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A series of La2O3-modified SiO2 denoted as xLa2O3-SiO2 (x = 5, 10, 15, 30), where x means the amount of La2O3 (wt%) added in SiO2, were prepared by impregnation of a commercial spherical SiO2 into an aqueous solution of lanthanum nitrate. The precursor supports were dried at 110 ¡ãC overnight, and calcined at 700 ¡ãC for 4 h.
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