478254 Self-Supporting Monoliths from Hollow Core-Shell Ni@SiO2 Nanostructures
In the present work, we present results from an investigation into forming such self-supporting monolithic structures from hollow Ni@SiO2 core-shell catalysts. The aim of the study is the formation of monoliths from Ni@SiO2 without the aid of sacrificial chemicals (such as binders) or support structures, and, ultimately, to control the meso- and macroporosity of the resulting monolith while maintaining a minimum mechanical stability. Towards this goal, several different approaches were tested based on a cross-linking of the oxide shells with and without additional silica reinforcement. The resulting monoliths were characterized via SEM and TEM and tested for their rupture strength. Based on the results, we developed an optimized protocol to form stable, self-supporting monoliths from Ni@SiO2 core-shell materials. Since the procedure is based on cross-linking the silica matrix, it is expected to be transferrable to other hollow and non-hollow metal@SiO2 systems. We are currently evaluating these structures in catalytic experiments, comparing the monolith against a conventional catalytic fixed-bed.
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