Synthesis of ZSM-5@ ordered mesoporous silica composites by dodecylamine surfactant

Abstract

The core-shell structures of ZSM-5 coated with mesoporous silica were synthesized by means of dodecylamine (DDA) surfactant. The results show that the mesoporous silica shells are coated on ZSM-5 cores and result in the formation of hierarchical porous structures. The thickness of the coating shell can be controlled by changing the adding amount of TEOS. The core-shell composites with the thickness of 35 nm possess high surface areas (about 528 m²·g⁻¹), large pores (about 3.5 nm in diameter) on the silica shells. The composite molecular sieves display higher adsorption capacity for benzene (140.2 mg·g⁻¹) and butyraldehyde (213.7 mg·g⁻¹) than that of pristine ZSM-5 for benzene (99.2 mg·g⁻¹) and butyraldehyde (134.7 mg·g⁻¹). The composite molecular sieves show a wide application foreground for harmful gas adsorbent for environmental protection.

Keywords

core-shell / zeolite / adsorption / dodecylamine / butyraldehyde / benzene

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