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Preparation and Characterization of Transitional Alumina Obtained through Ammonia Treatment
Author(s) -
Liu Yan,
Jia Litao,
Hou Bo,
Li Debao
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10582
Subject(s) - calcination , ammonia , aqueous solution , thermogravimetric analysis , materials science , hydrothermal circulation , chemical engineering , transmission electron microscopy , zeolite , ammonium carbonate , ammonium , characterization (materials science) , carbonate , mineralogy , inorganic chemistry , nuclear chemistry , chemistry , catalysis , nanotechnology , organic chemistry , metallurgy , engineering
γ‐ Al 2 O 3 and η‐ Al 2 O 3 were respectively obtained by precipitating aluminum nitrate and ammonium carbonate. For obtaining highly ordered pores, the obtained γ‐ Al 2 O 3 and η‐ Al 2 O 3 were treated in 50% (vol/vol) ammonia solution via low temperature immersing and high temperature hydrothermal treatment, respectively, then, the treated aluminas were calcined again. The crystal types, morphology, texture properties, and pore distribution of the original alumina, ammonia‐treated alumina, and the second calcined alumina were studied by characterizations of X‐ray diffraction, thermogravimetric analyses, nuclear magnetic resonance, BET , transmission electron microscopy, and so on. Several modified aluminas with specific morphology, desired pore structure, and pure crystal types were obtained, which can be used in some specific industrial application.