کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1262120 | 971847 | 2013 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Thermally stable lanthanum-doped mesoporous alumina as a stable support for palladium in catalytic oxidation of C3H8 Thermally stable lanthanum-doped mesoporous alumina as a stable support for palladium in catalytic oxidation of C3H8](/preview/png/1262120.png)
High thermally stable mesoporous alumina doped with lanthanum was synthesized using inorganic nitrates as precursors and employing pluronic P123 (P123, (EO20PO70EO20, EO=ethylene oxide, PO=propylene oxide)) as a structure-directing agent. After calcination at 400 °C, the resultant lanthanum doped alumina exhibited a γ-Al2O3 phase, which was the same as pure alumina. After the thermal treatment up to 1200 °C, La-doped Al2O3 generated only one phase of θ-Al2O3 rather than two mixed phase of θ-Al2O3 and α-Al2O3 and the surface area could still maintain 101 m2/g with a keeping pore volume of 0.66 cm3/g. The excellent thermal stability was explained by the titration of strong Lewis acid sites of γ-Al2O3 with the assistance of highly dispersed lanthanum species covering on alumina. Furthermore, the lanthanum modified mesoporous alumina was preliminarily employed as a stable support for Pd in the catalytic oxidation of C3H8.
X-ray diffraction patterns of MA-T (a) and MA-La-T (b)Figure optionsDownload as PowerPoint slide
Journal: Journal of Rare Earths - Volume 31, Issue 11, November 2013, Pages 1081–1084