Journal of Siberian Federal University. Chemistry: The Physicochemical Analysis of Bayerite Al(OH)3 → γ-Al2O3 Transformation

Journal of Siberian Federal University. Chemistry / The Physicochemical Analysis of Bayerite Al(OH)3 → γ-Al2O3 Transformation

Issue: Journal of Siberian Federal University. Chemistry. 2021 14 (4)
Authors: Filatova, Natalya V.; Kosenko, Nadezhda F.; Artyushin, Artyom S.
Contact information: Filatova, Natalya V.: Ivanovo State University of Chemistry and Technology Ivanovo, Russain Federation; ; Kosenko, Nadezhda F.: Ivanovo State University of Chemistry and Technology Ivanovo, Russain Federation; Artyushin, Artyom S.: Ivanovo State University of Chemistry and Technology Ivanovo, Russain Federation
Keywords: boehmite, γ- Al2O3; bayerite; thermolysis; dehydration kinetics; Avrami equation; activation energy; thermal analysis; diffractograms; γ-Al2O3
Abstract: It was obtained aluminum hydroxide in the form of bayerite by precipitation with ammonia. The precipitation pH was found by the potentiometric titration. Based on the data of thermal, X‑ray diffraction and IR‑analysis it was identified the sequence of bayerite transitions up to 800 °C. The study of nitrogen adsorption- desorption allowed to determine a specific surface, a volume, and dimensions of pores for boehmite and γ- Al2O3 as 135±2 and 238±10 m2/g; 0.38 and 0.51 cm3/g; 1.7 and 3.8 nm, relatively. The value of effective activation energy for boehmite →γ- Al2O3 transition ((136±5) kJ/mol) was found by means of non- isothermal method (by Avrami equation)
Pages: 527–538
DOI: 10.17516/1998-2836-0260
Paper at repository of SibFU: https://elib.sfu-kras.ru/handle/2311/145060