Nature of the active sites in Ni/MgAl2O4-based catalysts designed for steam reforming of ethanol

Mixed spinel-type Ni-Co-Mn oxides: synthesis, structure and catalytic properties

“…sample. This is consistent with the literature data, which confirm that catalysts containing both Ni and Co are more active and provide a higher hydrogen yield than only Cocontaining catalysts [29,30]. Ratios of the integral amount of oxygen and hydrogen atoms in products of TPR are 1.2:6, и 1.3:6 for Co 1.8 At the same time, the ratios of carbon and hydrogen atoms in products (about 0.6:3 in both cases) are lower than in the molecule of ethanol (1:3).…”

Ni/CeO2–Al2O3 catalysts for the dry reforming of methane: The effect of CeAlO3 content and nickel crystallite size on catalytic activity and coke resistance

“…The small peak observed at higher BE values (nearly 916 eV BE), that is not observed in pure CeAlO 3 reference samples [34], is the 3d 3/2 spin orbit component associated to the higher BE 3d 5/2 peak (in purple in Fig. 2b) and can be associated to the presence of Ce 4+ ions [44]. By estimating the intensity percent of this peak, it was possible to compare Ce 4+ amounts in the calcined and reduced samples.…”

“…Ce3d spectra were extremely complicated, due to the different components arising by Ce 3+ and Ce 4+ ions and by Ni2p 1/2 satellites superimposed to the first peaks. By following a peak-fitting procedure, five spin orbit pairs related to Ce3d were individuated, and the resulting components were associated to different ions by comparison with literature data [34,44]. The small peak observed at higher BE values (nearly 916 eV BE), that is not observed in pure CeAlO 3 reference samples [34], is the 3d 3/2 spin orbit component associated to the higher BE 3d 5/2 peak (in purple in Fig.…”

Influence of structural parameters on the reaction of low temperature ethanol steam reforming over Pt/Al2O3 catalysts

“…The latter bands along with those at ca. 1386 and 1417 cm −1 (symmetric ı s (CH 3 ) and asymmetric ı as (CH 3 ) deformation vibration in ethoxy species) as well as the weak peak at ca 1108 cm −1 ( (CO) vibration of monodentate ethoxy species) provide evidence for the formation of ethoxide species on the catalyst surface originating from the dissociative adsorption of ethanol [8,54,[58][59][60]. The latter species are mostly adsorbed on the Al 2 O 3 surface.…”