A RAIRS and TPD investigation of the adsorption of CO on Pt{211}

Mukerji, R. J.; Bolina, Amandeep S.; Brown, Wendy A.

doi:10.1016/s0039-6028(03)00027-x

Cited by 50 publications

(79 citation statements)

References 23 publications

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“…As has been shown from studies on high-index Pt single crystal surfaces (Pt(112) [50,62,63], Pt(335) [50,64]), CO binding on step sites exhibit higher binding energy in CO TPD measurements and a lower vibrational wavenumber (t CO ) than CO bound in an atop fashion on terrace like sites. We exploit these differences in infrared and desorption signatures to quantify the fraction of step sites on Pt/SiO 2 surfaces as a function of Pt NP size (as determined via STM).…”

Section: Characterization Of Surface Sites Under Uhvmentioning

confidence: 79%

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

McClure

Goodman

2011

Top Catal

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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 Uhvmentioning

confidence: 79%

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

McClure

Goodman

2011

Top Catal

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“…6. Band assignment could be made from CO adsorption on single crystal surface, and the CO peak at 2078 cm À1 is assigned to atop CO molecules bonded to steps or kink sites of Pt surface [21][22][23]. Pre-adsorbed acetophenone resulted in a red shift of CO stretching by 10 cm À1 .…”

Section: Discussionmentioning

confidence: 99%

Hydrogen adsorption sites studied by carbon monoxide adsorption to explain the hydrogenation activity of benzene on Pd and Pt catalysts

Chen¹,

Lin²,

Chen³

2006

Applied Catalysis A: General

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“…Further evidence for the assignment of this peak to the desorption of NO from an O-NO complex comes from the observation that predosing the Pt͕211͖ surface with O atoms causes the size of this peak to increase, relative to the other TPD peaks, due to increased amounts of the O-NO complex on the surface. 32 The O-NO complex is thought to be bonded to the step edge of Pt͕211͖ as it forms via the bonding of an NO molecule to an O atom adsorbed in a step bridge site. 16 The only NO TPD peak remaining to be assigned is that labeled ␤ in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…Further evidence for the assignment of the ␤-NO TPD peak to recombinative desorption of N and O atoms comes from the observation that predosing the Pt͕211͖ surface with O atoms causes the size of the ␤-NO TPD peak to decrease 32 due to the blocking of NO dissociation by the preadsorbed O atoms. In addition, the desorption temperature of the ␤-NO peak decreases slightly with increasing NO exposure, from 424 K at low NO doses to 416 K at saturation.…”

Section: Resultsmentioning

confidence: 99%

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The influence of steps on the dissociation of NO on Pt surfaces: Temperature-programmed desorption studies of NO adsorption on Pt{211}

Mukerji

Bolina

Brown

2003

The Journal of Chemical Physics

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Article (Published Version) http://sro.sussex.ac.uk This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Temperature-programmed desorption ͑TPD͒ has been used to investigate the adsorption of NO on Pt͕211͖ at 300 K and 120 K. Results show that NO dissociation occurs readily on Pt͕211͖,a s evidenced by the observation of N 2 and N 2 O in the TPD spectrum. Following adsorption at 120 K three NO TPD peaks at 338, 416, and 503 K are observed, in agreement with previous observations. In combination with data acquired in a recent reflection absorption infrared spectroscopy and density functional theory investigation of NO/Pt͕211͖, these peaks are assigned to the desorption of NO from an O-NO complex, the recombinative desorption of N and O atoms, and to desorption of a step-bridged NO species, respectively. These assignments are in disagreement with previous work, where the high-temperature NO peak was assigned to the desorption of step bound NO and the two low-temperature peaks were assigned to the desorption of NO from terrace sites. TPD spectra recorded following adsorption at 300 K, with a heating rate of 1 K s Ϫ1 , show similar features to those recorded following 120 K adsorption. This is also in disagreement with previous observations, where only two NO TPD peaks were observed following adsorption at room temperature. This disagreement can be accounted for by the different heating rates used in the two experiments. The influence of steps on the dissociation of NO on

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A RAIRS and TPD investigation of the adsorption of CO on Pt{211}

Cited by 50 publications

References 23 publications

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

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

Hydrogen adsorption sites studied by carbon monoxide adsorption to explain the hydrogenation activity of benzene on Pd and Pt catalysts

The influence of steps on the dissociation of NO on Pt surfaces: Temperature-programmed desorption studies of NO adsorption on Pt{211}

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