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Methane Activation Mediated by Dual Gold Atoms Doped in Aluminium Oxide Cluster Cations Au 2 Al 2 O 3 +
Author(s) -
Zhou XiaoHong,
Li ZiYu,
Jiang LiXue,
He ShengGui,
Ma TongMei
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601868
Subject(s) - chemistry , heteronuclear molecule , reactivity (psychology) , dimer , oxide , metal , atom (system on chip) , gold cluster , methane , gold compounds , hydrogen atom abstraction , cluster (spacecraft) , inorganic chemistry , crystallography , hydrogen , photochemistry , density functional theory , molecule , computational chemistry , organic chemistry , medicine , alternative medicine , pathology , computer science , programming language , combinatorial chemistry , embedded system
Abstract The study of chemical reactions between gold‐doped oxide clusters and methane can provide molecular level mechanisms to understand the activity of gold species supported on metal oxides. The role of single gold atom in methane activation has been identified, while the effect of two or more gold atoms is far from clear. By employing mass spectrometry and theoretical calculations, the reactivity of heteronuclear oxide clusters with dual gold atoms (Au 2 Al 2 O 3 + ) toward methane was explored. Three major reaction products with the formation of CH 3 • , AuCH 2 , and Au were observed experimentally. Theoretical calculations indicate that Au 2 Al 2 O 3 + contains two separate gold atoms and one oxygen−centred radical (O −• ). Two types of mechanisms for methane activation are identified. The reaction initiated by the O −• site primarily generates the CH 3 • through hydrogen atom abstraction while the reaction starting from the gold site mainly contributes to the generation of AuCH 2 and Au via the mechanism of Lewis acid‐base pairs. It was revealed that the formation of gold dimer species driven by the aurophilic interaction plays an important role in the second C−H bond activation.