Thermally stable lanthanum-doped mesoporous alumina as a stable support for palladium in catalytic oxidation of C3H8
来源期刊：JOURNAL OF RARE EARTHS2013年第11期
论文作者：江莉龙 王玉玲 王秀云 罗永晋 曹彦宁 魏可镁
文章页码：1081 - 1084
摘 要：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 oC,the resultant lanthanum doped alumina exhibited a γ-Al2O3 phase,which was the same as pure alumina.After the thermal treatment up to 1200 oC,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 ofγ-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.
江莉龙，王玉玲，王秀云，罗永晋，曹彦宁，魏可镁
National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University
摘 要：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 oC,the resultant lanthanum doped alumina exhibited a γ-Al2O3 phase,which was the same as pure alumina.After the thermal treatment up to 1200 oC,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 ofγ-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.
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