Synthesis of Three-Dimensionally Ordered Macroporous Co/SiO₂ Catalysts by Sol-Gel Method

Abstract:

A preparation of novel cobalt-based catalyst on three-dimensionally ordered macroporous (3DOM) silica supporter using poly (methyl methacrylate) monolith as a template has been studied. Monodispersed PMMA colloids were synthesized via an emulsion polymerization, resulting in PMMA spheres with the diameter of 390-400 nm. Two processes were employed for the 3DOM Co/SiO₂ catalyst fabrications, a single-stage sol-gel synthesis (SG) and incipient wetness impregnation method (IM) on synthesized 3DOM SiO₂. Both catalysts were characterized using X-ray Diffraction (XRD), X-ray Absorption Spectroscopy (XAS), Scanning Electron Microscope (SEM) and specific surface area analysis. The XRD and XAS results showed that the doped Co in the 3DOM Co/SiO₂ (SG) were the mix phase of Co(NO₃)₂ and Co₃O₄ , while, only Co₃O₄ was found in the 3DOM Co/SiO₂(IM). The SEM micrographs revealed that both catalysts feature periodic macroporous structure with mean pore diameter of 300-350 nm. Specific surface area of the 3DOM Co/SiO₂ (IM) and the 3DOM Co/SiO₂ (SG) catalysts are 195 m²/g and 286 m²/g, respectively.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 620-623
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.620
• Online since: January 2013
• Authors: Jittima Junsawat, Nichakan Phumthiean, Payoon Senthongkaew, Supakit Achiwawanich
• Keywords: Co/SiO₂ Catalyst, Fischer-Tropsch Synthesis (FTS), Incipient Wetness Impregnation Method, Sol-Gel Method, Three-Dimensionally Ordered Macroporous (3DOM)

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