抄録
Gibbsite, as-received as a precursor from a surface coating process, was used in this study as starting powder to study its phase transformation to gamma alumina. The powder was first washed, dried, ground and then calcined in an electric furnace at a controlled heating rate, to the holding temperature, held at temperature for a fixed time and cooled at a predetermined rate to produce a high surface area of the powder for use as a catalyst support. The results of this study have shown that the heating rate of calcination has affected and can be used to control the BET surface area of the powder. A faster heating rate for the calcination treatment can promote a higher surface area and porosity of the powder. XRD patterns and TEM micrographs have been used to show the phase transformation from gibbsite to gamma alumina.
