Catalytic oxidation of volatile organic compounds (VOCs) has been studied with cryptomelane-type manganese
oxide octahedral molecular sieves (OMS-2) synthesized in buffer solutions. Characterization of OMS-2 has been done
using X-ray diffraction ( XRD), infrared (IR), thermogravimetric analysis–differential scanning calorimetry (TGA–
DSC), combined temperature programmed decomposition and mass spectrometry (TPD–MS), adsorption and
adsorbate IR techniques. OMS-2 was found to possess excellent hydrophobicity and strong affinity for VOCs.
Excellent activity and stability of OMS-2 in oxidation of VOCs at relatively low temperatures (100% conversion of
0.9% C6
H6 in air or 2.5% ethanol in air at 20 000 h−1 GHSV below 300°C) are due to these hydrophobic properties
and to facile evolution of lattice oxygen without destroying the structure (120–650°C ). © 2000 Elsevier Science B.V.
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