Kinetics on Chlorination Process of La2O3 and CeO2 by Ammonium Chloride
氯化铵氯化氧化镧(铈)的反应过程及其动力学

Using ammonium chloride (NH4Cl) as a chlorinating agent, the effects of chlorinating temperature, time and NH4Cl dosage on chlorination of La2O3 and CeO2, and the thermal decomposition of LaCl37H2O and CeCl37H2O were examined. The results show that NH4Cl directly participates the chlorination reaction, and HCl from pyrolysis of NH4Cl also contributes to the chlorination reaction. CeCl3 and LaCl3 can cause gas phase hydrosols formation or oxidation reaction which generates LaOCl, CeOCl and CeO2. The apparent activation energies of La2O3 and CeO2 chlorination reactions, Ea, are 43.73 and 140.67 kJ/mol respectively. The process is mainly controlled by the interfacial chemical reaction.