Artículos
Título:
Synthesis and characterization of Cr/Cu/Mg mixed oxides obtained from hydrotalcite-type compounds and their application in the dehydrogenation of isoamylic alcohol
Autor/es:
MÓNICA E. CRIVELLO.; CELSO F. PEREZ; JULIO D. FERNANDEZ; GRISELDA A. EIMER; EDUARDO R. HERRERO; SANDRA G. CASUSCELLI; ENRIQUE RODRÍGUEZ-CASTELLÓN
Referencias:
Lugar: Amsterdam; Año: 2007 vol. 317 p. 11 - 11
Resumen:
p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-align: justify;">CrCuMg layered double hydroxides (LDH) with hydrotalcite-like structure containing different proportions of Mg2+, Cu2+ and Cr3+ cations have been prepared. Thermogravimetry and X-ray diffraction data indicate that the transformation of LDH into mixed oxides is effective after calcination at 450 °C. The effect of copper and magnesium for the dehydrogenation reaction of isoamyl alcohol has been examined and high conversions and selectivities to sovaleraldehyde were observed. Experimental data show that the copper is the active specie but the addition of magnesium improves the stability of the catalyst. An exhaustive analysis by XPS allowed us to analyze different copper species in the catalysts. So, Cu2+ was detected as CuO and as CuCr2O4 spinel-like in calcined samples, while Cu0 and Cu2+ were found in the