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A commercial lanthanum oxide was modified into X%-La2O3 samples via partial dissolution and regrowth of crystallites, wherein the X value denotes the weight percent of the initial metal oxide powder dissolved by nitric acid. BET measurements and TEM observations indicate that the 20%-La2O3 sample has an increased specific surface area, relatively thin and small crystallites in size. TPD/TPR profiles also show that the 20%-La2O3 sample has more surface active oxygen than the 0%-La2O3 sample. Among the four X%-La2O3 samples, the highest activity for methane oxidation was obtained over the 20%-La2O3 sample. Therefore, the present work proves that the method of partial dissolution and regrowth of crystallites are effective to modify surface property of lanthanum oxide.
A commercial lanthanum oxide was modified into X% - La2O3 samples via partial dissolution and regrowth of crystallites, wherein the X value represents the weight percent of the initial metal oxide powder dissolved by nitric acid. BET measurements and TEM shows that that 20% La2O3 sample has an increased specific surface area, relatively thin and small crystallites in size. TPD / TPR profiles also show that the 20% -La2O3 sample has more surface active oxygen than the 0% La2O3 sample. Among the four X% -La2O3 samples, the highest activity for methane oxidation was obtained over the 20% -La2O3 sample. Thus, the present work proves that the method of partial dissolution and regrowth of crystallites are effective to modify the surface property of lanthanum oxide.