By D.D. Eley, Herman Pines, Paul B. Weez (Eds.)
Given that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various parts of catalysis study. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra resources for Advances in Catalysis, Vol. 28
These effects will, however, be of no importance under the conditions of the model studies discussed here and will, therefore, not be considered further for the sake of simplicity. iii. As will be shown in detail, the Langmuir-Hinshelwood reaction between both reactants in the chemisorbed state is the decisive and only clearly detectable reaction path. 5, 176). iv. The Eley-Rideal mechanism assumes that one of the reactants is in its normal chemisorbed state ( o a d ) , whereas the second (CO) reacts either by direct collision from the gas phase or from a weakly held physisorbed state.
1 Torr the stationary CO coverage will be For T >, 500 K and pco 5 small. If, however, po2 > pco, under steady-state conditions the oxygen coverage increases (since 0, desorption is negligible) and r becomes independent of po,. This effect of r switching over from first- to zero-order kinetics with respect to po, can again be seen in curve a of Fig. 37. 08 r is even independent of the oxygen coverage (176). 25 and CO, formation proceeds along the domain boundaries. Since the metal-oxygen bond is about twice as strong as that for CO, the latter molecule will diffuse much faster over the surface and the reaction may be considered to approximately take place between highly mobile CO and a quasi-fixed matrix of O,, (see also Section 11,D).
Figure 27 shows the dependence of the initial sticking coefficient on the substrate temperature for Pd( 11 1). It could be shown (101) that the linear decrease with increasing substrate temperature is due to the increased probability for desorption from the precursor state rather than a decreased probability for trapping into the precursor state. F. KINETICS OF DESORPTION AND ADSORPTION ENERGIES Thermal desorption of 0, has been observed in the range from 700 to 1800 K, depending on whether the oxygen is chemisorbed or incorporated.
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