Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1645329 | Materials Letters | 2013 | 4 Pages |
•A series of Co-MCM-41 with different cobalt contents were synthesized.•The addition of ascorbic acid makes the mesoporous structure become more regular.•More cobalt atoms were incorporated in the framework of MCM-41.•The catalytic activity in the hydroxylation of benzene was improved more efficiently.
A series of Co-MCM-41 with different cobalt contents were synthesized with ascorbic acid as auxiliary by direct hydrothermal synthesis, in which surprising promotion effect of the ascorbic acid on the long-range ordering of mesoporous structure and its crucial contribution to the catalytic activity were validated. Without the assistance of ascorbic acid, we were unable to synthesize the Co-MCM-41 mesoporous silica with Co/Si molar ratio greater than 0.15, while it is possible for us to obtain sample with Co/Si molar ratio up to 0.30 and more cobalt atoms anchored in the framework of Co-MCM-41 with the assistance of ascorbic acid. Meanwhile, its catalytic activity in the direct hydroxylation of benzene with hydroperoxide as oxidant was highly improved.