Fluoride-Induced Reduction of CTAB Template Amount for the Formation of MCM-48 Mesoporous Molecular Sieve

High Resolution Image Download MS PowerPoint Slide The addition of an appropriate amount of F - reduced the CTAB surfactant amount dramatically for the synthesis of an MCM-48 mesoporous molecular sieve. The CTAB/Si ratio was decreased gradually by increasing the F/Si ratio, which was even decreased to 0.1 when the F/Si ratio reached 1.0. The sample obtained at such a low CTAB/Si ratio was hydrothermally stable in boiling water for 24 h. Therefore, the addition of F - can not only achieve the purpose of decreasing the CTAB amount but also endow the MCM-48 material with hydrothermal stability. However, other assistants such as SO 4 2-, NO 3 -, and Cl - cannot reduce the CTAB/Si ratio as effectively as F - .