Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening

Sivakumar R. Challa; Andrew T. Delariva; Thomas Willum Hansen; Stig Helveg; Jens Sehested; Poul L. Hansen; Fernando Garzon; Abhaya K. Datye

doi:10.1021/ja208324n

Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening

Sivakumar R. Challa, Andrew T. Delariva, Thomas Willum Hansen, Stig Helveg, Jens Sehested, Poul L. Hansen, Fernando Garzon, Abhaya K. Datye

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Sintering of nanoparticles (NPs) of Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture of H2 and H2O at a pressure of 3.6 mbar at 750 °C, conditions relevant to methane steam reforming. The TEM images revealed an increase in the mean particle size due to disappearance of smaller, immobile NPs and the resultant growth of the larger NPs. A new approach for predicting the long-term sintering of NPs is presented wherein microscopic observations of the ripening of individual NPs (over a span of a few seconds) are used to extract energetic parameters that allow a description of the collective behavior of the entire population of NPs (over several tens of minutes).

Original language	English
Journal	Journal of the American Chemical Society
Volume	133
Issue number	51
Pages (from-to)	20672-20675
ISSN	0002-7863
DOIs	https://doi.org/10.1021/ja208324n
Publication status	Published - 2011

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title = "Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening",

abstract = "Sintering of nanoparticles (NPs) of Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture of H2 and H2O at a pressure of 3.6 mbar at 750 °C, conditions relevant to methane steam reforming. The TEM images revealed an increase in the mean particle size due to disappearance of smaller, immobile NPs and the resultant growth of the larger NPs. A new approach for predicting the long-term sintering of NPs is presented wherein microscopic observations of the ripening of individual NPs (over a span of a few seconds) are used to extract energetic parameters that allow a description of the collective behavior of the entire population of NPs (over several tens of minutes).",

author = "Challa, {Sivakumar R.} and Delariva, {Andrew T.} and Hansen, {Thomas Willum} and Stig Helveg and Jens Sehested and Hansen, {Poul L.} and Fernando Garzon and Datye, {Abhaya K.}",

year = "2011",

doi = "10.1021/ja208324n",

language = "English",

volume = "133",

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journal = "Journal of the American Chemical Society",

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T1 - Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening

AU - Challa, Sivakumar R.

AU - Delariva, Andrew T.

AU - Hansen, Thomas Willum

AU - Helveg, Stig

AU - Sehested, Jens

AU - Hansen, Poul L.

AU - Garzon, Fernando

AU - Datye, Abhaya K.

PY - 2011

Y1 - 2011

N2 - Sintering of nanoparticles (NPs) of Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture of H2 and H2O at a pressure of 3.6 mbar at 750 °C, conditions relevant to methane steam reforming. The TEM images revealed an increase in the mean particle size due to disappearance of smaller, immobile NPs and the resultant growth of the larger NPs. A new approach for predicting the long-term sintering of NPs is presented wherein microscopic observations of the ripening of individual NPs (over a span of a few seconds) are used to extract energetic parameters that allow a description of the collective behavior of the entire population of NPs (over several tens of minutes).

AB - Sintering of nanoparticles (NPs) of Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture of H2 and H2O at a pressure of 3.6 mbar at 750 °C, conditions relevant to methane steam reforming. The TEM images revealed an increase in the mean particle size due to disappearance of smaller, immobile NPs and the resultant growth of the larger NPs. A new approach for predicting the long-term sintering of NPs is presented wherein microscopic observations of the ripening of individual NPs (over a span of a few seconds) are used to extract energetic parameters that allow a description of the collective behavior of the entire population of NPs (over several tens of minutes).

U2 - 10.1021/ja208324n

DO - 10.1021/ja208324n

M3 - Journal article

SN - 0002-7863

VL - 133

SP - 20672

EP - 20675

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 51

ER -

Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening

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