초록 ▼

Spheroidal alumina particulates having bifold porosity are prepared by (i) intimately admixing, at a pH of less than about 7.5, (a) a sol of a member selected from the group consisting of ultrafine boehmite and pseudo-boehmite, said sol being devoid of amorphous alumina and the concentration by weig

Spheroidal alumina particulates having bifold porosity are prepared by (i) intimately admixing, at a pH of less than about 7.5, (a) a sol of a member selected from the group consisting of ultrafine boehmite and pseudo-boehmite, said sol being devoid of amorphous alumina and the concentration by weight thereof, in content by weight of Al2O3, being between 5 and 25%, with (b) from 30 to 95% by weight, based upon the total solids content of the admixture, of spheroidal alumina particulates essentially completely in at least one of the phases eta, gamma, delta and theta, such particulates having a micropore volume ranging from about 0.4 to 1 cm3/g, a specific surface ranging from about 100 to 350 m2/g, and particle diameters ranging from about 1 to 50 microns; (ii) prilling said intimate admixture into spheroidal particulates and gelling the same; and then, (iii) recovering, drying and calcining said gelled particulates at a temperature of from 550°to 1100°C. The resultant particulates having bifold porosity are useful as catalysts or catalyst supports.

대표청구항 ▼

Spheroidal alumina particulates having bifold porosity, and comprising a total pore volume ranging from about 0.55 to 1.7 cm3/g; a micropore volume ranging from about 0.5 to 1 cm3/g, with a micropore having a pore diameter of less than 0.06 microns; a macropore volume ranging from about 0.05 to 0.7

Spheroidal alumina particulates having bifold porosity, and comprising a total pore volume ranging from about 0.55 to 1.7 cm3/g; a micropore volume ranging from about 0.5 to 1 cm3/g, with a micropore having a pore diameter of less than 0.06 microns; a macropore volume ranging from about 0.05 to 0.7 cm3/g, with a macropore having a pore diameter of greater than 0.06 microns; a macropore mean diameter ranging from about 0.1 to 10 microns; a specific surface ranging from about 80 to 350 cm2/g; a breaking strength in excess of 1 kg; and the alumina comprising said spheroidal particulates being essentially completely in at least one of the phases eta, gamma, delta and theta.