Formation and Migration of Carbon Produced in the Dissociation of CO on Rh/ TiO2(110)-(1 × 2) Model Catalyst: A Scanning Tunneling Microscopy Study

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Abstract

Scanning tunneling microscopy (STM) completed by Auger-electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) measurements was applied for investigating the formation and thermal-induced migration of carbon nanoclusters produced by the decomposition of CO on Rh/TiO2(110)-(1 × 2) planar catalyst. The annealing of a clean TiO2(110)-(1 × 2) surface in a CO atmosphere (few millibar pressure) at 500 K results in the reconstruction of the (1 × 2) structure into the (1 × 4) arrangement. The same treatment of an Rh/ TiO2(110)-(1 × 2) catalyst containing well-separated Rh nanocrystallites of approximately 10 nm in diameter leads to the formation of 3D carbon nanoclusters of 1-2 nm size. A fraction of the carbon formed on Rh nanoparticles diffuses (probably also in cluster form) onto the support already at 500 K (spillover). In the temperature range of 700-1100 K the carbon clusters agglomerate and collapse into larger nanoparticles. The accumulation of carbon on the existing Rh nanoparticles occurs at above 1100 K. Annealing at 1300 K causes the recovering of the original morphology of the Rh/TiO2 (110)-(1 × 2) catalyst, suggesting a total gasification of the surface carbon. These processes are accompanied by the oxidation of surface carbon by the bulk oxygen of titania resulting in the formation of CO in the temperature range 800-1300 K.

Original languageEnglish
Pages (from-to)2506-2510
Number of pages5
JournalJournal of Physical Chemistry B
Volume104
Issue number11
Publication statusPublished - Mar 23 2000

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Scanning tunneling microscopy
Carbon Monoxide
scanning tunneling microscopy
Carbon
dissociation
catalysts
Catalysts
carbon
Nanoclusters
Nanoparticles
nanoclusters
nanoparticles
Annealing
Thermal desorption spectroscopy
Carbon clusters
Nanocrystallites
Auger electron spectroscopy
annealing
gasification
Gasification

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Formation and Migration of Carbon Produced in the Dissociation of CO on Rh/ TiO2(110)-(1 × 2) Model Catalyst: A Scanning Tunneling Microscopy Study",
abstract = "Scanning tunneling microscopy (STM) completed by Auger-electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) measurements was applied for investigating the formation and thermal-induced migration of carbon nanoclusters produced by the decomposition of CO on Rh/TiO2(110)-(1 × 2) planar catalyst. The annealing of a clean TiO2(110)-(1 × 2) surface in a CO atmosphere (few millibar pressure) at 500 K results in the reconstruction of the (1 × 2) structure into the (1 × 4) arrangement. The same treatment of an Rh/ TiO2(110)-(1 × 2) catalyst containing well-separated Rh nanocrystallites of approximately 10 nm in diameter leads to the formation of 3D carbon nanoclusters of 1-2 nm size. A fraction of the carbon formed on Rh nanoparticles diffuses (probably also in cluster form) onto the support already at 500 K (spillover). In the temperature range of 700-1100 K the carbon clusters agglomerate and collapse into larger nanoparticles. The accumulation of carbon on the existing Rh nanoparticles occurs at above 1100 K. Annealing at 1300 K causes the recovering of the original morphology of the Rh/TiO2 (110)-(1 × 2) catalyst, suggesting a total gasification of the surface carbon. These processes are accompanied by the oxidation of surface carbon by the bulk oxygen of titania resulting in the formation of CO in the temperature range 800-1300 K.",
author = "A. Berk{\'o} and T. B{\'i}r{\'o} and F. Solymosi",
year = "2000",
month = "3",
day = "23",
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T1 - Formation and Migration of Carbon Produced in the Dissociation of CO on Rh/ TiO2(110)-(1 × 2) Model Catalyst

T2 - A Scanning Tunneling Microscopy Study

AU - Berkó, A.

AU - Bíró, T.

AU - Solymosi, F.

PY - 2000/3/23

Y1 - 2000/3/23

N2 - Scanning tunneling microscopy (STM) completed by Auger-electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) measurements was applied for investigating the formation and thermal-induced migration of carbon nanoclusters produced by the decomposition of CO on Rh/TiO2(110)-(1 × 2) planar catalyst. The annealing of a clean TiO2(110)-(1 × 2) surface in a CO atmosphere (few millibar pressure) at 500 K results in the reconstruction of the (1 × 2) structure into the (1 × 4) arrangement. The same treatment of an Rh/ TiO2(110)-(1 × 2) catalyst containing well-separated Rh nanocrystallites of approximately 10 nm in diameter leads to the formation of 3D carbon nanoclusters of 1-2 nm size. A fraction of the carbon formed on Rh nanoparticles diffuses (probably also in cluster form) onto the support already at 500 K (spillover). In the temperature range of 700-1100 K the carbon clusters agglomerate and collapse into larger nanoparticles. The accumulation of carbon on the existing Rh nanoparticles occurs at above 1100 K. Annealing at 1300 K causes the recovering of the original morphology of the Rh/TiO2 (110)-(1 × 2) catalyst, suggesting a total gasification of the surface carbon. These processes are accompanied by the oxidation of surface carbon by the bulk oxygen of titania resulting in the formation of CO in the temperature range 800-1300 K.

AB - Scanning tunneling microscopy (STM) completed by Auger-electron spectroscopy (AES) and thermal desorption spectroscopy (TDS) measurements was applied for investigating the formation and thermal-induced migration of carbon nanoclusters produced by the decomposition of CO on Rh/TiO2(110)-(1 × 2) planar catalyst. The annealing of a clean TiO2(110)-(1 × 2) surface in a CO atmosphere (few millibar pressure) at 500 K results in the reconstruction of the (1 × 2) structure into the (1 × 4) arrangement. The same treatment of an Rh/ TiO2(110)-(1 × 2) catalyst containing well-separated Rh nanocrystallites of approximately 10 nm in diameter leads to the formation of 3D carbon nanoclusters of 1-2 nm size. A fraction of the carbon formed on Rh nanoparticles diffuses (probably also in cluster form) onto the support already at 500 K (spillover). In the temperature range of 700-1100 K the carbon clusters agglomerate and collapse into larger nanoparticles. The accumulation of carbon on the existing Rh nanoparticles occurs at above 1100 K. Annealing at 1300 K causes the recovering of the original morphology of the Rh/TiO2 (110)-(1 × 2) catalyst, suggesting a total gasification of the surface carbon. These processes are accompanied by the oxidation of surface carbon by the bulk oxygen of titania resulting in the formation of CO in the temperature range 800-1300 K.

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