Patent ID: 6403526
Filing Date: 2002-06-11
Classification: B01J,C01F,C01P,Y10T

Abstract:
Porous composite particles comprising an aluminum oxide component and at least one additive component residue of a crystal size growth inhibitor dispersed within the aluminum oxide component, wherein said composite particles have:(A) a specific surface area of at least about 80 m2/g; (B) an average nitrogen pore diameter of from about 60 to about 1,000 Angstroms; (C) a total nitrogen pore volume of from about 0.2 to about 2.5 cc/g; and (D) an average particle diameter of from about 1 to about 15 microns. â€ƒand wherein in said composite particles: (i) the alumina oxide component comprises at least 70 wt. % (a) crystalline boehmite having an average crystallite size of from about 20 to about 200 Angstroms; (b) gamma alumina derived from said crystalline boehmite; or (c) mixtures thereof; (ii) the additive component residue is derived from at least one ionic compound having a cation and an anion wherein the cation is selected from the group of ammonium, alkali metal cation, and alkaline earth metal cation and mixtures thereof and the anion is selected from the group of hydroxyl, silicate, phosphate, sulfate and mixtures thereof, and is present in the composite particles at an amount of from about 0.5 to about 10 wt. %, based on the combined weight of the aluminum oxide component, and additive component residue.