A novel method for incorporation of heteroatoms into the framework of ordered mesoporous silica materials synthesized in strong acidic media

Heteroatoms of Al and Ti are effectively introduced into the framework of o rdered mesoporous silica materials (designated as MAS-7 and MTS-9, respecti vely) in strong acidic media (pH < 0) by a two-step procedure. MAS-7 shows high catalytic activities for the cracking of both small (cumene) and bulky (1,3,5-triisopropylbenzene) molecules because it combines the advantages o f both zeolites (strong acidity) and mesoporous materials (large pores). In contrast, Al-SBA-15 samples prepared from both "post-synthesis" and "direc t synthesis" present much lower catalytic activities than MAS-7. Furthermor e, MTS-9 exhibits very high catalytic activity in phenol hydroxylation by H 2O2, giving the phenol conversion of 26%, comparable to TS-1.