| http://www.w3.org/ns/prov#value | - The procedure used in Example 8 above was followed, except that the impregnating solution was an aqueous solution containing the correct amount of phosphotungstic acid (H3 PO4.12 WO3.xH2O, 76.6% W referred to as PTA), necessary for the desired C:W atom ratio loading (C:W mole ratios of 3.5:1, 10:1 and 20:1.) The resulting mixture was dried at 225??? C. in full vacuum for 18 hours during which the
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