Two-dimensional Thermal-stable Catalytic System : Encapsulation of Nanocatalysts in Mesoporous Silica Nanosheets Through Graphene Oxides-mediated Strategy

Herein, two-dimensional (2D) sandwich-like structures in which noble metal or metal oxide nanocatalysts were encapsulated in two layers mesoporous silica oxide (mSiO2@M(MO)@mSiO2) nanosheets were synthesized by using graphene oxide as sacrificial template. As a model catalyst, Pt nanocatalysts encaged in mesoporous silica sheets can be stable under the calcination temperature as high as 650 o C. Moreover, the length of mesoporous transfer channel of these catalysts can be reduced to several ten nanometres, and this two-side mesoporous structure provides more channels access to the Pt core. Therefore, it exhibits higher catalytic activity for hydrogenation of 4-NP compared with one-side mesoporous structure catalyst (such as SiO2@Pt@mSiO2 sphere). These results suggest that these 2D mSiO2@M(MO)@mSiO2 nanosheets are robust nanocatalytic systems with high activity, thermal and cycling stability and have great potential applications in catalytic reactions.