Phospha-alumina gel and method of preparation
AssigneeNalco Chemical Company
InventorMonica E. Choca
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Abstract
A novel phospha-alumina gel having a large average pore diameter and a characteristic pore volume distribution is prepared by co-precipitation of aluminum and phosphorus compounds. The gel is then dried, formed and calcined to give a material having a large average pore diameter of at least 100 A and a characteristic pore volume distribution with a minimum number of small pores, such that less than 30% of the total pore volume is in pores smaller than 100 A in diameter. Such material is especially useful as a catalyst or as a catalyst support.
Claims15
A catalyst or catalyst support composition consisting essentially of a phospha-alumina which, when dried, formed and calcined has the following properties, where pore volume distributions are determined by nitrogen adsorption and mercury intrusion (a) large average pore diameter greater than 100 A, and (b) minimal small pores, less than 30% of the total pore volume being in pores smaller than 100 A in diameter, said phospha-alumina being obtained by preparing an acidic aqueous solution of at least one water soluble inorganic aluminum salt and at least one water soluble inorganic salt of an acid of phosphorus, adding an alkaline aqueous solution of a water soluble inorganic aluminate in sufficient amount to produce an alkaline pH and to form a coagulated precipitate, separating said precipitate from the residual solution and drying said precipitate in the form of discrete particles.
A process of preparing a phospha-alumina in discrete particle form which comprises preparing an acidic aqueous solution of at least one water soluble inorganic aluminum salt and at least one water soluble inorganic salt of an acid of phosphorus, adding an alkaline aqueous solution of a water soluble inorganic aluminate in sufficient amount to produce an alkaline pH and to form a coagulated precipitate, separating said precipitate from the residual solution and drying said precipitate in the form of discrete particles, which when calcined have an average pore diameter of at least 100 A and a characteristic pore volume distribution with a minimal number of small pores such that less than 30% of the total pore volume is in pores smaller than 100A in diameter.
Dependencies are inferred from the claim text.