Magnetic Vinylphenyl Boronic Acid Microparticles for Surface Catalytic Performance in Esterification of Propionic Acid with Methanol

Yıl 2016, Cilt: 17 Sayı: 5, 953 - 962, 20.12.2016

Ali Kara Beyhan Erdem

https://doi.org/10.18038/aubtda.279862

Öz

Magnetic vinylphenyl boronic acid microparticles, poly(ethylene glycol dimethacrylate-vinylphenyl boronic acid) [m-poly(EGDMA-VPBA)], produced by suspension polymerization, was found to be efficient solid acid catalyst for the esterification of methanol and propionic acid. Characterization techniques such as FT-IR, Elemental analyses, ICP-AES, ESR, SEM and N₂ sorption showed that both of Fe₃O₄ and H₂SO₄ are bonded to the polymer successfully. Esterification was studied for different molar percentages of H₂SO₄ at temperature range of 50-70 ^oC. The apparent activation energy was found to be 27.7 kj.mol^-1 for 10% H₂SO₄ doped m-poly(EGDMA-VPBA). Combining of strong acid H₂SO₄ with m-poly(EGDMA-VPBA), leads to materials with different functional properties. In addition, H₂SO₄ species could be introduced into the structure as acid centers, therefore this micro-dimensional catalyst has potential candidate for applications in the catalytic esterifications such as propionic acid with methanol.