Crystalline titanium containing silica analog of ZSM-48 (TS-48) sample
s were synthesized using soluble peroxytitanate, fumed silica and diam
ino octane. All samples were characterized using a variety of techniqu
es including XRD, IR, AAS, SEM, UV-Vis, XANES and catalytic testing in
hydroxylation of phenol. Data suggest that titanium in these material
s is linked to the framework. However, it was impossible to incorporat
e more than about 2 wt% Ti in the zeolite lattice. TS-48 samples prepa
red by this method had no activity for hydroxylation of phenol in the
presence of hydrogen peroxide. The lack of activity of this material e
ven though it showed all of the regular characteristics of other catal
ytically active titanium silicalites (i.e., TS-1 and TS-2) could be du
e either to diffusional limitations or to subtle differences ir. titan
ium environment.