摘要
Nanosized alumina powders were prepared from Al(NO3)3·9H2O and (NH4)2CO3 through the synthesis of ammonium aluminium carbonate hydroxide (AACH) and followed by calcination. TG DTA, XRD, TEM and BET were employed to study the process of AACH thermal decomposition and to characterize the products obtained. The results show that high purity (99.97%) and nanosized spherical α Al2O3 powders with the diameter of 40～50nm and BET surface area 32.5m2·g-1 can be obtained by calcining AACH at 1150℃for 1.5h, the sequence of phase transformation during calcination was AACH →amorphous Al2O3 →γ Al2O3 →α Al2O3, and the activation energy of AACH decomposition is (115±5)kJ·mol-1.
Nanosized alumina powders were prepared from Al(NO3)(3) . 9H(2)O and (NH4)(2)CO3 through the synthesis of ammonium aluminium carbonate hydroxide (AACH) and followed by calcination. TG-DTA, XRD, TEM and BET were employed to study the process of AACH thermal decomposition and to characterize the products obtained. The results show that high purity (99.97%) and nanosized spherical alpha-Al2O3 powders with the diameter of 40similar to50nm and BET surface area 32.5m(2) . g(-1) can be obtained by calcining AACH at 1150degreesC for 1.5h, the sequence of phase transformation during calcination was AACH --> amorphous Al2O3 --> gamma-Al2O3 --> alpha-Al2O3, and the activation energy of AACH decomposition is (115 +/- 5) kJ . mol(-1).
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2003年第6期650-654,共5页
Chinese Journal of Inorganic Chemistry
基金
河南省科技攻关项目(No.991090328)
河南省特种功能材料重点实验室资助课题(No.9928)。
