PREPARACIÓN DE CATALIZADORES BASADOS EN ÓXIDOS MIXTOS DE Ce-Mn POR COPRECIPITACIÓN PARA LA COMBUSTIÓN DE n-HEXANO

Catalysts based on Ce-Mn mixed with different Ce/Mn molar ratios ranging from 0,5 to 2 have been prepared by coprecipitation at pH constant with ageing times of 4, 18 and 24 h for combustion of n-hexane. XRD patterns of the mixed oxides showed the majority presence of fluorite phase. Specific BET surface areas of mixed oxides were always higher than their single counterparts and their adsorption isotherm depicted a mesoporous surface of Type IV. TPR thermograms confirmed the presence of mixed oxide phase, whose profile shifted to smaller temperatures with increasing content of ceria. Catalytic tests were performed with -1 2000 ppm of n-hexane and WHSV of 80 h in a fixed-bed reactor. For all samples, only CO 2 and water were observed at total conversion and no partial combustion products were