Total catalytic oxidation of toluene using Pd impregnated on hierarchically porous Nb2O5 and Ta2O5 supports

A series of supported Pd catalysts were elaborated using hierarchically porous Nb2O5 and Ta2O5 materials, synthesised with and without a non-ionic surfactant. The deposition of Pd nanoparticles was achieved using the wet impregnation method on calcined supports. The catalytic systems were pre-reduced in hydrogen and investigated for their efficiency in the total oxidation of toluene and found to have increased activity in comparison to a series of reference catalysts based on hierarchically porous TiO2 and ZrO2, with minimal benzene formation. Results have shown how activities are dependent on the support material, synthesis conditions and chemical composition.

Pd impregnated hierarchically porous Nb2O5 and Ta2O5 materials have been used in the catalytic oxidation of toluene. Results have shown an evident improvement in the T50% in comparison to hierarchical titania and zirconia materials synthesised in a similar fashion.Figure optionsDownload high-quality image (191 K)Download as PowerPoint slideHighlights
► Synthesis of hierarchically porous niobium and tantalum oxides.
► Spontaneous self-formation of oxides from alkoxides.
► Pd nanoparticles supported on hierarchically porous Nb2O5 and Ta2O5 supports.
► Metal oxide-catalyst effect influenced by morphology and chemical composition of support.
► Reduction in T50% in the total oxidation of toluene, cf. similar TiO2–ZrO2 supports.