Evolution of high-energy electron beam irradiation effects on zeolite supported catalyst: Metal nanoprecipitation

Kai Song, Dana J. Sauter, Jinsong Wu, Vinayak P. Dravid, Peter C Stair

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The high-energy electron irradiation effects on Fe-loaded, zeolite-supported catalyst were examined by transmission electron microscopy. In the original sample under little beam irradiation, no nanoparticles larger than 1 nm can be observed, and about half of the loaded Fe is identified as being in a positive ion state (i.e., iron oxides). Metal Fe nanoparticles in neutral state Fe 0 were then found to precipitate quickly under beam illumination with an electron dose of ∼2.4 × 10 7 nm -2 or above at room temperature. Since electron microscopy is widely applied in the characterization of all sorts of catalysts supported on zeolites, the current observations could be treated as a model system to distinguish the metal nanoparticles existing in the original catalyst from those precipitated by electron beam irradiation. It was the ionization effect of electron radiation, other than temperature rise, that played an important role in the formation and growth of the metal precipitates. In the current system, the induced nanoprecipitations were identified as pure Fe metal clusters by electron energy loss spectroscopy (EELS), high-resolution transmission electron microscopy (HRTEM), and electron diffraction. As in current modeling system, although only metal Fe nanoparticles can be observed by EELS if the irradiation effect is ignored at the first place, the functional component in the loaded catalyst is actually a mixture of Fe-oxide and Fe.

Original languageEnglish
Pages (from-to)384-390
Number of pages7
JournalACS Catalysis
Volume2
Issue number3
DOIs
Publication statusPublished - Mar 2 2012

Fingerprint

Zeolites
Catalyst supports
Electron beams
Metals
Irradiation
Electron energy loss spectroscopy
Nanoparticles
Precipitates
Catalysts
Electron irradiation
Electrons
Metal nanoparticles
High resolution transmission electron microscopy
Iron oxides
Electron diffraction
Oxides
Electron microscopy
Dosimetry
Ionization
Lighting

Keywords

  • irradiation effects
  • Metal precipitation
  • transmission electron microscopy
  • Zeolite supported catalysis

ASJC Scopus subject areas

  • Catalysis

Cite this

Evolution of high-energy electron beam irradiation effects on zeolite supported catalyst : Metal nanoprecipitation. / Song, Kai; Sauter, Dana J.; Wu, Jinsong; Dravid, Vinayak P.; Stair, Peter C.

In: ACS Catalysis, Vol. 2, No. 3, 02.03.2012, p. 384-390.

Research output: Contribution to journalArticle

Song, Kai ; Sauter, Dana J. ; Wu, Jinsong ; Dravid, Vinayak P. ; Stair, Peter C. / Evolution of high-energy electron beam irradiation effects on zeolite supported catalyst : Metal nanoprecipitation. In: ACS Catalysis. 2012 ; Vol. 2, No. 3. pp. 384-390.
@article{6bb670194d3d4d768ae1b39604e58bb7,
title = "Evolution of high-energy electron beam irradiation effects on zeolite supported catalyst: Metal nanoprecipitation",
abstract = "The high-energy electron irradiation effects on Fe-loaded, zeolite-supported catalyst were examined by transmission electron microscopy. In the original sample under little beam irradiation, no nanoparticles larger than 1 nm can be observed, and about half of the loaded Fe is identified as being in a positive ion state (i.e., iron oxides). Metal Fe nanoparticles in neutral state Fe 0 were then found to precipitate quickly under beam illumination with an electron dose of ∼2.4 × 10 7 nm -2 or above at room temperature. Since electron microscopy is widely applied in the characterization of all sorts of catalysts supported on zeolites, the current observations could be treated as a model system to distinguish the metal nanoparticles existing in the original catalyst from those precipitated by electron beam irradiation. It was the ionization effect of electron radiation, other than temperature rise, that played an important role in the formation and growth of the metal precipitates. In the current system, the induced nanoprecipitations were identified as pure Fe metal clusters by electron energy loss spectroscopy (EELS), high-resolution transmission electron microscopy (HRTEM), and electron diffraction. As in current modeling system, although only metal Fe nanoparticles can be observed by EELS if the irradiation effect is ignored at the first place, the functional component in the loaded catalyst is actually a mixture of Fe-oxide and Fe.",
keywords = "irradiation effects, Metal precipitation, transmission electron microscopy, Zeolite supported catalysis",
author = "Kai Song and Sauter, {Dana J.} and Jinsong Wu and Dravid, {Vinayak P.} and Stair, {Peter C}",
year = "2012",
month = "3",
day = "2",
doi = "10.1021/cs300002c",
language = "English",
volume = "2",
pages = "384--390",
journal = "ACS Catalysis",
issn = "2155-5435",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Evolution of high-energy electron beam irradiation effects on zeolite supported catalyst

