Adsorption and decomposition of methanol on gold nanoclusters supported on a thin film of Al2O3/NiAl(100)

Shrikrishna D. Sartale, Hong Wan Shiu, Ming Han Ten, Won Ru Lin, Meng Fan Luo, Yin Chang Lin, Yao Jane Hsu

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Adsorption and decomposition of methanol on Au nanoclusters supported on an ordered ultrathin film of Al2O3/NiAl(100) have been investigated by means of their photoelectron spectra excited with synchrotron radiation and scanning tunneling microscopy. The results show adsorption sites on the clusters of at least two types: one catalyzes the decomposition of methanol via scission of the O-H bond into CO at a temperature as low as 120 K, whereas the other activates dehydrogenation only into methoxy. The CO from the decomposition remains on the surface up to 250 K, begins to desorb above 250 K, and decomposes further into elemental carbon around 350 K. AU carbon species are removable from the surface at 450 K, a temperature much lower than on other metals studied. Regarding effects of morphology of the clusters on the reactivity, smaller Au clusters, of height 1-2 atomic layers, exhibit inactivity toward the decomposition of methanol.

Original languageEnglish
Pages (from-to)2066-2073
Number of pages8
JournalJournal of Physical Chemistry C
Issue number6
StatePublished - 14 Feb 2008


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