Preparation, characterisation and catalytic activity of CuZn-based manganites obtained from carbonate precursors

Combined steam reforming of methanol over Cu–Mn spinel oxide catalysts

“…Although the interpretation of XPS spectra of manganese oxides in terms of the actual Mn oxidation state is complex due to the slight differences of the corresponding binding energies of the main peaks, the peak at 642 eV (Fig. 6A) can be assigned to Mn 3+ and Mn 4+ cations, in agreement with previous reports [32][33][34][35][36][37][38]. A binding energy equal or higher than 642 eV reveals the presence of both cations; a slightly higher binding energy is observed when Mn 4+ alone is present [35,36].…”

“…6B) main peak located at ∼933.9 eV. In accordance with previous studies, this peak is assigned to Cu 2+ cations, because it is accompanied by a strong shake-up line at ∼942 eV [19,26,33,37,38,40]. The relative intensity of the satellite with respect to the main line was estimated to be in the range of 0.27 (x = 0.50)-0.83 (x = 0.10).…”

Fabrication of mesh-like bismuth oxide single crystalline nanoflakes and their visible light photocatalytic activity

“…The resultant oxide powders generally showed very fine crystallite size and aggregated to form mesopores or nanopores [25][26][27][28][29][30][31]. Recently, our group has developed an amino acid modified oxalate precursor way to fabricate mesoporous CeO 2 , Mn 2 O 3 , and MnO 2 with hierarchical nanoarchitecture [22][23][24][25][26][27][28][29][30][31][32][33][34]. The effect of amino acids on the formation of hierarchical structure of mesoporous CeO 2 and MnO 2 was examined.…”

Effect of preparation method on the surface properties and activity of Ni0.7Cu0.3Fe2O4 nanoparticles

“…8. For the calcined samples prepared by three different methods, the Cu 2p 3/2 spectrum exhibits a main peak in binding energy range 933-934 eV and a satellite peak at about 942 eV which are solely related to Cu 2+ cations [30][31][32]. Frost [33] has shown in perfectly defined materials, CuCl, Cu 2 O, CuCl 2 and CuO that the satellite peak only appears in the last two materials.…”