Catalysts based on supported 12-molybdophosphoric acid"

P. VÁZQUEZ; M. BLANCO; C. CÁCERES

CATALYSIS LETTERS

Kluwer Academic Publishers

Lugar: New York; Año: 1999 vol. 60 p. 205 - 215

1011-372X

Catalysts preparation by equilibrium adsorption of 12-molybdophosphoric acid in water-ethanol solutions onto silica, titania, carbon and alumina is studied. The solute/support interaction follows the decreasing order: alumina, carbon, silica and titania. It is observed that the molybdophosphoric acid keeps its Keggin-type structure after being supported at room temperature on all supports. This species is stable up to 500°C on silica, 400°C on titania or carbon and 250°C for alumina. The acidity of the supported heteropoly acid decreases in the following order: silica > titania > carbon > alumina.