EMIL IOAN MURESAN*, VASILICA POPESCU, ION SANDU<br>Synthesis and Characterization of Hierarchical <br>Metallosilicate Macrospherical Catalysts

EMIL IOAN MURESAN*, VASILICA POPESCU, ION SANDU
Synthesis and Characterization of Hierarchical
Metallosilicate Macrospherical Catalysts

Abstract:

This work reports an original method for the obtaining of hard macrospherical metallosilicate catalysts. Due to their sizes and hardness these catalysts are easy to recover and to reuse. Porous metallosilicate macrospheres (0.9÷1.1 mm) that contain chromium (III) ions as main active catalytic centers were easily synthesized at room temperature using tetraethyl orthosilicate as silicon source and chitosan as template and shape generating agent. Three starting silicon/metals molar ratios and three chitosan/TEOS ratios were used for the synthesis of catalysts. The concentration of chitosan from the synthesis gel influenced the porosity, the size and the shape of catalyst particles. The synthesized catalysts were characterized by water sorption isotherms, FTIR spectroscopy, DR UV-vis and EDX analyses. Catalytic activity and the reusability of the catalyst were tested for the addition reaction of caprylic acid to epichlorohydrin. This new synthesis method of hard porous metallosilicate macrospheres encourages the replacement of homogeneous catalysts with their heterogeneous counterparts. Keywords: hard metallosilicate macrospheres, heterogeneous catalysis, hierarchical micro/meso/ macroporous materials

Issue: 2014, Volume 65, Issue 9

Pages:

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