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| - Synthesis of Hierarchically Structured Aluminas under ControlledHydrodynamic Conditions
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| Abstract
| - Aluminas having hierarchical bimodal pore structures with regular arrayed macropores interconnectedwith mesopores were synthesized in a cone/plate apparatus that provided well-defined hydrodynamicconditions. A parametric synthesis study was performed to better understand the synthesis conditionsrequired to form the hierarchical structures. The synthesis experiments demonstrated that the hierarchnicalstructure could only be formed under limited mixing conditions. The mesoporous structure, which wascreated by interstitial porosity between boehmite nanoparticles, was formed independently of themacropores and was not significantly impacted by the use of a surfactant, whereas the formation of themacropores required the presence of an alkoxide droplet within the synthesis mixture and the surfactantplayed no role other than to influence the hydrodynamic conditions during synthesis.
- Hierarchically structured aluminas having bimodal pore structures were synthesized in a cone/plate apparatus. A parametric synthesis study was performed to better understand the conditions required to form the hierarchical structures as well as to provide insight into the formation mechanism.
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