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A novel egg-like nanosphere was designed as a long-lived catalyst and is described as Fe3O4@nSiO2-NH2-Fe2O3•xBi2O3@mSiO2. The catalyst was prepared using a modified Stöber method with template-free surface-protected etching. The catalyst particle consists of a magnetic Fe3O4 core as the “yolk”, an inner silica shell bearing active Fe2O3•xBi2O3 species as the “egg white”, and outer mesoporous silica...
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