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

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/cm(3), 63.1%, 57.8 m(2)/g and similar to 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.