Coking- and Sintering-Resistant Palladium Catalysts Achieved Through Atomic Layer Deposition

被引：751

作者：

Lu, Junling ^{[2
]}

Fu, Baosong ^{[3
]}

Kung, Mayfair C. ^{[4
]}

Xiao, Guomin ^{[3
]}

Elam, Jeffrey W. ^{[2
]}

Kung, Harold H. ^{[4
]}

Stair, Peter C. ^{[1
,5
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60201 USA

[2] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA

[3] Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Peoples R China

[4] Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL 60208 USA

[5] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

来源：

SCIENCE | 2012年 / 335卷 / 6073期

关键词：

OXIDATIVE DEHYDROGENATION; REFORMING CATALYSTS; DEACTIVATION; ETHANE; CONVERSION; VANADIUM; PROPANE; ALKANES; OXIDES;

D O I：

10.1126/science.1212906

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We showed that alumina (Al2O3) overcoating of supported metal nanoparticles (NPs) effectively reduced deactivation by coking and sintering in high-temperature applications of heterogeneous catalysts. We overcoated palladium NPs with 45 layers of alumina through an atomic layer deposition (ALD) process that alternated exposures of the catalysts to trimethylaluminum and water at 200 degrees C. When these catalysts were used for 1 hour in oxidative dehydrogenation of ethane to ethylene at 650 degrees C, they were found by thermogravimetric analysis to contain less than 6% of the coke formed on the uncoated catalysts. Scanning transmission electron microscopy showed no visible morphology changes after reaction at 675 degrees C for 28 hours. The yield of ethylene was improved on all ALD Al2O3 overcoated Pd catalysts.

引用

页码：1205 / 1208

页数：4

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