Abstract
γ-Al 2O 3-lanthanum supports (1, 10 and 20 wt.% La) were prepared by the impregnation of Boehmite with La(NO 3) 3·6H 2O. According to the lanthanum content, the BET area diminishes from 220 to 122 m 2/g. X-ray diffraction spectra showed γ-Al 2O 3 in the 1 wt.% La sample, while in the 10 and 20 wt.% La specimens, amorphous alumina was detected; the formation of lanthanum–aluminate or lanthanum oxide was not observed. RMN (Al 27RMN-MAS) spectra showed that the relative abundance of aluminum in tetrahedral symmetry stabilizes the γ-Al 2O 3 phase. FTIR-pyridine spectra show a diminution of Lewis acidity with the lanthanum content.
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