Raman and infrared spectroscopy provide complementary information about the nature of the surface metal oxide species present in supported metal oxide catalysts. This paper reviews the type of fundamental information that is typically obtained in Raman and IR characterization studies of supported metal oxide catalysts. The molecular structures of the surface metal oxide species are reflected in...

An isolate from polluted soil identified as Aspergillus sp. MS-100 was able to consume vanadium oxide octaethyl porphyrin as a model for protoporphyrins in crude oil. The isolate degrades about 55% of vanadium oxide octaethyl porphyrin (VOOEP) under optimum conditions during 7 days. The release of more than 0.96 mgl-1 of free vanadium into the aqueous phase was confirmed using atomic absorption...

The current investigation demonstrates that it is possible to molecularly design supported niobium oxide catalysts with the assistance of molecular characterization methods such as Raman spectroscopy. The formation and location of the surface niobium oxide species are controlled by the surface hydroxyl chemistry, and the surface niobium oxide species are located in the outermost layer of the ca...

We report the synthesis and characterization of new V2O5/Al2O3-MgO catalysts and their application in oxidative dehydrogenation and epoxidation reactions. The materials were prepared by wet impregnation under excess acid conditions. Anchoring of the desired species on the support occurs via an exchange reaction between the vanadium complex and surface hydroxyl groups. The IR and UV-Vis spectra ...

A series of V-MCM-41 samples was prepared with very long-range ordered structure, different pore sizes, and constant composition by applying a recently developed quantitative model [Y.H. Yang, S.Y. Lim, C. Wang, D. Harding, G.L. Haller, Micropor. Mesopor. Mater. 67 (2–3) (2004) 245–257]. Oxygen titration of catalysts pre-reduced with methanol vapor at the reaction temperature showed a constant ...

The effect of the irradiation with Al Ka X-rays during an XPS measurement upon the surface vanadium oxidation state of a fresh in vacuum cleaved V2O5(001) crystal was examined. Afterwards, the surface reduction of the V2O5(001) surface under Ar + bombardment was studied. The degree of reduction of the vanadium oxide was determined by means of a combined analysis of the O1s and V2p photoelectron...