Bayerite Al(OH)3→γ-Al2O3相变的理化分析

IF 0.5 Q4 CHEMISTRY, MULTIDISCIPLINARY

Journal of Siberian Federal University. Chemistry Pub Date : 2021-12-01 DOI:10.17516/1998-2836-0260

N. V. Filatova, N. Kosenko, Artyom S. Artyushin

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引用次数: 0

摘要

用氨水沉淀法得到以拜耳石形式存在的氢氧化铝。通过电位滴定法确定了沉淀pH值。根据热分析、X射线衍射和红外分析数据，确定了bayerite在800℃以下的相变序列。通过对氮气吸附-解吸的研究，可以确定薄水铝石和γ- Al2O3的比表面积、体积和孔隙尺寸分别为135±2和238±10 m2/g;0.38和0.51 cm3/g;相对来说是1.7和3.8 nm。用非等温法(Avrami方程)求出薄水铝石→γ- Al2O3转变的有效活化能((136±5)kJ/mol)。

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The Physicochemical Analysis of Bayerite Al(OH)3 → γ-Al2O3 Transformation

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)

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来源期刊

Journal of Siberian Federal University. Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.10

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0.00%

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