By D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)
Considering 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the varied components of catalysis learn. This quantity comprises articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra resources for Advances in Catalysis, Vol. 26
By suitable calibration with known standards, the intensities of the peaks can be used for quantitative as well as qualitative surface analysis (21b). A typical Auger spectrum from platinum surfaces is shown in Fig. 15. The presence of small concentrations of carbon, the most common impurities on surfaces, are easily discernible. ) and to studies of liquid surfaces as well. 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.
Such a marked change in the chemical activity from surface site to surface site is one of the major attributes ofplatinum that is responsible for its unique catalytic activity. On iridium surfaces (and as will be discussed later, even on low Miller index surfaces) partial decomposition of hydrocarbons may occur even at low temperatures and pressures due to the stronger adsorbate-substrate, hydrocarbon-metal bonds. Even though for other transition metals the chemistry of low coordination number surface sites is likely to be different from the terrace atom sites that are predominant on low Miller index surfaces, the hydrocarbon molecules may not remain intact on either high or low Miller index crystal faces.
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. However, on the Pt( I 1 1) surface under similar experimental conditions, one observes a ringlike diffraction feature that is characteristic of a graphite overlayer with rotationally disordered domains.
Advances in Catalysis, Vol. 26 by D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)