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Three – dimensional meso-porous Co 3 O 4  was prepared by nanocasting pathway based on the use of mesoporous silica (KIT-6) as hard template with different Cobalt concentrations (0.5–2.5 mol ratio based on mesoporous silica KIT-6). The prepared samples was used as supports for preparing V 2 O 5 /Co 3 O 4  (1, 6 wt% of V 2 O 5 ) catalysts. The prepared samples were characterized by different techniques. The catalytic activity of the prepared samples were evaluated in the complete oxidation reaction of  toluene ,  benzene , and/or  p-xylene ; (as model reactants of volatile organic compounds) in terms of CO 2 . The catalytic reaction was carried out in a fixed-bed micro-reactor operated under atmospheric pressure and within the reaction temperature range of 200–400 °C. The data confirmed that the three dimensional-mesoporous Co 3 O 4  (1.0 mole ratio) replicated sample possessed improved different parameters compared to those of the Co 3 O 4  sample with other mole ratios. The data reflected the yield of Co2 is decreased upon the increase in reaction temperature to 400°C. 1 wt.% V 2 O 5 /m-Co 3 O 4  catalyst shows a reverse direction, the CO 2  yield slowly increased in the range 150–250 °C, then jumped at 300 °C until maximum yield (100%) is observed at 400 °C. 1 wt.% V 2 O 5 /m-Co 3 O 4  catalyst was found to be the active and selective promised catalyst for the complete oxidation of either individual aromatic volatile organic compounds (benzene, toluene, and/or xylene) and/or their mixtures to 100% CO 2 .

Novel Vanadia/meso-Co 3 O 4 catalysts for the conversion of benzene–toluene–xylene to environmental friendly components via catalytic oxidation