Physisorption and dissociative chemisorption of H2 on sub-nanosized Al anion cluster: ab initio study
Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
Corresponding author: a email@example.com
Revised: 13 October 2010
Published online: 3 December 2010
We have studied the interaction of Al anion cluster with H2. Both the long range interaction and dissociative adsorption have been examined using the established correlated ab initio methods, MP2 and CCSD(T), in conjunction with the augmented correlation consistent basis sets up to aug-cc-pVTZ. The formation of the weakly bound (physisorbed) end-on anion complex Al...H2 is predicted for the interacting Al...H distances of 3.95 Å with the H-H axis pointing towards the `hollow' site of Al and binding energy ( of 0.7 kcal/mol at the estimated complete basis set (CBS) limit of CCSD(T). The barrier height for H2 dissociation on Al of 41.6 (42.9) kcal/mol calculated at the ZPVE-corrected CCSD(T)/aug-cc-pVTZ (estimated CCSD(T)/CBS) level is at least twice as large as that evaluated by us for a dissociative adsorption of H2 on an open-shell Al13 neutral cluster. To our knowledge, this report presents the first “benchmark” quality study of the physisorption and dissociative chemisorption of molecular hydrogen on Al anion cluster.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010