Nitrogen dioxide adsorption on deuteroxylated titania (anatase)

Kantcheva, Margarita; Bushev, V.; Hadjiivanov, Konstantin

doi:10.1039/ft9928803087

Cited by 61 publications

(54 citation statements)

References 6 publications

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“…The formation of water molecules has been confirmed by adsorption of NO 2 on deuterioxylated TiO 2 [56].…”

Section: Coadsorption Of No and Omentioning

confidence: 74%

“…Similar process (Eq. (5)) has been proposed to take place upon interaction of NO 2 with oxides containing basic OH groups such as titania (anatase) [56][57][58] and monoclinic zirconia [44,46]:…”

Section: Coadsorption Of No and Omentioning

confidence: 99%

“…Another possibility for the formation of nitrate species is through self-ionization of NO 2 on surface Lewis acid-base pairs according to the reaction [51,56,57]:…”

Section: Coadsorption Of No and Omentioning

confidence: 99%

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Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

Kantcheva

Çayırtepe

2006

Journal of Molecular Catalysis A: Chemical

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Surface species obtained during the adsorption of NO and NO/O 2 coadsorption at room temperature on Pd-free (WZ) and Pd-promoted tungstated zirconia (Pd/WZ) are identified by means of in situ FT-IR spectroscopy. The WZ and Pd/WZ samples have a tetragonal structure and contain randomly distributed mesoporous phase. Dispersed palladium(II) species are present in two different environments: (i) Pd 2+ ions, which have only Zr 4+ ions in their second coordination sphere and (ii) Pd 2+ ions, which are linked to both zirconium and tungsten ions via oxygen bridges. On the Pd/WZ sample, NO undergoes oxidation to various NO x species depending on the temperature. The compounds formed at room-temperature oxidation are adsorbed N 2 O 3 and products of its self-ionization, NO + and NO 2 − . In this process W(VI) is involved, being reduced to W(IV). At high temperature N 2 O 3 decomposes, restoring the W O species. Under these conditions, NO undergoes oxidation to NO 2 by the Pd(II) ions, which are reduced to Pd(I). The nitrosyls of Pd(I) display high thermal stability and do not disappear upon evacuation at 623 K. During NO/O 2 coadsorption on the Pd/WZ catalyst at room temperature, the amounts of surface nitrates and NO 2 /N 2 O 4 formed in the gas phase are significantly lower than those observed under identical conditions in the presence of tungstated zirconia. It is concluded that promotion of tungstated zirconia with palladium(II) suppresses the oxidation of NO by molecular oxygen at room temperature due to the elimination of acidic protons involved in the process.

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“…The formation of water molecules has been confirmed by adsorption of NO 2 on deuterioxylated TiO 2 [56].…”

Section: Coadsorption Of No and Omentioning

confidence: 74%

Section: Coadsorption Of No and Omentioning

confidence: 99%

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Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

Kantcheva

Çayırtepe

2006

Journal of Molecular Catalysis A: Chemical

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“…Similar interaction was observed to occur during the adsorption of NO 2 on titania (anatase). 33,34 Another possibility for the formation of nitrate species involves disproportionation of NO 2 on surface Lewis acid-base pairs according to the reaction 28,33 The N-O stretching frequency of nitrosonium ion adsorbed on surfaces is found at 2290-2102 cm -1 . 9,28,33-35 Spectrum b in Figure 6 displays a broad, poorly resolved absorption at approximately 2210 cm -1 , which loses intensity after evacuation at room temperature for 15 min and shifts to 2240 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

FTIR Spectroscopic Characterization of NO_xSpecies Adsorbed on ZrO₂and ZrO₂−SO₄^2-

Kantcheva

Ciftlikli

2002

J. Phys. Chem. B

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The nature of the NO x species produced during the adsorption of NO at room temperature and during its coadsorption with oxygen on pure and sulfated zirconia has been investigated by means of in situ FTIR spectroscopy. The adsorption of NO on both samples occurs through disproportionation leading to the formation of nitrous acid; water molecules; nitro species; and anionic nitrosyls, NO -. A mechanism for the formation of these adsorption forms is proposed. The NO -species are stable on the surface of zirconia, whereas on the sulfated sample, they are readily oxidized by the SO 4 2-groups. The process of NO disproportionation is favored by wet surfaces and occurs with participation of the tribridged (ZrO 2 ) and terminal (ZrO 2 -SO 4 2-) hydroxyl groups. Coadsorption of NO and O 2 on pure zirconia leads to the formation of various kinds of nitrate species. The presence of sulfate ions reduces the amount of surface nitrates and decreases their thermal stability. An analysis of the combination bands of the nitrate species shows that this spectral region can be used for structural identification of bidentate and bridged nitrates.

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“…[20][21][22] Previous infrared spectroscopic studies demonstrated that more than one type of hydroxyl group is consumed during the NO 2 reaction on TiO 2 . 22,23 However, the exact role of each type of OH on the adsorption and reaction of NO 2 on TiO 2 is still not clear. The present study aims to recognize the multiplicity of surface hydroxyls on TiO 2 and determine the significance of each hydroxyl species in NO 2 adsorption and reaction.…”

Section: Introductionmentioning

confidence: 99%

Structure–activity relationship of surface hydroxyl groups during NO₂ adsorption and transformation on TiO₂ nanoparticles

Liu

et al. 2017

Environ. Sci.: Nano

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The role of hydroxyl groups (OH) is significant in understanding the surface reactions on oxides. Here we combined spectroscopic experiments and theoretical calculations to reveal the role of OH in the heterogeneous reactions of NO 2 on TiO 2 nanoparticles with various crystal structures. The interaction between OH and NO 2 was determined to be a critical step, giving rise to the formation of surface HNO 3 . HNO 3 was found to be either a stable product on amorphous TiO 2 , or an important intermediate of nitrate on anatase due to its further reaction with nearby OH. The lack of surface OH on rutile limited its reactivity toward NO 2 . This study presents clear evidence that the reactivity of TiO 2 toward NO 2 greatly depends on the surface OH as well as the crystalline form. Considering the ubiquitous presence of TiO 2 nanoparticles in catalysts and in natural environments, our results could provide insights helpful to future research in both environmental catalysis and atmospheric chemistry.

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Nitrogen dioxide adsorption on deuteroxylated titania (anatase)

Cited by 61 publications

References 6 publications

Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

FTIR Spectroscopic Characterization of NO_xSpecies Adsorbed on ZrO₂and ZrO₂−SO₄^2-

Structure–activity relationship of surface hydroxyl groups during NO₂ adsorption and transformation on TiO₂ nanoparticles

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Nitrogen dioxide adsorption on deuteroxylated titania (anatase)

Cited by 61 publications

References 6 publications

Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

Routes of formation and composition of NOx complexes adsorbed on palladium-promoted tungstated zirconia

FTIR Spectroscopic Characterization of NOxSpecies Adsorbed on ZrO2and ZrO2−SO42-

Structure–activity relationship of surface hydroxyl groups during NO2 adsorption and transformation on TiO2 nanoparticles

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FTIR Spectroscopic Characterization of NO_xSpecies Adsorbed on ZrO₂and ZrO₂−SO₄^2-

Structure–activity relationship of surface hydroxyl groups during NO₂ adsorption and transformation on TiO₂ nanoparticles