Manuel F. Gomez

Selective oxidation of propane on MgO/γ‐Al2O3‐supported molybdenum catalyst: influence of promoters

The influence of promoters, potassium and samarium, on molybdenum supported over MgO–γ‐Al2O3 catalyst has been investigated in the oxidative dehydrogenation of propane. The acidities of catalysts were determined by temperature‐programmed desorption of NH3 and by decomposition of 2‐propanol. The K‐promoted catalyst showed the lower acidity followed by the Sm, whereas the unpromoted sample showed the highest acidity. The higher the acid character of the catalyst, the lower the selectivity to propene. Redox properties determined from EPR spectra change with the addition of the promoter. A parallelism between Mo6+ reducibility and catalytic activity was found.

Synergy effects in the oxidative dehydrogenation of propane over MgMoO4-MoO3 catalysts

Oxidative dehydrogenation of propane was studied over MgMoO4-MoO3 catalysts with a wt% of MoO3 varying from 0 to 100. The samples were characterized by XRD, EPR, DTA, laser Raman, and BET. The catalytic behavior of the mechanical mixtures was quite different from that of pure phases. These differences were discussed in terms of possible synergy effects between the phases. Propane conversion and selectivity to propene were closely related to the change in redox properties of the catalysts due to the appearance of Mo5+ ions.

Preparation and characterization of MgO-γ Al2O3 composite oxides

Abstract Studies of the chemical preparation, surface area, pore distribution, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and acid-base properties of magnesia–alumina composite oxides were carried out. The preparation method led to supports with high surface areas where Mg was homogeneously distributed upon the surface. The base properties of the composite oxides can be controlled by the Mg loading for an optimum catalyst performance.

Synthesis of 1,1-Diethoxyethane From Bioethanol. Influence of Catalyst Acidity

The reaction of isopropanol decomposition was carried out with the purpose of classifying, in terms of acidity, different catalysts used in the synthesis of 1,1- diethoxyethane. The 1,1-diethoxyethane production is clearly correlated with the acidity of the solids.

Oxidative Conversion of Propane over Al2O3-Supported Molybdenum and Chromium Oxides

Oxidative dehydrogenation of propane has been studied on Mo/γ-Al2O3 catalysts with 13 wt% of MoO3 and promoted with Cr. The catalysts were characterized by BET, X-ray diffraction, XPS, TPR, TPO and isopropanol decomposition. The ODH results indicated an important increase in propane conversion with Cr loading increase from 0 to 5 wt%. At 773 K the conversion increased 1.5 times whereas the selectivity to propene was not significantly modified. The higher activities obtained on Cr-doped catalysts provide for the technologically important possibility of carrying out the reaction at lower temperatures.