Temperature-programmed desorption of CO2, formed by CO photooxidation on TiO2 surface

Research output

4 Citations (Scopus)

Abstract

Temperature-programmed desorption (TPD) spectra of CO2, remaining on the dehydroxylated powder TiO2 (anatase and rutile) surface after photooxidation of CO at T = 293 K, were analysed. It was shown that the CO2 TPD peak appears at T > 400 K, has a symmetric shape, and its maximum position (Tm) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the Tm value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with Edes = 1.15 ± 0.05 eV and ν = 0.32 ± 0.02 cm2 s−1 for anatase and Edes = 1.24 ± 0.05 eV and ν = 0.16 ± 0.01 cm2 s−1 for rutile. The desorption process can be interpreted as monomolecular desorption of carbonate species with two types of precursor states: 1) “over an empty site” and 2) “over a filled site”. It was supposed that CO2 thermal desorption resulted from migration of strongly bonded carbonate species (CO3) along the surface (via the precursor state “over an empty site”) and interaction of them (desorption from precursor state “over a filled site”).

Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume360
DOIs
Publication statusPublished - 1 Jun 2018

Fingerprint

Photooxidation
photooxidation
Carbon Monoxide
Temperature programmed desorption
Desorption
desorption
Carbonates
Titanium dioxide
Thermal desorption
temperature
anatase
rutile
Powders
carbonates
Kinetics
titanium dioxide
kinetics

Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

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title = "Temperature-programmed desorption of CO2, formed by CO photooxidation on TiO2 surface",
abstract = "Temperature-programmed desorption (TPD) spectra of CO2, remaining on the dehydroxylated powder TiO2 (anatase and rutile) surface after photooxidation of CO at T = 293 K, were analysed. It was shown that the CO2 TPD peak appears at T > 400 K, has a symmetric shape, and its maximum position (Tm) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the Tm value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with Edes = 1.15 ± 0.05 eV and ν = 0.32 ± 0.02 cm2 s−1 for anatase and Edes = 1.24 ± 0.05 eV and ν = 0.16 ± 0.01 cm2 s−1 for rutile. The desorption process can be interpreted as monomolecular desorption of carbonate species with two types of precursor states: 1) “over an empty site” and 2) “over a filled site”. It was supposed that CO2 thermal desorption resulted from migration of strongly bonded carbonate species (CO3) along the surface (via the precursor state “over an empty site”) and interaction of them (desorption from precursor state “over a filled site”).",
keywords = "Carbon dioxide, Carbonate, Desorption with precursor intermediates, Temperature-programmed desorption, Titania",
author = "Mikhaylov, {Ruslan V.} and Nikitin, {Konstantin V.} and Glazkova, {Nadezhda I.} and Kuznetsov, {Vyacheslav N.}",
year = "2018",
month = "6",
day = "1",
doi = "10.1016/j.jphotochem.2018.04.055",
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journal = "Journal of Photochemistry and Photobiology A: Chemistry",
issn = "1010-6030",
publisher = "Elsevier",

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TY - JOUR

T1 - Temperature-programmed desorption of CO2, formed by CO photooxidation on TiO2 surface

AU - Mikhaylov, Ruslan V.

AU - Nikitin, Konstantin V.

AU - Glazkova, Nadezhda I.

AU - Kuznetsov, Vyacheslav N.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Temperature-programmed desorption (TPD) spectra of CO2, remaining on the dehydroxylated powder TiO2 (anatase and rutile) surface after photooxidation of CO at T = 293 K, were analysed. It was shown that the CO2 TPD peak appears at T > 400 K, has a symmetric shape, and its maximum position (Tm) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the Tm value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with Edes = 1.15 ± 0.05 eV and ν = 0.32 ± 0.02 cm2 s−1 for anatase and Edes = 1.24 ± 0.05 eV and ν = 0.16 ± 0.01 cm2 s−1 for rutile. The desorption process can be interpreted as monomolecular desorption of carbonate species with two types of precursor states: 1) “over an empty site” and 2) “over a filled site”. It was supposed that CO2 thermal desorption resulted from migration of strongly bonded carbonate species (CO3) along the surface (via the precursor state “over an empty site”) and interaction of them (desorption from precursor state “over a filled site”).

AB - Temperature-programmed desorption (TPD) spectra of CO2, remaining on the dehydroxylated powder TiO2 (anatase and rutile) surface after photooxidation of CO at T = 293 K, were analysed. It was shown that the CO2 TPD peak appears at T > 400 K, has a symmetric shape, and its maximum position (Tm) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the Tm value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with Edes = 1.15 ± 0.05 eV and ν = 0.32 ± 0.02 cm2 s−1 for anatase and Edes = 1.24 ± 0.05 eV and ν = 0.16 ± 0.01 cm2 s−1 for rutile. The desorption process can be interpreted as monomolecular desorption of carbonate species with two types of precursor states: 1) “over an empty site” and 2) “over a filled site”. It was supposed that CO2 thermal desorption resulted from migration of strongly bonded carbonate species (CO3) along the surface (via the precursor state “over an empty site”) and interaction of them (desorption from precursor state “over a filled site”).

KW - Carbon dioxide

KW - Carbonate

KW - Desorption with precursor intermediates

KW - Temperature-programmed desorption

KW - Titania

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