Ceria Catalyst Promoted with Al³⁺ and Acidified with PO₄^3- i) Synthesis and Surface Textural Properties

摘要

Phosphated ceria were prepared and promoted with different loading levels of aluminum (Al³⁺); 2, 5 and 10-wt% followed by calcination at 870 K for 3 h. These samples have been characterized by means of thermal gravimetric analysis (TGA), X-ray powder diffraction (XRD), Nitrogen adsorption at 77 K. TGA profiles show phosphated species with different thermal stability in the samples and addition of Al³⁺ causes an increase in the thermal stability of the surface phosphate species. The obtained results indicated that composites mainly cubic pattern of ceria (fluorite) structure and the addition of Al³⁺ and/or phosphate has no effect on the bulk structure of ceria but increases the crystallite size. Textural characteristics show that the phosphation and Al-promotion resulted in increased in the surface area. The pore size distribution exhibits a wide spectrum of mesoporosity in all samples.