The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition

H. Vuori (Corresponding Author), Antti Pasanen, M. Lindblad, M. V. Niemelä, A. O. I. Krause

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Alumina, silica and beta zeolite supported iridium catalysts were prepared by atomic layer deposition (ALD) from two different metal precursors, Ir(acac)3 and Ir(thd)(COD). The use of Ir(thd)(COD) in ALD is reported for the first time. The aim was to investigate the effect of the precursor on catalyst surface species, chemical state and characteristics. Controllable ALD reaction was successful with both iridium precursors on alumina and with Ir(acac)3 on β zeolite. On these catalysts, iridium particle sizes were very small (1–3 nm). Instead, some thermal decomposition of both precursors was observed during deposition on silica. At conditions, where no or very little decomposition of the precursors took place, the differences in the chemical state and characteristics of the as-prepared Ir/support samples were negligible, In ALD, Ir(acac)3 is slightly more stable at high deposition temperatures (>200 °C) while Ir(thd)(COD) enables the utilization of larger temperature range since it vaporizes at lower temperature compared to Ir(acac)3. The results thus indicate that Ir(thd)(COD) is a suitable new precursor for ALD.
Original languageEnglish
Pages (from-to)4204-4210
Number of pages7
JournalApplied Surface Science
Volume257
Issue number9
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Iridium
Atomic layer deposition
Catalysts
Oxides
Zeolites
Aluminum Oxide
Silicon Dioxide
Alumina
Silica
Temperature
Pyrolysis
Metals
Particle size
iridium oxide
Decomposition

Keywords

  • iridium catalysts
  • ALD
  • metal precursor
  • catalyst characterization

Cite this

Vuori, H. ; Pasanen, Antti ; Lindblad, M. ; Niemelä, M. V. ; Krause, A. O. I. / The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition. In: Applied Surface Science. 2011 ; Vol. 257, No. 9. pp. 4204-4210.
@article{e4aefe245de14455931f99bd1235db7e,
title = "The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition",
abstract = "Alumina, silica and beta zeolite supported iridium catalysts were prepared by atomic layer deposition (ALD) from two different metal precursors, Ir(acac)3 and Ir(thd)(COD). The use of Ir(thd)(COD) in ALD is reported for the first time. The aim was to investigate the effect of the precursor on catalyst surface species, chemical state and characteristics. Controllable ALD reaction was successful with both iridium precursors on alumina and with Ir(acac)3 on β zeolite. On these catalysts, iridium particle sizes were very small (1–3 nm). Instead, some thermal decomposition of both precursors was observed during deposition on silica. At conditions, where no or very little decomposition of the precursors took place, the differences in the chemical state and characteristics of the as-prepared Ir/support samples were negligible, In ALD, Ir(acac)3 is slightly more stable at high deposition temperatures (>200 °C) while Ir(thd)(COD) enables the utilization of larger temperature range since it vaporizes at lower temperature compared to Ir(acac)3. The results thus indicate that Ir(thd)(COD) is a suitable new precursor for ALD.",
keywords = "iridium catalysts, ALD, metal precursor, catalyst characterization",
author = "H. Vuori and Antti Pasanen and M. Lindblad and Niemel{\"a}, {M. V.} and Krause, {A. O. I.}",
year = "2011",
doi = "10.1016/j.apsusc.2010.12.021",
language = "English",
volume = "257",
pages = "4204--4210",
journal = "Applied Surface Science",
issn = "0169-4332",
publisher = "Elsevier",
number = "9",

}

The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition. / Vuori, H. (Corresponding Author); Pasanen, Antti; Lindblad, M.; Niemelä, M. V.; Krause, A. O. I.

In: Applied Surface Science, Vol. 257, No. 9, 2011, p. 4204-4210.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition

AU - Vuori, H.

AU - Pasanen, Antti

AU - Lindblad, M.

AU - Niemelä, M. V.

AU - Krause, A. O. I.

PY - 2011

Y1 - 2011

N2 - Alumina, silica and beta zeolite supported iridium catalysts were prepared by atomic layer deposition (ALD) from two different metal precursors, Ir(acac)3 and Ir(thd)(COD). The use of Ir(thd)(COD) in ALD is reported for the first time. The aim was to investigate the effect of the precursor on catalyst surface species, chemical state and characteristics. Controllable ALD reaction was successful with both iridium precursors on alumina and with Ir(acac)3 on β zeolite. On these catalysts, iridium particle sizes were very small (1–3 nm). Instead, some thermal decomposition of both precursors was observed during deposition on silica. At conditions, where no or very little decomposition of the precursors took place, the differences in the chemical state and characteristics of the as-prepared Ir/support samples were negligible, In ALD, Ir(acac)3 is slightly more stable at high deposition temperatures (>200 °C) while Ir(thd)(COD) enables the utilization of larger temperature range since it vaporizes at lower temperature compared to Ir(acac)3. The results thus indicate that Ir(thd)(COD) is a suitable new precursor for ALD.

AB - Alumina, silica and beta zeolite supported iridium catalysts were prepared by atomic layer deposition (ALD) from two different metal precursors, Ir(acac)3 and Ir(thd)(COD). The use of Ir(thd)(COD) in ALD is reported for the first time. The aim was to investigate the effect of the precursor on catalyst surface species, chemical state and characteristics. Controllable ALD reaction was successful with both iridium precursors on alumina and with Ir(acac)3 on β zeolite. On these catalysts, iridium particle sizes were very small (1–3 nm). Instead, some thermal decomposition of both precursors was observed during deposition on silica. At conditions, where no or very little decomposition of the precursors took place, the differences in the chemical state and characteristics of the as-prepared Ir/support samples were negligible, In ALD, Ir(acac)3 is slightly more stable at high deposition temperatures (>200 °C) while Ir(thd)(COD) enables the utilization of larger temperature range since it vaporizes at lower temperature compared to Ir(acac)3. The results thus indicate that Ir(thd)(COD) is a suitable new precursor for ALD.

KW - iridium catalysts

KW - ALD

KW - metal precursor

KW - catalyst characterization

U2 - 10.1016/j.apsusc.2010.12.021

DO - 10.1016/j.apsusc.2010.12.021

M3 - Article

VL - 257

SP - 4204

EP - 4210

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 9

ER -