Iron-oxide-modified nanosized diamond: Preparation, characterization, and catalytic properties in methanol decomposition

Nanosized diamond (UDD), obtained by a detonation procedure, was modified with iron from the corresponding acetylacetonate precursor under various pretreatment conditions. Nitrogen physisorption, X-ray diffraction, temperature-programmed reduction, and FTIR and Mössbauer spectroscopy were used for their characterization. The samples' catalytic behavior in methanol decomposition was also studied. The physicochemical and catalytic properties of the obtained materials (Fe/UDD) were compared with those of other iron-oxide-modified mesoporous supports with different nature and functionality (MCM-48 silica and CMK-1 carbon). The highest catalytic activity and stability was achieved with air-pretreated Fe/UDD.

The state of iron oxide nanoparticles on various supports is determined by both the surface properties (nature and functionality) and the pore structure of the support, the former factor probably being of primary importance. The combined unique properties of nanosize iron oxide particles with nanosize diamond support lead to the formation of highly active and stable catalysts for methanol decomposition.Figure optionsDownload as PowerPoint slide