(NH4)6MnMo9O32 as oxydesulfurization catalyst

Abstract

In the present work, the heteropolymolybdate (NH4)6MnMo9O32 containing Mn(II) as heteroatom was synthesized. The microcrystalline precipitate was characterized by XRD, FTIR, Raman spectroscopy, and SEM-EDS. Although the SEM-EDS results showed a surface enrichment of Mo, the expected structure was verified by FTIR and Raman spectroscopy. According to its chemical and structural properties, the MnMo9 system was evaluated as "bulk" in the clean oxidation of diphenyl sulfide (DPS) and dibenzothiophene (DBT) with H2O2 at 80ºC. The results showed high reactivity, with 100% conversion of both DPS and DBT in short reaction times and good selectivity to the corresponding sulfones. Compared to other HPOMs, this species showed higher activity and selectivity to sulfone in DBT.