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M. Gallastegi-Villa,A. Aranzabal,M.P. González-Marcos,B.A. Markaide-Aiastui,J.A. González-Marcos,J.R. González-Velasco 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
The effect of vanadia loading on the acidic and redox properties of VOx/TiO2 catalyst and their role in thesimultaneous reduction of NO with NH3 and oxidation of o-DCB is studied. Catalyst samples withdifferent proportions of VOx species, ranging from monomerics to V2O5 octahedral crystals have beenprepared. A relationship between VOx species and their acidic and redox properties was found. At lowtemperature, o-DCB is adsorbed mainly on Lewis sites, associated to monomeric species, but at hightemperature, o-DCB and NH3 compete for Brønsted sites associated to polymeric species.
Stewart, S. J.,Marco, J. F.,Crespo, P.,Romero, J. J.,Martí,nez, A.,Hernando, A.,Palomares, F. J.,Gonzá,lez, J. M. American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.11
<P>We report on the temperature dependencies of the Mössbauer spectra and the AC magnetic susceptibility measured in Cu-rich, FeMnCu samples prepared by mechanically alloying, using, on the one side, Cu and prealloyed FeMn powders and, on the other, pure element Cu, Mn, and Fe powders. From the correlation of the Mössbauer and susceptibility data we conclude about the basic characteristics of the phase distributions present in the different studied samples. Those distributions are a consequence of both the nanostructure induced upon milling and of the different signs of the Mn/Cu (negative) and Fe/Cu (positive) enthalpies of mixing. The proposed phase distributions are significantly different in the samples prepared from different precursors and this fact is analyzed in terms of the disproportion of the precursor FeMn alloy and in those of the favoured Mn/Cu interdiffusion and the hindered Fe/Cu one.</P>