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

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Temperature-programmed desorption of CO₂, formed by CO photooxidation on TiO₂ surface. / Mikhaylov, Ruslan V.; Nikitin, Konstantin V.; Glazkova, Nadezhda I.; Kuznetsov, Vyacheslav N.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 360, 01.06.2018, p. 255-261.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{08649888f77a47128a7cbd7ca685ac36,

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 (T-m) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the T-m value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with E-des = 1.15 +/- 0.05 eV and nu -= 0.32 +/- 0.02 cm(2) s(-1) for anatase and E-des = 1.24 +/- 0.05 eV and nu = 0.16 +/- 0.01 cm(2) 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, CHEMISORPTION, LEWIS-ACID, PHOTOCATALYTIC OXIDATION, ADSORPTION, H-2, BASE SITES, REDUCED TIO2(110), ANATASE, TITANIUM-DIOXIDE, CARBON-DIOXIDE",

author = "Mikhaylov, {Ruslan V.} and Nikitin, {Konstantin V.} and Glazkova, {Nadezhda I.} and Kuznetsov, {Vyacheslav N.}",

year = "2018",

month = jun,

day = "1",

doi = "10.1016/j.jphotochem.2018.04.055",

language = "English",

volume = "360",

pages = "255--261",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

issn = "1010-6030",

publisher = "Elsevier",

}

RIS

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 (T-m) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the T-m value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with E-des = 1.15 +/- 0.05 eV and nu -= 0.32 +/- 0.02 cm(2) s(-1) for anatase and E-des = 1.24 +/- 0.05 eV and nu = 0.16 +/- 0.01 cm(2) 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 (T-m) depends on the CO2 coverage: the lower is the CO2 amount, the higher is the T-m value. The CO2 TPD peak is well fitted with the second-order desorption kinetics with E-des = 1.15 +/- 0.05 eV and nu -= 0.32 +/- 0.02 cm(2) s(-1) for anatase and E-des = 1.24 +/- 0.05 eV and nu = 0.16 +/- 0.01 cm(2) 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

KW - CHEMISORPTION

KW - LEWIS-ACID

KW - PHOTOCATALYTIC OXIDATION

KW - ADSORPTION

KW - H-2

KW - BASE SITES

KW - REDUCED TIO2(110)

KW - ANATASE

KW - TITANIUM-DIOXIDE

KW - CARBON-DIOXIDE

UR - http://www.scopus.com/inward/record.url?scp=85046688891&partnerID=8YFLogxK

U2 - 10.1016/j.jphotochem.2018.04.055

DO - 10.1016/j.jphotochem.2018.04.055

M3 - Article

AN - SCOPUS:85046688891

VL - 360

SP - 255

EP - 261

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

ER -

ID: 28192664