Physicochemical studies on the TiO2-silica gel system

Mouśa, M. A.; Farid, T.; Omran, Z. A.; Allah, E. M. Dief

doi:10.1007/bf02546920

Cited by 1 publication

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“…They can be modified by incorporation of different metals in the form of elements, ions or oxides which can create or enlarge the activity inside the pores. The incorporation of ions of transition metals into the framework of such materials (especially titanium) gives additional special catalytic properties [3–11]. …”

Section: Introductionmentioning

confidence: 99%

Complex investigations of structural and thermal properties of silica-titania adsorbents

Skubiszewska–Zięba

Charmas

Лебода

et al. 2011

J Therm Anal Calorim

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Mesoporous titanium-containing silicas with different Titania contents were investigated. The structural parameters of the materials were characterized by low-temperature adsorption/desorption of nitrogen and X-ray diffraction analysis. The thermodesorption of water using the quasi-isothermal thermogravimetry as well as the differential scanning calorimetry were used to characterize thermal and surface properties of these materials. The adsorbed water layers and the concentration of weakly and strongly bound water as well as the surface free energy on the adsorbent/water interfaces were calculated. It was stated that the increase of Titania content causes a gradual decrease of specific surface area and formation of biporous structure inside the tested materials. The water thermodesorption from the surface proceeds in two or three stages, which is connected mainly with pore distribution and TiO2 content. One can observe the increase of the total surface free energy (ΔGΣ) with the increasing TiO2 content, but the largest ΔGΣ value at the adsorbent/strongly bound water interface is exhibited by the adsorbent of intermediate content (30%) of TiO2. Freezing temperature of water contained in the pores of the studied materials is connected largely with their porous structure. Due to the well developed porous structure, the water freezing process is a multi-stage one.

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Section: Introductionmentioning

confidence: 99%