Adsorption behavior and reaction properties of NO and CO on Rh(111)

Nakamura, Isao; Kobayashi, Y.; Hamada, Hideaki; Fujitani, Tadahiro

doi:10.1016/j.susc.2006.06.009

Cited by 51 publications

(54 citation statements)

References 27 publications

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“…Spectral features associated with linearly bound CO (t CO ) and multiply bound (two, three-fold) CO are visible in the spectra. These vibrational features are consistent with linear and multiply bound vibrational features observed in previous investigations of CO adsorption on single crystal (IRAS, HREELS) [35,[46][47][48], model planar supported [49][50][51], and high surface area Rh catalyst surfaces. [52,53] As mentioned in the Introduction, it is now well-known that undercoordinated ''step-like'' sites on nanoparticle surfaces (surface atoms having \9 nearest neighbors on FCC(111) metals) can have much different catalytic properties than coordinated (''terrace-like'') sites on surfaces [54].…”

Section: Characterization Of Surface Sites Under Uhvsupporting

confidence: 90%

Simulating the Complexities of Heterogeneous Catalysis with Model Systems: Case studies of SiO2 Supported Pt-Group Metals

McClure

Goodman

2011

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Model catalyst surfaces, consisting of vapordeposited metal nanoparticles supported on a planar oxide support, can help to link reactivity studies on well-defined single crystal surfaces with those conducted on high-surface area supported catalysts. When coupled with near atmospheric pressure kinetic and spectroscopic techniques, these well-defined model catalyst surfaces represent a useful approach to combine the power of surface analytical techniques with reactivity studies under relevant reaction conditions. Here, we review recent results of our investigations characterizing the physical and catalytic properties of Pt/SiO 2 and Rh/SiO 2 model catalyst surfaces. As will be discussed, the model catalyst approach can help simulate the complexities of catalytic reactions on supported catalysts, helping to provide insights into the role of particle size, particle morphology, and surface adsorbates in dictating the observed structure-sensitivity (activity and selectivity) during reactions at near atmospheric pressures.

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Section: Characterization Of Surface Sites Under Uhvsupporting

confidence: 90%

Simulating the Complexities of Heterogeneous Catalysis with Model Systems: Case studies of SiO2 Supported Pt-Group Metals

McClure

Goodman

2011

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“…We have also examined the NO adsorption on the Rh(111) surface using XPS. NO coverage increased with increasing NO exposure, and saturation coverage of H NO = 0.71 was obtained at about 50 L [50], which was in good agreement with the exposure (48 L) at which saturation NO adsorption was measured by IRAS (Fig. 5).…”

Section: Adsorption and Decomposition Of No On Rh(111)supporting

confidence: 84%

“…5). On the basis of the IRAS and XPS [50] results, we summarize the NO adsorption process on the Rh(111) surface as follows. NO adsorbed initially on the fcc sites.…”

Section: Adsorption and Decomposition Of No On Rh(111)mentioning

confidence: 99%

Adsorption Behavior and Reaction Properties of NO and CO on Ir(111) and Rh(111)

Nakamura

Fujitani

2009

Catal Surv Asia

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Adsorption and reactions of NO over the clean and and Rh(111) surfaces were investigated using infrared reflection absorption spectroscopy (IRAS) and temperature programmed desorption (TPD). Two NO adsorption states, indicative of hollow and atop sites, were present on Ir(111). Only NO adsorbed on hollow sites dissociated to N a and O a . The dissociated N a desorbed as N 2 by recombination of N a and by a disproportionation reaction between atop-NO and N a . Preadsorbed CO inhibited atop-NO, whereas hollow-NO was not affected. Adsorbed CO reacted with O a and desorbed as CO 2 . NO adsorbed on the fcc-hollow, atop, and hcp-hollow sites in that order over Rh(111). The hcp-NO was inhibited by preadsorbed atop-CO, and fcc-NO and atop-NO were inhibited by CO preadsorbed on each type of the sites, indicating that NO and CO competitively adsorbed on Rh(111). From the Rh(111) surface-coadsorbed NO and CO, N 2 was produced by fcc-NO dissociation, and CO 2 was formed by reaction of adsorbed CO with O a from dissociated fcc-NO.

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“…Studies of NO-CO reaction have been carried out on Pt(1 0 0) [30][31][32][33][34][35][36][37], Pt(1 1 1) [38], Pt(1 1 2) [39], Pd(1 0 0) [40], Pd(1 1 0) [41][42][43][44], Pd(1 1 1) [42,43,45,[46][47][48][49][50][51][52][53], Rh(1 0 0) [54], Rh(1 1 0) [54], Rh(1 1 1) [54][55][56][57][58][59][60][61][62][63][64][65], Ir(1 1 1) [66], Ir(2 1 1) [67], Cu(0 0 1) [68], Ag(1 1 1) [69], Pd/Cu(1 1 1) [48], Fe/Rh(1 0 0) [55], Rh/CeO x (1 1 1) [70], Pd/MgO(1 0 0) [71,72], Pt-Rh/TiO 2 (1 1 0) [73]...…”

Section: No-co Reactionmentioning

confidence: 99%