Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Super/Subcritical Fluid Extractions for Synthesis of Porous Metal Oxides
Matějová, Lenka ; Matěj, Z. ; Cajthaml, Tomáš ; Šolcová, Olga
In this study the influence of individual post-treatment steps on the crystallinity, purity and textural properties of prepared metal oxides - TiO2, ZrO2, TiO2-ZrO2 etc. in powdery form (aerogels) – has been studied. Titania and zirconia organogels were prepared as reaction semi-products of the sol-gel process controlled in reverse micellar solution of nonionic surfactant Triton X-114. in combination with a) subcritical fluid extractions (using water and subsequently methanol like pressurized solvents, SubWE/PFE) and b) calcination. The effect of various extraction conditions on textural and structural properties of metal oxides has been investigated. Besides that the reproducibility of these material properties has been also observed.
Colloidal Silica as an Efficient Binder for the Preparation of Al-SBA-15 Pellets
Topka, Pavel ; Karban, Jindřich ; Soukup, Karel ; Jirátová, Květa ; Šolcová, Olga
The objective of this contribution was to examine the possibility of using colloidal silica as a binder for the preparation of extrudates or pellets from mesoporous molecular sieves. Al- SBA-15 pellets with different content of colloidal silica were prepared and their textural properties and mechanical stability were investigated. The catalytic activity of the pellets in Friedel-Crafts alkylation of toluene with benzyl alcohol was directly compared to that of binder-free pellets and powder catalyst.

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