Synthesis and characterization of amorphous Al 2 O 3 and γ-Al 2 O 3 by spray pyrolysis

Green Processing and Synthesis

article

Zhenfeng Wang¹  Wenyuan Wu¹  Xue Bian¹  Yongfu Wu¹ 

[1] School of Materials and Metallurgy, Northeastern University

关键词: γ-Al2O3;    amorphous Al2O3;    modified lanthanum particles;    spray pyrolysis;   

DOI  :  10.1515/gps-2015-0128

来源: De Gruyter

【 摘 要 】

As an environmentally friendly method, spray pyrolysis has been widely used to produce a variety of metal oxides and composite metal oxides. Spray pyrolysis is used to synthesize amorphous Al 2 O 3 and γ-Al 2 O 3 . A pyrolysis temperature ranging from 1073 to 1273 K and a collector temperature ranging from 273 to 283 K result in amorphous Al 2 O 3 . To strengthen the stability of the amorphous Al 2 O 3 , La 3+ was added to modify amorphous Al 2 O 3 with different La 3+ concentrations. With a particle residence time of 2.6–3.0 s in the calciner, the pyrolysis temperature of γ-Al 2 O 3 was obtained at 1373 and 1273 K, respectively. Microstructural and morphological analyses conducted by using X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and infrared absorption spectrum showed that the obtained alumina are amorphous or γ crystalline forms flake.

【 授权许可】

CC BY