Preparation of Mesoporous Nano-Alumina with Large Pore Volume and Pore Diameter by Azeotropic Distillation-Homogeneous Precipitation
Petrochemical Technology(2009)
摘要
Precursor of objective γ-Al2O3 was prepared from Al2(SO4)3 and NH4HCO3 by azeotropic distillation-homogeneous precipitation combined with ultrasonic dispersion.For precipitation of precursor,NH4HCO3 solution must be slowly added into Al2(SO4)3 solution in presence of appropriate amount of polyethylene glycol as dispersing agent.The water in wet precipitate was entrained by azeotropic distillation with butanol.The end product fibrous nano mesoporous γ-Al2O3 powder was obtained from the precursor after calcination at 600 ℃ for 4 h.The precursor and the end product were characterized by means of FTIR,TG,XRD,BET and SEM.The fibrous nano mesoporous γ-Al2O3 powder was uniform in particle size distribution with large pore volume,large pore size and high specific surface area.The pore diameter was 18.04 nm;pore volume was 1.87 mL/g;specific surface area was 370.11 m2/g,average particle diameter was 75 nm and average particle length was 300 nm.
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关键词
Azeotropic distillation-homogeneous precipitation,Mesoporous nano-alumina,Pore structure
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