Infra-red study of nitric oxide adsorption on magnesium oxide

Cerruti, Luigi; Modone, E.; Guglielminotti, E.; Borello, E.

doi:10.1039/f19747000729

Cited by 67 publications

(70 citation statements)

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“…Anionic nitrosyl species have been observed when NO is adsorbed on alkaline earth metal oxides such as MgO 29 and CaO, 30 on lanthanide metal oxides such as CeO 2 31 and La 2 O 3 , 27,32 and on TiO 2 . 28 The evacuation for 15 min at room temperature of all of the samples studied causes a slight increase in the intensities of the bands at 1680, 1605, 1325, and 1186 cm -1 due to adsorbed HNO 2 , H 2 O, NO 2 -, and NO -species, respectively (see Figure 2, spectra a and d, and Figure 5, spectra a and b).…”

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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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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“…following the oxidation of NO on a few MgO basic sites. [48][49][50] A partial decomposition of the brucitic layer during outgassing at 400 8C accounts for the presence of MgO in the system. Although chrysotile is generally reported to persist at temperatures higher than 400 8C, [51,52] the same behaviour was observed by some of us with a pure, synthetic chrysotile with a low iron content.…”

Section: Modification Induced In Surface Propertiesmentioning

confidence: 99%

A Biomimetic Approach to the Chemical Inactivation of Chrysotile Fibres by Lichen Metabolites

Turci

Favero‐Longo

Tomatis

et al. 2007

Chemistry A European J

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Some lichens were recently reported to modify the surface state of asbestos. Here we report some new insight on the physico-chemical modifications induced by natural chelators (lichen metabolites) on two asbestos samples collected in two different locations. A biomimetic approach was followed by reproducing in the laboratory the weathering effect of lichen metabolites. Norstictic, pulvinic and oxalic acid (0.005, 0.5 and 50 mM) were put in contact with chrysotile fibres, either in pure form (A) or intergrown with balangeroite, an iron-rich asbestiform phase (B). Mg and Si removal, measured by inductively coupled plasma atomic emission spectrometry (ICP-AES) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), reveals an incongruent dissolution for pure chrysotile (A), with Mg removal always exceeding that of Si, while chrysotile-balangeroite (B) follows a congruent dissolution pattern in all cases except in the presence of 50 mM oxalic acid. A much larger removal of Mg than Si in the solutions of 0.5 and 50 mM oxalic acid with chrysotile (A) suggests a structural collapse, which in the case of chrysotile-balangeroite (B) only occurs with 50 mM oxalic acid; in these cases both samples are converted into amorphous silica (as detected by X-ray diffraction (XRD)). Subsequent to incubation, some new phases (Fe(2)O(3), CaMg(CO(3))(2), Ca(C(2)O(4)) x H(2)O and Mg(C(2)O(4))2 x H(2)O), similar to those observed in the field, were detected by XRD and micro-Raman spectroscopy. The leaching effect of lichen metabolites also modifies the Fenton activity, a process widely correlated with asbestos pathogenicity: pure chrysotile (A) activity is reduced by 50 mM oxalic acid, while all lichen metabolites reduce the activity of chrysotile-balangeroite (B). The selective removal of poorly coordinated, highly reactive iron ions, evidenced by NO adsorption, accounts for the loss in Fenton activity. Such fibres were chemically close to the ones observed in the field. Chrysotile-rich rocks, colonised by lichens, could be exposed to a natural bioattenuation and considered as a transient environmental hazard.

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“…The N-O-H bending mode is expected to fall in the 1300-1200 cm −1 region but could be covered by the absorption due to lowfrequency components of the ν 3 split modes of the nitrate species. Anionic nitrosyl NO − species have been observed when NO is adsorbed on alkaline earth metal oxides such as MgO (19) and CaO (20) and on lanthanide metal oxides such as CeO 2 (21) The NO 2 produced by reaction [1] can interact with the surface OH groups, giving nitrate species (15,24). Indeed, the growth of nitrate bands with time is accompanied by development of a negative band at 3718 cm −1 in the OH stretching region and appearance of H-bonded hydroxyls (Fig.…”

Section: Tiomentioning

confidence: 99%

Identification, Stability, and Reactivity of NOx Species Adsorbed on Titania-Supported Manganese Catalysts

Kantcheva

2001

Journal of Catalysis

247

172

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The nature of the NO x species obtained on NO adsorption and its coadsorption with O 2 at room temperature on TiO 2 and MnO x /TiO 2 catalysts with two different manganese loadings has been studied by means of in situ Fourier transform infrared spectroscopy. In order to obtain information about the potentials of titania-supported manganese materials as catalysts for selective catalytic reduction (SCR) of NO by hydrocarbons, the stability and reactivity of the adsorbed NO x species toward decane has been investigated.

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Infra-red study of nitric oxide adsorption on magnesium oxide

Cited by 67 publications

References 1 publication

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

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

A Biomimetic Approach to the Chemical Inactivation of Chrysotile Fibres by Lichen Metabolites

Identification, Stability, and Reactivity of NOx Species Adsorbed on Titania-Supported Manganese Catalysts

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Infra-red study of nitric oxide adsorption on magnesium oxide

Cited by 67 publications

References 1 publication

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

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

A Biomimetic Approach to the Chemical Inactivation of Chrysotile Fibres by Lichen Metabolites

Identification, Stability, and Reactivity of NOx Species Adsorbed on Titania-Supported Manganese Catalysts

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

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