水滑石
锌
热液循环
水热合成
无机化学
化学
铝
材料科学
核化学
冶金
化学工程
催化作用
有机化学
工程类
作者
J. Theo Kloprogge,Leisel Hickey,Ray L. Frost
标识
DOI:10.1016/j.jssc.2004.07.010
摘要
Zn/Al hydrotalcites were synthesised by coprecipitation at increasing pH from 6.0 – 14.0, followed by hydrothermal treatment at 150 oC for 7 days. The materials were characterised by XRD, STEM, ICP-AES, thermal analysis, infrared spectroscopy and Raman spectroscopy. The XRD analysis for the samples prepared between pH 9.0 – 12.0 showed a pattern typical of hydrotalcite, with a c-axis distance of ~22.6 A. STEM showed that the pH of preparation affected the stability of the hydrotalcite and that instability, observed at pH 9.0, favoured the formation of mixed phases when treated hydrothermally. It was also shown that treatment of a stable starting material increased the crystallinity and resulted in the formation of hexagonal plate shaped particles. ICP-AES and thermal analysis showed that the Zn/Al ratio and thermal stability increased with pH. Thermal analysis showed three major weight losses corresponding to the loss of interparticle water, interlayer water and dehydroxylation of the hydroxide layers and decarbonisation of the interlayer region.
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