Periodically ordered mesoporous magnesium oxides were synthesized by utilization of mesoporous CMK-3 carbon as exotemplate. The products exhibit high thermal stability and basic properties, which makes them promising for application in heterogeneous basic catalysis.
Periodically ordered mesoporous magnesium oxide was synthesized in a double replication procedure.
Mesoporous SBA-15 silica and CMK-3 carbon were successively used as hard structure matrixes. The
carbon pore system was infiltrated with Mg(NO3)2, which was then converted to MgO at 573 K; the
carbon matrix was finally removed by thermal combustion. The structure of the mesoporous MgO
corresponds to that of the original SBA-15 silica. The products consist of hexagonally arranged cylindrical
mesopores and crystalline pore walls. The efficiency of the replication series was studied by variation of
the infiltration method and comprehensive pore size analysis of all involved mesoporous materials. The
in situ formation of MgO inside the CMK-3 carbon pore system was monitored by thermal analysis.
Postsynthetic treatment of the products at 823 K in a vacuum prior to removal of the carbon matrix was
found to improve the crystallinity but to diminish the periodic order of the pore system.
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