Deposition of SBA-15 layers on Fecralloy monoliths by washcoating

作者：Perez Hermicenda^*; Navarro Paloma; Montes Mario

来源：Chemical Engineering Journal, 2010, 158(2): 325-332.

DOI：10.1016/j.cej.2010.01.032

• SBA-15
• Slurry
• Viscosity
• SBA-15 Washcoating
• Metallic monoliths

Stable slurries or suspensions were prepared in order to carry out deposition of SBA-15 layers onto Fecralloy monoliths by washcoating. The suspensions presented an important evolution with ageing time under magnetic stirring, that consisted of a change in viscosity. This change was directly related to the abrasive effect of the magnetic stirring, and caused the breakdown of the big aggregates of the parent SBA-15 into rod-shaped units that became more and more irregular, and the slurries to become less viscous compared with the established usual trend. The viscosity was suitable for washcoating after 120 h of magnetic stirring. Although a clear macroscopic effect was observed, the mesoporous nature of the solid was preserved. The amount loaded and the adherence of the coatings depended on the formulation of the slurry. The best results were obtained when colloidal silica was used as a binder.

• 出版日期2010-4-1