| abstract |
A method and system for preparing an improved catalyst for the oxidation of alkanes or mixtures of alkanes and alkenes to the corresponding unsaturated carboxylic acids by gas phase catalytic oxidation. Mixing a compound containing a component of a catalyst with at least one solvent to form a precursor; extracting the precursor in a supercritical flow to form a treated precursor; Wherein the extraction step comprises drying the precursor, atomizing the precursor, and combinations thereof; calcining the treated precursor to form the catalyst: Including preparation methods. The method of the present invention introduces a precursor that has been pre-washed with an alcohol such as ethanol or methanol into the vessel and introduces the precursor into the vessel at a pressure and temperature that exceeds the critical point of the supercritical flow. Drying can be included. [Selection figure] None |