Adsorption of small molecules and catalytic reactions on free neutral metal clusters

Mats Andersson; Arne Rosen

doi:10.1117/12.504108

4 December 2003 Adsorption of small molecules and catalytic reactions on free neutral metal clusters

Mats Andersson, Arne Rosen

Proceedings Volume 5223, Physical Chemistry of Interfaces and Nanomaterials II; (2003) https://doi.org/10.1117/12.504108
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

We present in this article some studies of the chemical reactivity of free metal clusters (~8-50 atoms) investigated at single-collision-like conditions in a molecular beam experiment. A beam of clusters is generated with a pulsed laser vaporization source and after expansion into vacuum the cluster beam passes collision cells, in which the clusters can make one or a few collisions with reactive gas molecules. Pure clusters and reaction products are detected with laser ionization and mass spectrometry. A strong size dependence in the reaction probability of N₂ with tungsten clusters is observed. When the temperature of the cluster source is lowered from room temperature to 80 K the reactivity increases strongly and N2 adsorbs in a weakly bound molecular state, whereas only a strongly bound dissociative state is stable at room temperature. The reactivity of platinum clusters with O₂ is much less size dependent and the reaction probability is high on all investigated sizes. If the Pt_nO_m products pass a second cell containing H₂(D₂) the number of adsorbed oxygen atoms decreases with increasing H₂ pressure. This is explained by formation of water molecules in a catalytic reaction on the surface of the Pt clusters.

Citation Download Citation

Mats Andersson and Arne Rosen "Adsorption of small molecules and catalytic reactions on free neutral metal clusters", Proc. SPIE 5223, Physical Chemistry of Interfaces and Nanomaterials II, (4 December 2003); https://doi.org/10.1117/12.504108

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