Nanocomposite catalysts: Dendrimer encapsulated nanoparticles immobilized in sol-gel silica

Lindsey W. Beakley, Sarah E. Yost, Raymond Cheng, Bert D. Chandler

Research output: Contribution to journalArticlepeer-review

Abstract

A method for immobilizing dendrimer encapsulated nanoparticles (DENs) in a sol-gel silica matrix was developed. To evaluate timing effects for DEN addition to the sol-gel preparation, platinum DENs were added at two different times: (1) just before the condensation reactions were initialized, and (2) 24 h after initializing the condensation reactions after the sol formation but before solutions had gelled. After gellation, drying, and activation, the catalysts had similar activities for CO oxidation catalysis. The catalyst prepared after sols had formed, however, was substantially less active for toluene hydrogenation. Infrared spectroscopy of adsorbed CO indicated that this latter catalyst had fewer available surface sites and that both catalysts remained poisoned by dendrimer decomposition products after activation.

Original languageEnglish (US)
Pages (from-to)124-129
Number of pages6
JournalApplied Catalysis A: General
Volume292
Issue number1-2
DOIs
StatePublished - Sep 18 2005

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

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