alumina spheroidal particles of improved mechanical strength having a macroporous median diameter of between 0,05 and 30 micrometres

摘要

The present invention relates to spheroidal alumina particles characterized by a specific bet surface of between 150 and 300 m2 / g, an average particle diameter of between 1.2 and 3 mm, and a dispersion of particle diameters expressed by a deviation. not exceeding 0,1, a total porous volume measured by mercury porosimetry between 0,50 and 0,85 ml / g, a macroporosity rate in the middle of a particle of less than 30% and in which the dispersion of the macropore diameters expressed by the ratio of diameters d90 / d50 does not exceed 8. The invention also relates to the processes for preparing such particles as well as catalysts comprising such particles as a support and their use in catalytic hydrocarbon treatment processes, notably in a process of catalytic refining.