The chemisorption of CO and NO on Rh(110)

Baird, Ronald J.; Ku, R.; Wynblatt, P.

doi:10.1016/0039-6028(80)90672-x

Cited by 155 publications

(48 citation statements)

References 44 publications

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“…On the clean SmOx/Rh(1 0 0) model surface before exposure to CO, two peaks at 289.7 and 286.7 eV are observed, which arise from the excitation of 307.2 eV Rh 3d 5/2 electrons by Al Ka 5 (1506.5 eV) and Al Ka 6 (1510.1 eV) satellite X-rays, as previously reported on the Rh(1 0 0) [32], Rh(1 1 0) [40] and Rh (1 1 1) [41] surfaces. Fig.…”

Section: Resultssupporting

confidence: 49%

Evidence for perimeter sites over SmOx-modified Rh(100) surface by CO chemisorption

et al. 2004

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Section: Resultssupporting

confidence: 49%

Evidence for perimeter sites over SmOx-modified Rh(100) surface by CO chemisorption

et al. 2004

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“…The adsorption of oxygen on clean Rh produces O(2p) emission in the He H UP spectrum at 5.5 eV [13]. When boron-contaminated Rat was exposed to a small amount of oxygen at 300 K, the photoemission peak developed in the difference spectrum at 5.9 eV; its intensity increased with the exposure.…”

Section: 34 Ups Studiesmentioning

confidence: 99%

Segregation of boron and its reaction with oxygen on Rh

Kiss

Révész

Solymosi

1989

Applied Surface Science

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The segregation of boron and its reactivity towards oxygen has been investigated by means of AES, XPS, UPS and ELS (in the electronic range) in the temperature range 11)0-1300 K. The segregation of boron in a Rh foil started from 700 K. The ~egregated boron produced a peak in XPS for the B(ls) level a~ 187.8 eV and emissions in UPS at 4,0 and 8,6-9.0 eV for B(2p) and B(2sp2), respectively, Analysis of the results suggested that the segregated boron on Rat foil mainly forms dimers or islands, instead of isolated monomers, without any significant charge transfer between rhodium and boron, Upon oxygen adsorption the B(ls) and O(ls) levels shifted to higher binding euergy (to 191,5 ~lnd 532.6 eV, respectively) and a new loss in the EELS was produced at 9,4 eV, demonstrating a strong chemical interaction between oxygen and boron. The interaction occurs at as low as 159 K, as indicated by tbe development of the 9.4 eV loss feature, It is assumed that boron suboxides are formed in which the B-B bond is retained, The cleavage of the B-B bond starts above 400 K attd is completed at 750 K, when the 2sp: hybrid state at 8.6-9.0 eV in the UPS, due to the B-B bond, is no longer detected. Formation of a polymer-like B:O3 species is proposed which reacts with elemental boron above 900 K to give B:O~. I. fail'eductionThe presence of adatoms (either as impurities or promot.rs) on metal surfaces can drastically influence the surface reactivity; this is in most cases attributed to an electronic interaction between the adatoms and the metals. However, there is increasing evidence that surface adatoms can interact directly with gaseous molecules, thereby strongly influencing the reactivity [1].We recently demonstrated that boron impurity segregating to a Rh surface dramatically alters the reactivity of the Rh surface towards N-and O-contain. ing moieties, such as CN [2], NO [3], CO 2 [41 and H~O 151, A possible reason for this phenomenon is that boron forms very strong bonds with N and O, which can promote the processes of surface dissociation of the adsorbed molecules. Following surface dissociation, we detected the formation of dissociation products via thermal desorption, and a new feature at 9,4 and 7.2 eV 0169-4332/89/$03.50

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“…These studies have included both wel1-characterized single crystal surfaces and supported catalysts, and have utilized a number of surface analysis techniques. In particular, the chemisorption of nitric oxide has been studied on polycrystal1Ine rhodium wire (6), and the Rh(lOO) (7), Rh(lll) (7), Rh(IIO) (8), Rh(33l) (9,10), and Rh(755) (9) single crystal surfaces. These studies have utilized a variety of surface techniques, including Auger electron spectroscopy (AES), low energy electron diffraction (LEED), x-ray photoelectron spectroscopy (XPS), and thermal desorption spectroscopy (TDS).…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

“…The adsorption of nitric oxide on the Rh(llO) surface has been studied utilizing TDS, AES, LEED, and XPS by Baird et al (8). These authors report that nitric oxide is chemisorbed dissociatively on the Rh(llO) surface for exposures less than 0.5 L, forming an ordered (2 X 1) overlayer.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

“…A XPS analysis of this overlayer yielded one principal peak at 397,4 eV, in the N Is region, and a broad peak centered at 530.5 eV, in the oxygen Is region. These peaks were assigned to atomic nitrogen and oxygen from dissociatively chemisorbed nitric oxide (8). At expo sures greater than 0.5 L, the background intensity of the (2 x 1) LEED pattern increased, and several new features appeared in the XPS spectrum.…”

Section: Reactant/product-catalyst Interactionsmentioning

confidence: 99%

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