Fixed and fluidized bed were compared with their reaction rate constant by the ammonium catalytic dissociation reaction. There was almost same reaction rate constant on both unit column fluidized reactor (5㎝φ) and scaled up fluidized reactor (10㎝ × 10㎝ × 60㎝) which is scaled up by inserting internal wall with hole into four compartments, but scaled up reactor without compartment shows lower value of its reaction rate constant than with compartment.