New PDF release: Advances in Catalysis, Vol. 28

By D.D. Eley, Herman Pines, Paul B. Weez (Eds.)

ISBN-10: 0120078287

ISBN-13: 9780120078288

When you consider that 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the varied parts of catalysis learn. This quantity contains articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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V. Oxidation of CO on Platinum Following the initial work by Langmuir ( I ) the catalytic oxidation of carbon monoxide on platinum has been investigated frequently with polycrystalline samples (132, 183-190) as well as with single crystal surfaces (149, 151, 191-197) by applying stationary and nonstationary methods including the molecular beam technique. The general trends observed are 52 T. ENGEL AND G. ERTL 6 r*---,.

181) surfaces of palladium. Of these investigations, studies with the most densely packed ( 1 11) plane revealed the closest insight into the primary steps of this reaction, so that these results will be outlined with the most detail. Since the influence of the surface structure is only of minor importance for the kinetics of this reaction, the discussed principles will certainly apply equally well for other crystal planes and more “real” catalyst surfaces. Moreover, it is believed that the essential features are common to the other platinum metals since the adsorption behavior of the reactants as well as the reaction kinetics have much in common.

L/Tshould yield a straight line with slope E d / R and ~ . residence time may be derived from intersection with the ordinate l / t ~ The a determination of the phase lag in the modulated molecular beam experiment and results for the system CO/Pd(I 11) are reproduced in Fig. 19 (101). The resulting value for Ed = 32 & 2 kcal/mol agrees within the limits of error with the isosteric heat of adsorption (34 kcal/mol). 8sec-' and confirms the idea (91) that for the desorption of CO this quantity will usually be larger than simply the vibration frequency of 10' sec- '.

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Advances in Catalysis, Vol. 28 by D.D. Eley, Herman Pines, Paul B. Weez (Eds.)

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