Abstract
The catalyst is a key technology for the realization of the sustainable society. The mechanism of heterogeneous catalyst is now being established based on the surface science approach which is supported by the ultrahigh vacuum techniques. Recently ambient pressure techniques are developing. The surface reaction can be now understood based on the machinery concepts of molcules and atoms. Spatiotemporal behavior of the surface atoms and molecules are revealed and what force works between the reactants. In the near future, the surface reaction can be controlled by physical means.
