Super/Subcritical Fluid Extractions for Preparation of the Crystalline Titania

0341176 - ÚCHP 2011 RIV NL eng J - Journal Article
Matějová, Lenka - Cajthaml, Tomáš - Matěj, Z. - Benada, Oldřich - Klusoň, Petr - Šolcová, Olga
Super/Subcritical Fluid Extractions for Preparation of the Crystalline Titania.
Journal of Supercritical Fluids. Roč. 52, č. 2 (2010), s. 215-221. ISSN 0896-8446. E-ISSN 1872-8162
R&D Projects: GA ČR GP104/09/P290; GA ČR GA104/09/0694
Institutional research plan: CEZ:AV0Z40720504; CEZ:AV0Z50200510
Keywords : titania * supercritical fluid extraction * pressurised fluid extraction
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.986, year: 2010

Crystallinity, purity and texture of TiO2 powder in dependence on the treatment mode (purification) of an amorphous reaction semi-product (titania organogel) was studied. Standard calcination was compared with various extraction techniques using fluids in sub/supercritical state. The suitable combination of extraction solvents and extraction conditions (temperature and pressure) was judged to synthesize TiO2 powders crystalline phase (Anatase) with a high specific surface area and purity. The optimal results were achieved by combined extraction procedures - subcritical water extraction and supercritical fluid extraction or pressurised liquid extraction. Moreover the possible tuning of the TiO2 powder pore-size distribution by regulation of temperature at constant pressure for the combination of subcritical water extraction and pressurised liquid extraction was found.
Permanent Link: http://hdl.handle.net/11104/0184246