METHOD FOR MANUFACTURING OF SPHEROIDAL ALUMINA PARTICLES

摘要

The present invention concerns spheroidal alumina particles, catalysts comprising such particles as a support and a process for the production of spheroidal alumina particles, comprising the following steps:
a) preparing a suspension comprising water, an acid and at least one boehmite powder for which the ratio of the crystallite dimensions in the [020] and [120] directions obtained using the Scherrer X-ray diffraction formula is in the range 0.7 to 1;b) adding a pore-forming agent, a surfactant and optionally water, or an emulsion comprising at least one pore-forming agent, a surfactant and water to the suspension of step a);c) mixing the suspension obtained in step b);d) shaping the spheroidal particles by the oil-drop method using the suspension obtained in step c);e) drying the particles obtained in step d);f) calcining the particles obtained in step e).

主权项

1. Spheroidal alumina particles comprising a nitrogen adsorption isotherm volume, termed Vmeso, which is representative of the mesoporous volume, which is in the range 0.65 to 0.85 mL/g and a volume of pores with a diameter of less than 7 μm, termed Vmeso+macro, measured by mercury porosimetry, which is in the range 0.65 to 0.85 mL/g and for which the ratio Q=[(Vmeso+macro−Vmeso)/(Vmeso+macro)] is less than 10%, said particles comprising a mean diameter in the range 1.2 to 3 mm, a BET specific surface area in the range 150 to 300 m2/g and a settled packing density in the range 0.5 to 0.6 g/mL.