Characterization of Titania/Silica Gel by Means of Low-Pressure Nitrogen Adsorption

✍ Scribed by V.M. Gun'ko; F. Villiéras; R. Leboda; M. Marciniak; B. Charmas; J. Skubiszewska-Ziȩba

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 217 KB
• Volume: 230
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2000.7047

✦ Synopsis

Adsorbents synthesized by grafting of titania onto mesoporous silica gel surfaces at different temperatures were studied by means of nitrogen adsorption-desorption and water desorption. The pore size distribution f (R p ) of titania/silica gel depends on the titania concentration (C TiO 2 ) and the temperature of titania synthesis. Nonuniformity of TiO 2 phase is maximal at a low C TiO 2 value (3.2 wt.% anatase deposited at 473 K), and two peaks of the fractal dimension distribution f (D) are observed at such a concentration of titania, but at larger C TiO 2 values, only one f (D) peak is seen. More ordered filling of pores and adsorption sites by nitrogen, reflecting in the shape of adsorption energy distributions f (E) at different pressures of adsorbate, is observed for adsorbent with titania (rutile + anatase) grafted on silica gel at a higher temperature (673 K).