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

Publication: Research - peer-review › Journal article – Annual report year: 2011

Standard

Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening. / Challa, Sivakumar R.; Delariva, Andrew T.; Hansen, Thomas Willum; Helveg, Stig; Sehested, Jens; Hansen, Poul L.; Garzon, Fernando; Datye, Abhaya K.

In: American Chemical Society. Journal, Vol. 133, No. 51, 2011, p. 20672-20675.

Publication: Research - peer-review › Journal article – Annual report year: 2011

In: American Chemical Society. Journal, Vol. 133, No. 51, 2011, p. 20672-20675.

Publication: Research - peer-review › Journal article – Annual report year: 2011

Bibtex

@article{b6b2ff7315fd4079a5101dd33396696b,

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

publisher = "American Chemical Society",

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",

volume = "133",

number = "51",

pages = "20672--20675",

journal = "American Chemical Society. Journal",

issn = "0002-7863",

}

RIS

TY - JOUR

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

A1 - Challa,Sivakumar R.

A1 - Delariva,Andrew T.

A1 - Hansen,Thomas Willum

A1 - Helveg,Stig

A1 - Sehested,Jens

A1 - Hansen,Poul L.

A1 - Garzon,Fernando

A1 - Datye,Abhaya K.

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.

PB - American Chemical Society

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

JO - American Chemical Society. Journal

JF - American Chemical Society. Journal

SN - 0002-7863

IS - 51

VL - 133

SP - 20672

EP - 20675

ER -