T2 - Metal nanoprecipitation

AU - Song, Kai

AU - Sauter, Dana J.

AU - Wu, Jinsong

AU - Dravid, Vinayak P.

AU - Stair, Peter C

PY - 2012/3/2

Y1 - 2012/3/2

N2 - The high-energy electron irradiation effects on Fe-loaded, zeolite-supported catalyst were examined by transmission electron microscopy. In the original sample under little beam irradiation, no nanoparticles larger than 1 nm can be observed, and about half of the loaded Fe is identified as being in a positive ion state (i.e., iron oxides). Metal Fe nanoparticles in neutral state Fe 0 were then found to precipitate quickly under beam illumination with an electron dose of ∼2.4 × 10 7 nm -2 or above at room temperature. Since electron microscopy is widely applied in the characterization of all sorts of catalysts supported on zeolites, the current observations could be treated as a model system to distinguish the metal nanoparticles existing in the original catalyst from those precipitated by electron beam irradiation. It was the ionization effect of electron radiation, other than temperature rise, that played an important role in the formation and growth of the metal precipitates. In the current system, the induced nanoprecipitations were identified as pure Fe metal clusters by electron energy loss spectroscopy (EELS), high-resolution transmission electron microscopy (HRTEM), and electron diffraction. As in current modeling system, although only metal Fe nanoparticles can be observed by EELS if the irradiation effect is ignored at the first place, the functional component in the loaded catalyst is actually a mixture of Fe-oxide and Fe.

AB - The high-energy electron irradiation effects on Fe-loaded, zeolite-supported catalyst were examined by transmission electron microscopy. In the original sample under little beam irradiation, no nanoparticles larger than 1 nm can be observed, and about half of the loaded Fe is identified as being in a positive ion state (i.e., iron oxides). Metal Fe nanoparticles in neutral state Fe 0 were then found to precipitate quickly under beam illumination with an electron dose of ∼2.4 × 10 7 nm -2 or above at room temperature. Since electron microscopy is widely applied in the characterization of all sorts of catalysts supported on zeolites, the current observations could be treated as a model system to distinguish the metal nanoparticles existing in the original catalyst from those precipitated by electron beam irradiation. It was the ionization effect of electron radiation, other than temperature rise, that played an important role in the formation and growth of the metal precipitates. In the current system, the induced nanoprecipitations were identified as pure Fe metal clusters by electron energy loss spectroscopy (EELS), high-resolution transmission electron microscopy (HRTEM), and electron diffraction. As in current modeling system, although only metal Fe nanoparticles can be observed by EELS if the irradiation effect is ignored at the first place, the functional component in the loaded catalyst is actually a mixture of Fe-oxide and Fe.

KW - irradiation effects

KW - Metal precipitation

KW - transmission electron microscopy

KW - Zeolite supported catalysis

UR - http://www.scopus.com/inward/record.url?scp=84863230457&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863230457&partnerID=8YFLogxK

U2 - 10.1021/cs300002c

DO - 10.1021/cs300002c

M3 - Article

AN - SCOPUS:84863230457

VL - 2

SP - 384

EP - 390

JO - ACS Catalysis

JF - ACS Catalysis

SN - 2155-5435

IS - 3

ER -