Surface Science of Catalysis: In Situ Probes and Reaction by Daniel J. Dwyer, Friedrich M. Hoffmann

By Daniel J. Dwyer, Friedrich M. Hoffmann

Provides a very good evaluation of the influence of floor technology at the box of catalysis. Explores the fascinating new advances in floor technological know-how and catalysis, which for the 1st time let for direct spectroscopic and kinetic statement of floor reactions. Twenty-two chapters hide basic points of catalytic reactions at surfaces, functions of floor probes to the examine of catalytic reactions and kinetics, and novel features of catalytic reactions at surfaces. Highlights the luck of floor technology suggestions within the learn of industrially vital catalytic strategies, together with hydrogenation of CO to supply hydrocarbons and methanol, the oxidation of methane to methanol, and conversions of CO to carbon dioxide.

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Additional resources for Surface Science of Catalysis: In Situ Probes and Reaction Kinetics (ACS Symposium Series)

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826 (Figure 6a, solid line). Root et. al. 83 using XPS. 1 (Figure 6b, solid line). ch003 Linearization of Coverage Dependent CO Desorption. Here we present the example of CO desorption from Rh(l 11). Desorption rates and sticking coefficients of CO on Rh(l 11) have been shown in the past to be coverage dependent (33). The coverage dependent rate expression is: ^ = Sco(6co,T )Ico - k(8 o,Ts)e o S C C ( g ) Experimentally, we use an intense, continuous CO beam to produce a desired steady state coverage while a weak, modulated beam induces small coverage perturbations.

Reproduced with permission from ref. 48. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1992. 2. ch002 *dmc Desorption Direct Dissociation ~s Dissociative Chemisorption State \ Recombinative Desorption Figure 5. 1 eV. Note that no direct path is indicated connecting the dissociative chemisorption state with the gas phase. We believe that a qualitatively similar diagram applies to the N ^ e ^ l l ) system. (Reproduced with permission from ref. 48. 48 eV A- - (a) -10 l \ . 42 eV I I I I 2 3 1/T * 10 (IT ) 3 1 S Figure 6.

In 1987, we observed that the dissociative chemisorption probability of N ^ on F e ( l l l ) could be increased enormously (by five orders of magnitude) by increasing the kinetic energy of the incident N . While somewhat more dramatic, this observation was qualitatively similar to that seen in earlier studies (11-20), such as that of the dissociation of N on W(l 10) (11), where an increase in S of over a factor of 100 had been reported. However, in all previous studies, results had been discussed in terms of a more or less direct dissociation mechanism, similar to that indicated in Figure 1.

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