Amorphous refractory composition
AssigneeMobil Oil Corporation
InventorsArthur W. Chester, Garry W. Kirker
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Abstract
This invention relates to a new and useful amorphous, solid, combination refractory composition and to its synthesis. The new composition is an x-ray amorphous rare earth aluminum phosphorus oxide having high surface area and unique pore size distribution. The composition is useful as a catalyst support and provides improvement over prior art supports such as alumina or aluminum phosphate for certain catalytic applications.
Claims21
A refractory composition comprising an amorphous, solid, combination of rare earth oxide, aluminum oxide and aluminum phosphate characterized after calcination by a surface area of from about 50 m.sup.2 /g to about 500 m.sup.2 /g, a pore volume of from about 0.3 cc/g to about 1.5 cc/g, and Equilibrium Sorption capacities of greater than about 10 wt.% for the water vapor, greater than about 6 wt.% for cyclohexane vapor and greater than about 5 wt.% for n-hexane vapor, said rare earth oxide, aluminum oxide and aluminum phosphate being present in the combination refractory composition, by weight, at from about 10:20:70 to about 90:5:5.
A method for synthesizing a refractory composition comprising an amorphous, solid, combination of rare earth oxide, aluminum oxide and aluminum phosphate characterized after calcination by a surface area of from about 50 m.sup.2 /g to about 500 m.sup.2 /g, a pore volume of from about 0.3 cc/g to about 1.5 cc/g, and Equilibrium Sorption capacities of greater than about 10 wt.% for the water vapor, greater than about 6 wt.% for cyclohexane vapor and greater than about 5wt.% for n-hexane vapor, said rare earth oxide, aluminum oxide and aluminum phosphate being present in the combination refractory composition, by weight, at from about 10:20:70 to about 90:5:5, which comprises
- (i) preparing a first solution comprising a source of aluminum, a source of rare earth metal and phosphoric acid, said sources of aluminum and rare earth metal dissolved in suitable polar solvent medium, said phosphoric acid in solution with water, the composition of said first solution being from about 0.1 to about 10 wt.% aluminum, from about 0.1 to about 10 wt. % rare earth metal and from about 0.2 to about 5 wt.% phosphorus,
- (ii) preparing a second solution comprising a basic solution of pH from about 10 to about 14,
- (iii) mixing said first and second solutions together with agitation while maintaining the pH at from about 8 to about 12, and
- (iv) recovering the precipitate formed during said mixing step.
Dependencies are inferred from the claim text.