Abstract
The Mo Al 2O 3 catalysts at various molybdenum loading was prepared by adding (CH 3COCHC(O-)CH 3) 2MoO 2 (Moacac), dissolved in ethanol, to the boehmite alumina sol driven from aluminum isopropoxide (AIP). The structural evolution of Mo Al 2O 3 gel was investigated by using 27Al nuclear magnetic resonance (NMR) spectroscopy and X-ray diffractometry (XRD). 27Al NMR of Mo Al 2O 3 has been compared with that of pure alumina. The addition of molybdenum species to alumina sol was to have no effect on the alumina structure when the molybdenum loading was lower than 20%. No incorporation of molybdenum species to alumina lattice was observed and the finely dispersed MoS 2 crystallite on the support was obtained upon sulfidation. However, an Al 2(MoO 4) 3 phase, which was an indication of the interaction between Al 2O 3 and MoO 3, was formed on the alumina surface when molybdenum loading was higher than 20%. All molybdenum species were accessible by reactant molecules regardless of molybdenum loading.
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