Abstract
Polyoxometalates prepared with W or Mo precursors, have been used together with H2O2 as homogeneous and heterogeneous catalysts for the adipic acid synthesis from cyclohexene. In this context, the K3PMo12O40, Cs3PMo12O40, K3PW12O40 and Cs3PW12O40 heteropolysalts were synthesized and calcined at 600 °C, characterized by XRD, acid-base titration, Raman Spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, SEM-EDX and evaluated in the cyclohexene oxidation to adipic acid. The XRD and FT-IR analyzes showed that the polyoxometalates structures were stable even after calcination at 600 °C. The thermogravimetric results showed that the heteropolysalts present superior thermal resistance compared to heteropolyacids. However, the acidities of the heteropolysalts are lower than the heteropolyacids. The K3PW12O40 catalyst presented the best performance in the catalytic tests (77% yield in adipic acid) associated with its higher total acid sites density. The catalytic performance of this recycled catalyst was evaluated and the yield in adipic acid was maintained.
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