Coking- and sintering-resistant palladium catalysts achieved through atomic layer deposition

Junling Lu; Baosong Fu; Mayfair C. Kung; Guomin Xiao; Jeffrey W. Elam; Harold H. Kung; Peter C. Stair

doi:10.1126/science.1212906

Coking- and sintering-resistant palladium catalysts achieved through atomic layer deposition

Junling Lu, Baosong Fu, Mayfair C. Kung, Guomin Xiao, Jeffrey W. Elam, Harold H. Kung, Peter C. Stair^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

678 Scopus citations

Abstract

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°C. When these catalysts were used for 1 hour in oxidative dehydrogenation of ethane to ethylene at 650°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°C for 28 hours. The yield of ethylene was improved on all ALD Al₂O₃ overcoated Pd catalysts.

Original language	English (US)
Pages (from-to)	1205-1208
Number of pages	4
Journal	Science
Volume	335
Issue number	6073
DOIs	https://doi.org/10.1126/science.1212906
State	Published - Mar 9 2012

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title = "Coking- and sintering-resistant palladium catalysts achieved through atomic layer deposition",

abstract = "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°C. When these catalysts were used for 1 hour in oxidative dehydrogenation of ethane to ethylene at 650°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°C for 28 hours. The yield of ethylene was improved on all ALD Al2O3 overcoated Pd catalysts.",

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T1 - Coking- and sintering-resistant palladium catalysts achieved through atomic layer deposition

AU - Lu, Junling

AU - Fu, Baosong

AU - Kung, Mayfair C.

AU - Xiao, Guomin

AU - Elam, Jeffrey W.

AU - Kung, Harold H.

AU - Stair, Peter C.

PY - 2012/3/9

Y1 - 2012/3/9

N2 - 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°C. When these catalysts were used for 1 hour in oxidative dehydrogenation of ethane to ethylene at 650°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°C for 28 hours. The yield of ethylene was improved on all ALD Al2O3 overcoated Pd catalysts.

AB - 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°C. When these catalysts were used for 1 hour in oxidative dehydrogenation of ethane to ethylene at 650°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°C for 28 hours. The yield of ethylene was improved on all ALD Al2O3 overcoated Pd catalysts.

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Coking- and sintering-resistant palladium catalysts achieved through atomic layer deposition

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