Grafting preparation of AAO/SBA-15-SO3H(G): the preparation procedure was similar to that described the above and AAO/SBA-15 was obtained, then the sample was dried and calcined to remove the template in air at 540 8C for 6 h. In a typical grafting procedure,AAO/SBA-15 (1.0 g) and MPTMS (0.15 ml) were added into toluene (40.0 g), and the mixture was kept stirring for 24 h and filtered.