Surface modification by thermal oxidation of oxide dispersion strengthened (ODS) aluminium-containing high temperature alloys generally involves the formation of a dense and adherent alumina layer, which protects the underlying matrix against further degradation in aggressive environments at high temperatures.
The isothermal oxidation behaviour of novel oxide dispersion strengthened (ODS) FeAlCr intermetallic alloys was investigated at 900 and 1100 °C for up to about 150 h, with special emphasis on the oxidation kinetics, scale morphology and scale adherence.
Emission tests confirmed the increasing deactivation of the field-aged catalysts and measurements of CO oxidation, Pt dispersion and hydrocarbon storage capacity were used together with XPS, TEM, and SEM EDS to compare the performance with lab-aged catalysts.
High quality GOx nanosheets were prepared by a slight modification of a synthesis reported by D. C. Marcano et al. to increase the oxidation and dispersion in aqueous solutions.
It was shown that the type of precursors used for Mn impregnation influenced the dispersion, oxidation state, and oxygen mobility of the impregnated Mn.
This result is explained by the melt dispersion oxidation mechanism that operates for rapid heating only.
These catalysts were studied using Fourier Transform Infrared Spectroscopy (FTIR) to determine Rh oxidation state and dispersion.
In particular, the role played by the surface functional groups in determining the loading, dispersion, oxidation state and stability of the metal phases is addressed.
The hydrophobic layers formed on the surface of copper nanoparticles can protect the particles against oxidation and improve dispersion stability of oil-based nanofluids [10 12], which are important for exploiting the potential benefits and applications of the enhanced thermal properties of the nanofluids.
The oxidation states and dispersion of silver supported on alumina and faujasite were monitored by TEM, TPR and in situ UV visible spectroscopy along the steps of thermal dehydration, then oxidation and finally reduction of the freshly prepared materials.
