Abstract: It is known that Pt clusters on the surface of chlorinated alumina are highly stable against sintering in reducing or inert environments and easily disintegrate into single atoms upon heat treatments under O2. However, this study reveals that partially oxidized nanoclusters tend to grow in size and reconstruct upon further annealing in an inert gas (conventionally prepared 0.25 ÷ 1 %Pt/γ-Al2O3-Cl samples). Even more surprisingly, the sintering takes place at rather mild conditions (He/Ar, 400–500 °C) but stops soon after it commences (within minutes). The lower the temperature of O2-pretreatment (500 → 20 °C), the sharper the further drop in metal dispersion, and one to a few cycles of the consecutive treatments could be sufficient for the unique properties of Pt clusters to be lost. Possible reasons, contributing factors, and implications of the results for different catalytic systems are discussed.

Cite: Lisitsyn A.S. , Gerasimov E.Y. , Kuznetsova N.I.
An Unexpected Case of Instability of Metal Nanoclusters
Journal of Catalysis. 2024. V.436. 115618 :1-13. DOI: 10.1016/j.jcat.2024.115618 WOS Scopus РИНЦ AN OpenAlex

Dates:

Submitted:	Mar 28, 2024
Accepted:	Jun 21, 2024
Published online:	Jun 22, 2024
Published print:	Aug 1, 2024

Identifiers:

Web of science:	WOS:001261952800001
Scopus:	2-s2.0-85196946823
Elibrary:	68401738
Chemical Abstracts:	2024:1440760
OpenAlex:	W4399913647

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