INORGANICCHEMICALSINDUSTRY ›› 2011, Vol. 43 ›› Issue (4): 18-.
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He Xiaokun,Liu Qinxi,Qin Qinggao,Guo Lü
Published:
Abstract: A series of modified alumina with different mass fractions (5%, 10%,20%,and 30%) of La/Ba were prepared by γ-Al2O3.All samples were calcined at 550,950,1 050,and 1 200 ℃ respectively.Pore structure of all samples were characterized by BET,pore volume, pore diameter,and XRD before and after aging.Influence of La/Ba doping contents on pore structure of modified Al2O3 was studied.Results of BET and XRD demonstrated that La/Ba can form large amount of aluminate structure to inhibit γ-Al2O3 phase tranfer at high temperature and is good for maintaining stability for both phase structure and pore structure of γ-Al2O3.Meanwhile,higher La/Ba content can decreased the surface area,pore volume,and pore diameter,and is not good for precious metals dispersing,especially at 1 200 ℃.Comprehensively considering pore structure and loss rate,2.5%La2.5%Ba/Al2O3 has the optimal surface activity and pore structure stability.
Key words: three-way catalyst, alumina, alkali metals, catalyst activity
CLC Number:
TQ133.1
HE Xiao-Kun, LIU Qin-Xi, QIN Qing-Gao, GUO Lü. Influence of La/Ba doping content on pore structure of alumina[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(4): 18-.
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