By D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)
On the grounds that 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the various components of catalysis study. This quantity comprises articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra info for Advances in Catalysis, Vol. 26
For iron for example, the major impurity is sulfur, and its removal must be carried out outside the vacuum system in a furnace in a constant hydrogen flow for a long period of time (days). Trace metallic impurities or nonmetallic impurities may be removed either by argon ion bombardment in the vacuum chamber or by chemical treatment using gas-surface interactions of different types. We shall restrict most of our discussion to studies of platinum surfaces, which will serve as a model of surface studies of other catalysts.
On the [7(111) x (310)l face, process (3) predominates, while process (4) is the most important on the (4(1 1 I 1 i loo)] face. The lack of reactivity of low Miller index surfaces in hydroc i P I I reactions indicates the importance of steps in breaking C-H and C- honds so important in various surface reactions of hydrocarbons. , low coordination number sites, are responsible for decomposition via dehydrogenation and C-C bond breaking of hydrocarbon molecules, which can take place at these sites with near zero activation energy.
Only hydrogen evolution is observed under conditions of flash desorption. The differences between the ordering characteristics of the Pt(l1 I ) and Ir( 1 1 1j surfaces after heating to high temperature ( >800°C) following hydrocarbon adsorption, are marked. Ir(ll1) yields an ordered (9 x 9) coincidence carbon structure, which can be attributed to hexagonal overlayers of carbon similar to that of the basal plane of graphite or benzene, deposited on the (1 1 1 ) surface. A similar structure was found on the Pt(S)-[6(111) x (loo)] surface when this surface was heated to high temperature in the presence of various hydrocarbons.