Morphology of titania coatings on silica gel

摘要: Control of the hydrolysis and condensation soluble precursors titanium is shown to yield oxide coatings well-defined morphology. A ``smooth'' coating, consisting patches titania on silica, causes only a small increase in surface area, from 130 m2/g for uncoated silica gel 154 m2/g. On other hand, ``rough'' which consists 3 nm diameter particles dispersed over surface, results an BET area 350 The specific was determined via isopropanol dehydration activity found be comparable indicating that phase responsible area. Small angle X-ray scattering (SAXS) transmission electron microscopy (TEM) provide definitive evidence coating morphology while photoelectron spectroscopy (XPS) used determine dispersion titania. supported maintains its upon calcination at temperatures up 873 K unsupported looses much Also demonstrated this work novel preparation method using bis-ammonium lactato dihydroxide (TALH), water precursor.