Preparation and Phase Transformation Behavior of Boehmite via Heat Treatment in Water Vapor

• 作 者: CHEN Bo XU Xisheng CHEN Xiaoming LU Xiancai
• 机 构: School of earth sciences and engineering,NJU,
• 出 处: 矿物学报
• 发表日期: 2013年S1期
• 关键词: Transformation vapour crystalline dissolution cube grains

Boehmite was prepared under heat treatment in water vapour, and the phase transformation of gibbsite heat-treated at various temperatures was investigated. The sample was characterized by scanning electron microscopy(SEM), X-ray diffraction (XRD), thermogravimetry and differential thermalanalysis (TG-DTA), fourier transform infrared (FTIR),and BET surface area.Effect of temperature on preparation was studied in the range of 155°–195°.With the increase in temperature, transformation of gibbsite into crystalline boehmites took place as indicated by the X-ray diffraction (XRD). The shape of the grains in the prepared sample was cube-like morphology.In water vapour gibbsite transform into boehmite by a dissolution - precipitation mechanism.

Boehmite was prepared under heat treatment in water vapor, and the phase transformation of gibbsite heat-treated at various temperatures was investigated. The sample was characterized by scanning electron microscopy (SEM), X- ray diffraction (XRD), thermogravimetry and differential thermalanalysis TG-DTA), fourier transform infrared (FTIR), and BET surface area. Effect of temperature on preparation was studied in the range of 155 ° -195 ° .With the increase in temperature, transformation of gibbsite into crystalline boehmites took place as indicated by the X-ray diffraction (XRD). The shape of the grains in the prepared sample was cube-like morphology. In water vapor gibbsite transform into boehmite by a dissolution - precipitation mechanism.