Surface and Textural Properties of Network-Modified Silica as a Function of Transition Metal Dopant Zirconium
作者： S. H. Teo , H. C. Zeng
DOI: 10.1021/JP010828N
关键词: X-ray photoelectron spectroscopy 、 Specific surface area 、 Oxide 、 Mesoporous material 、 Inorganic chemistry 、 Microporous material 、 Chemical engineering 、 Materials science 、 Zirconium 、 Crystallization 、 Dopant
摘要: Surface and textural properties of Zr-doped silica [xZrO2-(100 − x)SiO2] have been investigated as a function zirconium content in the range x = 5 to 50 (mol % Zr) via heating their respective xerogels (prepared with novel sol−gel route developed recently) air at 500 °C for 4 h. Nitrogen adsorption−desorption investigations (BET/BJH) on °C-heated samples show maximum specific surface area 484 m2g-1 20, minimum 105 50. With increase content, porosity can be tuned conveniently from mesoporous (100 A) microporous (≤ 20 region unimodal (or nearly unimodal) pore size distributions. Material issues such thermal reactions, oxide mixing level formation mechanisms also FTIR, XRD, DTA/TGA, XPS methods. It is found that networks significantly modified introduction zirconium, crystallization ZrO2 doped occurs only 903−95...
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