The dissimilar twins – a comparative, site-selective in situ study of CO adsorption and desorption on Pt(322) and Pt(355)

Surface sites on Pt–CeO2mixed oxide catalysts probed by CO adsorption: a synchrotron radiation photoelectron spectroscopy study

“…The binding energy of peak (F) in the C 1s region is consistent with assignment to CO adsorbed at on-top sites on metallic Pt particles. [33][34][35][36] Furthermore, the occurrence of peak (V) as a shifted component of peak (IV) is consistent with the core level shift due to CO adsorption. 35,36 In Fig.…”

“…For instance, CO molecules adsorbed on different Pt surface sites can be identified by the binding energy of the corresponding features in the C 1s spectrum. [33][34][35][36] The carbonate and carboxylate species can also be observed by means of SRPES under UHV conditions. 22,23,37,38 In the present paper we employ SRPES to monitor the reactivity of Pt-CeO 2 films towards CO.…”

Bridging the structure gap: Chemistry of nanostructured surfaces at well-defined defects

“…At variance with the case of Rh, on Pd surfaces the reactivity is low, even at room temperature and on Pd(511). (110) and Pd (320) In order to elucidate the role of step and terrace morphology for CO and NO adsorption at transition metal surface we report here a few examples, starting with a comparison of the behaviour of Pd(320) with respect to Pd (110). Pd(320) is a vicinal surface of Pd(110) characterised by a high density of (100)-like monoatomic steps.…”

“…The discrepancies with the dynamical LEED results were ascribed to neglecting interlayer relaxations in the experimental analysis [73]. Denoting by − and + signs contraction and expansion of the interlayer spacing, respectively, the sequence of the relaxation is : First principle calculations were also performed for stepped Pd (211), (311), (320) and (551), each having three atom wide terraces [74]. The vicinals to Pd (110) came out to be more prone to larger and deeper relaxations with respect to the Pd(111) counterparts.…”

Mobility and Oxidation of Adsorbed CO on Shape-Controlled Pt Nanoparticles in Acidic Medium

“…Also, the diffusion can be 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 influenced by the lateral interaction present in the adsorbate layer. In fact, as examined for stepped Pt surfaces, CO adsorbs more strongly in under-coordinated sites than in terrace sites [39][40][41][42] , and the rate of CO filling on under-coordinated is higher as higher is the overall CO coverage. 35 The argument above can be employed, at least in part, to justify why the CO ads does behave like an immobile species during its oxidation.…”