By D.D. Eley, Herman Pines, Paul B. Weez (Eds.)
Considering 1948, this serial has sought to fill the distance among the papers and the textbooks that train the varied parts of catalysis learn. This quantity contains articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Additional resources for Advances in Catalysis, Vol. 28
To1 0 0 0 0 0. 0 0. 0. oooooo . b 0 . . 0 0 O * 0 . 0 . 0 . .. * . O O 0 0 0 . 0 0. O 0 0 . 0 0 0 0 0 0 . 0 0 0 0 . b . . - 0 0 . 0 . (bl ........ ....... 33. 25) is exposed to CO. 25. 33). 33) (88). as was verified by instationary measurements. These will be outlined in connection with the discussion of the reaction mechanism. B. REACTION MECHANISM The individual steps which are possibly involved in the reaction may be formulated as follows : CATALYTIC OXIDATION OF CO ON PLATINUM METALS k, co = CO,, k, (7) 0,4 20,, (8) + toad k co, k 0 , d + co A co, k 0 , + 2CO,, 42 c 0 , Oad 43 (9) (10) (1 1) i.
30 T. ENGEL AND G. ERTL strongly damped upon adsorption by antiresonance effects (243). This state could, however, be identified for O/Ir by means of field-emission spectroscopy (51). The enhancement factor R(E)derived from those measurements is directly proportional to the local density of states on the adsorbate, and the results reproduced in Fig. 24 demonstrate the occurrence of an oxygen-derived level at about 1 eV below EF. C. SURFACE STRUCTURE The interpretation of LEED patterns observed after oxygen adsorption on the platinum group metals is complicated by the uncertainty as to whether the periodicity seen is a true reflection of the adsorbate or is due to a mixed adlayer produced by a surface reconstruction.
Molecular adsorption has been observed at temperatures below 100 K on Pt (123) and Ir (124). However, since in the temperature range in which the CO oxidation has an appreciable rate no molecularly adsorbed 0, has been observed, this form of adsorption will not be discussed further here and in the following only the results concerning the tightly bound forms of oxygen will be reviewed. CATALYTIC OXIDATION OF CO O N PLATINUM METALS 25 Oxygen is dissociatively adsorbed on the platinum group metals at temperatures above 100 K as may be concluded from isotopic exchange experiments (125) and from the absence of features in the UPS spectrum that could be assigned to adsorbed molecules (41,83,126-130).