Abstract: Core-shell materials, as a kind of composite catalyst, are composed of core and shell, which show excellent synergistic effect and new characteristics. SiO₂ is an ideal shell material for developing core-shell catalysts because of its advantages such as non-toxicity, chemical inertness, optical transparency, simplicity of modification, and low cost. In this paper, the preparation methods of SiO₂ coated core-shell catalysts, including the sol-gel approach, template method, self-assembly process, and surface deposition method were introduced in detail. Besides, the applications of SiO₂ coated core-shell catalysts in heterogeneous catalysis, such as shape selective catalysis, reducing the loss of active components, preventing the aggregation of nanoparticles and sintering were discussed. The future development trend of core-shell catalysts coated with SiO₂ was pointed out.

Key words: core-shell catalyst, SiO₂ coated, preparation method, size selectivity, active component, sintering resistance