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Characterization of uniform, nanodispersed NOxstorage catalyst materials synthesized by successive ionic layer deposition

Authors
Journal
Catalysis Communications
1566-7367
Publisher
Elsevier
Publication Date
Volume
11
Issue
10
Identifiers
DOI: 10.1016/j.catcom.2010.03.019
Keywords
  • Noxstorage
  • Barium Oxide
  • Dispersion
  • Successive Ionic Layer Deposition (Sild)
  • Nanolayer

Abstract

Abstract A dispersed phase of barium oxide (BaO) supported on alumina has been shown to be primarily responsible for NO x storage in practical lean NO x trap catalysts. Conventional impregnation based catalyst loading techniques generate a mixture of dispersed and less active bulk-like BaO phases on alumina, with the bulk-like phase increasing as weight loading increases. Samples of equivalent BaO weight loading on fused alumina were prepared by successive ionic layer deposition (SILD) and wet impregnation. NO 2 temperature programmed desorption experiments demonstrate that SILD is uniquely capable of selectively synthesizing uniform, nanodispersed BaO rafts with high surface coverage. These nanodispersed SILD structures show remarkable thermal stability under high operating temperatures up to 650 °C.

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