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

Research output: Contribution to journalArticle

421 Citations (Scopus)

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 languageEnglish
Pages (from-to)1205-1208
Number of pages4
JournalScience
Volume335
Issue number6073
DOIs
Publication statusPublished - Mar 9 2012

    Fingerprint

ASJC Scopus subject areas

  • General

Cite this