Fissuring and Fragmentation Removal During Sol-Gel Catalytic Materials Synthesis: An Experimental Design Approach
Résumé
Statistical designs were used to investigate the effects of various processing conditions on the fissuring and/or fragmentation of sol-gel catalytic materials. Three types of sol-gel materials were studied: SiO 2 , TiO 2-doped SiO 2 and CeO 2-doped SiO 2. Five processing variables were investigated: the quantity of water included in the sol-gel preparation, the amount of TiO 2 or CeO 2 precursors, the mixing time, the gelation time and the influence of treatment in an oven at 40 • C prior to the heating treatment (pre-heating time). Processing variables were set at high and low limits in three different 2 4 full-factorial designs. As notable results, the water content appeared to be a critical processing variable in every studied factorial designs. Pre-heating time was also significant for SiO 2 gels. Finally the amount of CeO 2 precursor and the gelation time were found to be influential for the synthesis of non-cracked CeO 2-doped SiO 2 sol-gel monoliths.
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