Abstract
This chapter reviews the mechanisms of reactions undergone by the carbon skeletons of aliphatic and alicyclic hydrocarbons in the presence of metallic catalysts. Film deposition on a single crystal substrate can lead to the formation of an epitaxed single crystal film. Only two crystalline substrates have had appreciable use for the preparation of the metal film catalysts. These are mica and rocksalt. Mica is a convenient substrate for film growth. In actual catalytic experiments, ultrathin metal films have been used on mica, glass, and silica substrates. It would also be possible to use substrates such as cleaved or evaporated rocksalt or other crystallite substrate. A mica substrate has the considerable advantage that it can be made to present a large and uniform surface and that mica slivers carrying film crystallites can readily be cleaved from the mica sheet. Because these slivers can be made thin enough to pass a 100-keV electron beam, the metal crystallites can be observed directly in the electron microscope.
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