摘要： •Methanol on partially alumina-encapsulated Pt clusters decomposed on the uncovered Pt sites.•Methanol decomposition occurs via dehydrogenation to CO and scission of the C–O bond.•The dehydrogenation on partially encapsulated Pt clusters was hindered to some extent.•The C–O bond scission on partially encapsulated Pt clusters was altered little in comparison to that on Pt clusters. Various surface probe techniques were applied to investigate the decomposition of methanol on partially alumina-encapsulated Pt nanoclusters on an ordered thin film of Al2O3/NiAl(100). The alumina-encapsulated Pt clusters were prepared on annealing Pt clusters (grown by vapor deposition onto the Al2O3/NiAl(100) at 300K) to 650K under UHV conditions. The annealed cluster became a Pt1+–Pt2+ state and partially encapsulated with inert alumina. Methanol on the partially encapsulated Pt clusters decomposed only on the uncovered Pt sites, and through both dehydrogenation to CO and scission of the C–O bond. In comparison to the reactions on Pt clusters, the C–O bond scission was altered little on the partially encapsulated clusters whereas the dehydrogenation was hindered to a certain extent. The quantities of CO and hydrogen produced from the dehydrogenation per surface Pt on the partially encapsulated clusters amounted to only half those on Pt clusters. The altered methanol decomposition was correlated to both electronic and ensemble effects. 出版者： Amsterdam: Elsevier B.V 出版日期： 2014-08-30 出處： Applied surface science, 2014-08, Vol.311, p.763-769 版權： 2014 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0169-4332 識別號： DOI: 10.1016/j.apsusc.2014.05.159
