PREPARATION OF γ-Al2O3 BY CONTINOUS DIFFUSION METHOD

Abstract

. Aluminium hydroxide was prepared by acidic and basic diffusion methods. The g-Al₂O₃ was obtained when aluminium hydroxide was calcined in saturated steam at 550^oC for 4h. The average particle sizes of γ-Al₂O₃ were less than 50 nm and S_BET surface areas were from 233.3 to 336.4 m²/g and 127.7 - 263.7 m²/g for acidic diffusion method and basic diffusion method, respectively. γ-Al₂O₃ used as a carrier for the Ni catalyst for NO_x emission handle at temperature 350^oC. The results showed that γ -Al₂O₃ was prepared by both acidic and basic diffusion methods were obtained high transformation.  The highest activity is 67% (γ-Al₂O₃ was prepared by acidic diffusion method).