The article demonstrates the series of silicas produced from various alkoxysilanes introduced into the Amberlite® XAD7HP and lyophilized agar, whose transformation took place in the presence of ammonia vapors as catalyst. The silicas have been investigated by the means of the up-to-date analytical methods for the full characterisation of produced solids including positronium annihilation lifetime spectroscopy. The morphology of the silica is the result of the specific conditions applied for precursors transformation. Usage of lyophilized agar as a template for the vapor-phase method does not lead to creation of highly porous silica. The same applies to SiO2 materials produced without any template, with one except for tetrapropoxysilane. On the contrary Amberlite® XAD7HP is a very effective template. This polymer used as a template allows to obtain porous silica (specific surface area > 300 m2 g−1) in a form of microspheres from each of the employed precursors.