Effect of surface area, pore volume and particle size of P25 titania on the transformation of anatase to rutile

Abstract

The effect of calcination on P25 at different temperatures titania has been studied by XRD, nitrogen adsorption-desorption isotherm, BET-surface area, pore volume, pore size, particle size and crystallite size in order to understand the conversion of anatase to rutile. The fraction of anatase and rutile washas been determined using XRD. Although the crystallinity remains the same, the phase change of anatase to rutile was is inevitable with temperature. The isotherms essentially showed the non-porous characteristics of the P25 samples. In addition, the nitrogen adsoption by the samples decreased appreciably lowered with crystallinity. The pore volume and BET- surface area showed a radical large decrease at 900 oC. The particle size, crystallite size, and pore size showed an increasing trend with increase in temperature. The aAnalysis of the physical characteristics indicated that P25 titania samples can be used for catalytic applications at less than 500 oC.