Resumo

PICASSO, Gino et al. Preparation of catalyst based on Ce-Pr for combustion of n-hexane. Rev. Soc. Quím. Perú [online]. 2014, vol.80, n.4, pp.270-278. ISSN 1810-634X.

Catalysts based on Ce-Pr mixed oxides, Ce_xPr_1-xO₂, were prepared by coprecipitation (x ranged from 0,1 to 0,9) for combustion of n-hexane. For comparison purposes, the pure simple oxides were also prepared. Catalysts were characterized by sorption of N₂ and X-ray diffraction (XRD). The analysis of adsorption isotherms of catalysts showed profiles of type IV, with specific surfaces ranging from 9,1 to 62,3 m²/g, with the prevalence of mesoporosity. The X-ray diffractogram patterns for pure and mixed oxide catalysts show the majority presence of stable fluorite phase. The introduction of Pr in mixed oxide composition maintains the crystal structure of fluorite-like type. The catalytic tests were carried out in a fixed bed reactor with a starting concentration of n-hexane of 2000 ppm and weight hourly space velocity (WHSV) of 80 h^-1. The total combustion temperatures for mixed oxides catalysts were in the range of 356 to 437 °C. The Ce_0.9Pr_0.1O₂ oxide showed higher specific rate (evaluated per hour, gram of catalyst considering the specific surface) than the other mixed oxides and pure simple oxides as a result of a higher value of surface area obtained.

Palavras-chave : mixed oxides; Ce-Pr; removal of n-hexane.

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