COLL 83 |
| Gérard M. Pajonk Sr., LACE UMR 5634, LACE UMR 5634, University Lyon 1- 69650 Villeurbanne-France, Batiment Raulin, Villeurbanne, France |
| The sol-gel method is particurlarly well adapted in order to synthesize composite materials which can be mixed in a chemical way, intimately, at the scale of the reactant molecules. To begin with, molecular solutions are made to yield sols or colloidal dispersions (in the presence or absence of a catalyst) which further gel to give a kind of macroscopic polymer. Conventionnal drying leads to xerogels and ambigels solids. Due to its great flexibility, this synthesis method is advantageous to use in the preparation of supported metals in either mono-or bi-functional heterogeneous catalysis. The metal component can be dispersed either by cogelling its precursor with the support one, or impregnated onto the solid support. Commercially available inorganic or organic precursors solutions are commonly used. Amorphous materials are frequently obtained which can be used as such, or serve as catalyst precursors after appropriate treatments (calcination, reduction, oxydation etc...). |
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The Science and Engineering of Catalyst Preparation
2:00 PM-5:25 PM, Sunday, March 28, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |