By D.D. Eley, Herman Pines, Paul B. Weez (Eds.)
Because 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the varied components of catalysis examine. This quantity comprises articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Additional resources for Advances in Catalysis, Vol. 28
A more detailed inspection of the data reveals, however, that the simple first-order precursor-state model does not yield quantitative agreement with the experimental results. This was, for example, shown for the system CO/Pt( 111) [for which excellent agreement between the data reproduced in Fig. 17 of three independent studies was found (58, 61, 110)] as well as for CO/Ir(110) (76). In the latter case the best fit could be achieved with a second-order precursor model in which the sticking coefficient depends on the lifetime of the precursor state as well as on the fraction of doublets of neighboring empty sites (116).
35. Steady-state rate of CO, production on Pd(ll1) as a function of substrate temperature for an0, beam(equiva1ent pressure4 x lO-’Torr) and COpressuresof( x ) 1 x ( 8 )3 x and ( 0 )1 x Torr (176). 46 T. ENGEL AND G. ERTL 550 t 1 TEMPERATUFL IK) 525 500 1 495 r I 1 58- u-30 c, 50- - 5 - ac2 - - L 0 -60 1 I I 1 phase = 113 type measurements by means of the modulated molecular beam technique (176). As an example, Fig. 36 shows a plot of the relaxation time associated with CO, formation with a periodically modulated 0, beam and a constant background CO pressure as a function of the reciprocal temperature.
Recombination and desorption of O,, occurs at temperatures that are above those usually applied in the catalytic CO, formation ( < 700 K), so that this step need not be considered. More severe is the problem of penetration into the bulk and the possible formation of surface oxides. The latter exhibit a much lower reactivity than chemisorbed oxygen. Nevertheless, their existence as well as considerable bulk concentrations of dissolved oxygen cannot be ruled out under stationary reaction conditions with higher total pressures.