Preparation and properties of the Al2O3–SiO2 aerogel/alumina framework composite

Abstract

Hierarchical structural composites were prepared by combining Al2O3–SiO2 aerogel with alumina frameworks. The alumina framework, which acted as matrix, was composed of interlocked hexagonal alumina platelets. The Al2O3–SiO2 aerogel was led into the matrix by vacuum impregnation method. The results of this research demonstrated that the introduction of Al2O3–SiO2 aerogel resulted in an increase of the specific surface area and of the compression strength. The volume density, apparent porosity, specific surface area and compression strength of the Al2O3–SiO2 aerogel/alumina framework composite were 1.29 g/cm3, 63.1%, 57.8 m2/g and ~21 MPa, respectively. The hierarchical porous structure and properties of the proposed composite material demonstrate its suitability for catalyst supporting applications at high reaction temperatures.