Synthesis of alumina nanofibers
Synthesis of Pure Alumina Mesoporous Materials - …
is preferentially being deposited at the external surface, thus blocking the micropores. The effect of impregnation on the porous texture increases as the synthesis temperature decreases and results in the significant rise in the micropores contribution to the total porosity. Furthermore, the comparison of dried and fired samples reveals that the initial characteristics of porous texture are not considerably affected by thermal treatment. These results evidence the good thermal stability of titania–alumina support.
Synthesis of Alumina Nanowires and Nanotrees
The values of porous texture parameters are summarized in Table 1. It is found that the average width (d ) of slit-shaped pore is in good agreement with the mean size of micropores obtained from the intersection of the two straight lines of the t-plot. This result indicates clearly that the micropore are slit-shaped. Furthermore, it is of interest to note that the majority of parameters characteristic of porous texture increases by increasing the synthesis temperature or by decreasing the complexing ratio. As the more pronounced change in texture is induced by synthesis temperature, we have choice to study the effect of this experimental parameter on the catalytic activity of titania–alumina-supported molybdenum catalyst.