Abstract: The correlations of the calcination temperature,crystal structure and catalytic activity of La_0.9Sr_0.1NiO₃ for ammoxidation have been studied.When the calcination temperature is above 1223K, the perovskite structure of La_0.9Sr_0.1NiO₃ is decomposed into three phases, i.e.La₂NiO₄, LaNiO₃, and NiO. The LaNiO₃ perovskite phase is the most active phase for ammoxidation.The catalyst calcinated at 1273K has the highest activity.

Key words: La_0.9Sr_0.1NiO₃, ammoxidation, structure-property relation