Advances in Catalysis, Vol. 26 by D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)

By D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)

Considering the fact that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various parts of catalysis learn. This quantity contains articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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H) Schematic representation of the (100) surface with hexagonal overlayer. (c) Diffraction pattern from the Pt(t00)-(1 x 1) structure. (d) Schematic representation of the (100) surface. from 25°C to the melting point, although at elevated temperatures carbon can diffuse to the surface and cause transformation of the structure to the impurity-stabilized (1 x 1) surface structure. The same structure is observed for other 5d transition metals that are neighbors of platinum in the periodic table, such as gold and iridium.

Conditions range from low temperature, inert gas physisorption to the chemisorption of reactive diatomic gas molecules and hydrocarbons at room temperature and above. A listing of over 200 adsorbed surface structures, mostly of small molecules, adsorbed on low Miller index surfaces can be found in a recent review (1). There are two systems to denote the unit mesh of ordered monolayer structures formed upon adsorption, The first system, originally proposed by Wood (19a), is probably the most commonly used and can be applied to systems in which the angle between the vectors a and b is the same for the adsorbed structure as for the substrate.

ANALYZER 7 CRYSTAL 7 EKIN EkIN VACUUM LEVEL FIG. 14. AES, experimental configuration and energy diagram. 7 I 0 100 I I I I I 200 303 400 500 600 volts FIG. 15. Auger spectra of platinum (a) in the presence of carbon and carbon monoxide and (b) in the clean state. ACTIVE SITES IN HETEROGENEOUS CATALYSIS 25 B . TRANSPORT TECHNIQUES 1. In all of these experiments, small-surfacearea (approximately 1 cm’), single-crystal or polycrystalline catalyst samples can readily be used as long as the reaction rate is greater than product molecules/surface atom/sec.

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