, TiO 2 performed a good catalytic effect on the N-desorption reaction, which is due to the good dissociative adsorption performance of H 2 O on TiO 2 surface, and the released hydroxyl (OH ) plays an important role in the N-desorption reaction. The conversion amount of aluminum nitride and the yield of NH 3 increased with the TiO 2 loading in the reactants, the reaction temperatures and the steam concentrations in the atmosphere, while the conversion efficiency of NH 3 , which is significantly affected by temperature, didn't affected by the TiO 2 loadings. [ABSTRACT FROM AUTHOR]