AVS 46th International Symposium
    Surface Science Division Tuesday Sessions
       Session SS2-TuM

Paper SS2-TuM4
The Atomic-scale Structure of MoS@sub 2@ Nano-cluster Catalysts Studied by STM

Tuesday, October 26, 1999, 9:20 am, Room 607

Session: Model Catalysts
Presenter: S. Helveg, University of Aarhus, Denmark
Authors: S. Helveg, University of Aarhus, Denmark
J.V. Lauritsen, University of Aarhus, Denmark
E. Laegsgaard, University of Aarhus, Denmark
I. Stensgaard, University of Aarhus, Denmark
B.S. Clausen, Haldor Topsoe Research Laboratories, Denmark
H. Topsoe, Haldor Topsoe Research Laboratories, Denmark
F. Besenbacher, University of Aarhus, Denmark
Correspondent: Click to Email
Hydrodesulfurization (HDS) catalysis has recently attracted an increased interest partly augmented by the new severe environmental legislation. The activity of the industrial HDS catalysts has uniquely been related to the edge structure of MoS@sub 2@ nano-crystals. However, very little is known about the actual shape of the nano-crystalline MoS@sub 2@ particles and the exact edge structures. To obtain such structural insight, we have prepared a model system of 30 Å wide MoS@sub 2@ nano-clusters dispersed on the Au(111) model surface. High resolution Scanning Tunneling Microscopy (STM) studies unequivocally reveal that the MoS@sub 2@ nano-clusters are of triangular shape, and from atomically resolved STM images of the edge structures, we tentatively conclude that the edges are S restructured Mo terminated edges.