In-situ X-ray absorption study of ceria-supported Pd-Cu nanoparticles for oxygen-enhanced water gas shift

Junichiro Kugai, Jeffrey T. Miller, Elise B. Fox, Chunshan Song

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The detailed structures of bimetallic Pd-Cu on various CeO2 and Al2O3 supports were investigated by X-ray absorption technique in-situ in hydrogen and WGS conditions. No indication of the neighboring Pd atoms in both Pd-K edge and Cu-K edge EXAFS fittings showed that Pd is highly dispersed in the lattice of metallic Cu. The Cu-Cu bond distance was markedly shortened by alloying with Pd and correlated to decrease of coordination number, which reflects particle size. A higher coordination number for Pd-Cu than that for Cu-Cu on Al2O3 support suggested that Pd is in the interior of the nanoparticles on Al2O3 while these coordination numbers were close on CeO2 support indicating a uniform distribution of Pd and Cu atoms. The CO shift activity was not simply correlated to the Cu-Cu bond distance or particle size, but the high activity of Pd-Cu/CeO2 was attributed to surface Pd interacting with Cu on CeO2 surface.

Original languageEnglish (US)
Pages (from-to)67-73
Number of pages7
JournalApplied Catalysis A: General
Volume528
DOIs
StatePublished - Nov 25 2016

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Water gas shift
Cerium compounds
X ray absorption
Particle size
Oxygen
Nanoparticles
Atoms
Carbon Monoxide
Alloying
Hydrogen

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "In-situ X-ray absorption study of ceria-supported Pd-Cu nanoparticles for oxygen-enhanced water gas shift",
abstract = "The detailed structures of bimetallic Pd-Cu on various CeO2 and Al2O3 supports were investigated by X-ray absorption technique in-situ in hydrogen and WGS conditions. No indication of the neighboring Pd atoms in both Pd-K edge and Cu-K edge EXAFS fittings showed that Pd is highly dispersed in the lattice of metallic Cu. The Cu-Cu bond distance was markedly shortened by alloying with Pd and correlated to decrease of coordination number, which reflects particle size. A higher coordination number for Pd-Cu than that for Cu-Cu on Al2O3 support suggested that Pd is in the interior of the nanoparticles on Al2O3 while these coordination numbers were close on CeO2 support indicating a uniform distribution of Pd and Cu atoms. The CO shift activity was not simply correlated to the Cu-Cu bond distance or particle size, but the high activity of Pd-Cu/CeO2 was attributed to surface Pd interacting with Cu on CeO2 surface.",
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In-situ X-ray absorption study of ceria-supported Pd-Cu nanoparticles for oxygen-enhanced water gas shift. / Kugai, Junichiro; Miller, Jeffrey T.; Fox, Elise B.; Song, Chunshan.

In: Applied Catalysis A: General, Vol. 528, 25.11.2016, p. 67-73.

Research output: Contribution to journalArticle

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T1 - In-situ X-ray absorption study of ceria-supported Pd-Cu nanoparticles for oxygen-enhanced water gas shift

AU - Kugai, Junichiro

AU - Miller, Jeffrey T.

AU - Fox, Elise B.

AU - Song, Chunshan

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AB - The detailed structures of bimetallic Pd-Cu on various CeO2 and Al2O3 supports were investigated by X-ray absorption technique in-situ in hydrogen and WGS conditions. No indication of the neighboring Pd atoms in both Pd-K edge and Cu-K edge EXAFS fittings showed that Pd is highly dispersed in the lattice of metallic Cu. The Cu-Cu bond distance was markedly shortened by alloying with Pd and correlated to decrease of coordination number, which reflects particle size. A higher coordination number for Pd-Cu than that for Cu-Cu on Al2O3 support suggested that Pd is in the interior of the nanoparticles on Al2O3 while these coordination numbers were close on CeO2 support indicating a uniform distribution of Pd and Cu atoms. The CO shift activity was not simply correlated to the Cu-Cu bond distance or particle size, but the high activity of Pd-Cu/CeO2 was attributed to surface Pd interacting with Cu on CeO2 surface.

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