AVS 46th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS-WeP

Paper SS-WeP6
Structure of MnO@sub x@/Rh(100) studied by STM

Wednesday, October 27, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: H. Nishimura, University of Tsukuba, Japan
Authors: H. Nishimura, University of Tsukuba, Japan
T. Tashiro, University of Tsukuba, Japan
T. Fujitani, National Institute for Resources and Environment, Japan
J. Nakamura, University of Tsukuba, Japan
Correspondent: Click to Email
A modified Rh/SiO@sub 2@ catalyst with Fe or Mn shows excellent catalytic activity for the hydrogenation of CO into C@sub 2@ oxygenates such as acetic acid, ethanol and acetoaldehyde. The active sites may be located at the interface between Rh and MnO@sub x@ species. We have studied the structure of a MnO@sub x@ deposited Rh(100) surface using an ultra high vacuum scanning tunneling microscope (UHV-STM). The deposition of Mn over a Rh(100) surface was performed by resistively heating a Ta boat and then the Rh sample was annealed in an oxygen atmosphere to prepare the MnO@sub x@ species. The STM images showed a c(2x2) structure and a characteristic square unit (30 Å x 30 Å), which were tentatively assigned to Mn-Rh surface alloy and MnO@sub x@ species, respectively. A (111) like structure with six-fold symmetry was also assigned to MnO@sub x@ species.