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Цыганенко, А. А.; Platero, E. Escalona; Areán, C. Otero; Garrone, Edoardo; Zecchina, Adriano

doi:10.1023/a:1019089309446

Cited by 65 publications

(58 citation statements)

References 29 publications

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“…They assigned those four bands to Na + -carbonyls on four different S II sites associated to different Al contents and positions. This assignment has also been given by Tsyganenko et al [34]. This assignment seems however to be inconsistent, in our opinion, with the exceedingly stronger intensity of the component at 2172 cm À1 observed at saturation, with respect to the other components assigned to species having virtually a similar probability.…”

Section: Adsorption Sites and S-bonded Co Adsorbed Speciessupporting

confidence: 66%

“…Low temperature [30][31][32][33][34][35] and room temperature [36] IR studies of CO adsorption on alkali-metal faujasites have been published. In this paper we report on our re-examination of the CO-NaFAU system and on a new study on the adsorption of hindered nitriles on NaX and NaY samples, in order to check if interactions similar to those observed on NaMOR are detectable on these systems.…”

Section: Introductionmentioning

confidence: 99%

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FT-IR study of the adsorption of carbon monoxide and of some nitriles on Na-faujasites: Additional insight on the formation of complex interactions

et al. 2006

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Section: Adsorption Sites and S-bonded Co Adsorbed Speciessupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

FT-IR study of the adsorption of carbon monoxide and of some nitriles on Na-faujasites: Additional insight on the formation of complex interactions

et al. 2006

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“…A further decarbonylation of the latter species to give Ca 2+ -CO has been suggested 28 to give rise to the lowcoverage stable band at 2201 cm -1 , in agreement with other reports. 34,35 It is worth mentioning that these authors 28 considered (i) the appearance of only one absorption band for the tri-and geminal carbonyl species to account for CO molecules behaving as independent oscillators (i.e., weakly adsorbed), and (ii) the independence of the location of the 2201 cm -1 band on the coverage to reveal that the adsorption sites (Ca 2+ ) are isolated.…”

Section: Heating In the Absence Of Hcl Vapor 311 The Bulkmentioning

confidence: 99%

Structural and Morphological Consequences of High-Temperature Treatments of Hydroxyapatite in the Absence or Presence of HCl Vapor

2005

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Hydroxyapatite [HAP; Ca5(PO4)3(OH)], a biocompatible, osteoconductive material, was perceived, in the present investigation, to mimic a healthy bone mineral. Structural and morphological properties of its bulk and surface were examined versus high-temperature (up to 900 degrees C) thermal treatments in air or wet HCl gas atmosphere, using thermogravimetry, X-ray powder diffractometry, N2 sorptiometry, scanning electron microscopy, X-ray energy dispersive spectroscopy, and ex- and in situ infrared spectroscopy. CO, CDCl3, and methylbutynol were used as infrared probe molecules. Results obtained revealed that, in the absence of HCl, the bulk crystalline structure and the chemical composition of HAP were stable during high-temperature treatments. The surface exposed isolated Lewis acid sites (Ca2+) and reactive base sites (O(x-) and/or OH-) that chemisorbed atmospheric CO2 molecules with the formation of surface carbonate species (CaCO3). It is assumed that surface OH groups may interact with atmospheric oxygen molecules, leading to the formation and incorporation of peroxide (O2(2-) species. In the atmosphere of wet HCl, HAP was shown to suffer loss of chemical integrity, facilitated by its carbonated domains, as well as disintegration (or erosion) of particle aggregates and creation of what appeared to be deep groves.

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“…K ) (A LF /A HF )( HF / LF ) (8) ln K ) -(∆H°/RT) + (∆S°/R) (9) ln(A LF /A HF ) ) -(∆H°/RT) + (∆S°/R) + ln( HF / LF ) (10) nificantly affect the isomerization enthalpy. An analysis of such factors has to await both detailed quantum chemical calculations and experimental measurements on other alkaline earth carbonyls.…”

Section: Sr(co) 2+mentioning

confidence: 99%

Spectroscopic and Thermodynamic Characterization of Strontium Carbonyls Formed upon Carbon Monoxide Adsorption on the Zeolite Sr−Y

et al. 2003

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The adsorption of CO on the faujasite-type zeolite Sr-Y generates four types of carbonyls: the Sr(CO) 2+ species, which has a characteristic IR absorption band at 2191 cm -1 ; the Sr(OC) 2+ species at 2095 cm -1 ; Sr(CO) 2 2+ , which has a single mode at 2187 cm -1 ; and Sr(CO, OC) 2+ , which has a mode at 2098 cm -1 . The use of a variable-temperature IR cell allowing the simultaneous measurements of temperature, pressure, and coverages (intensities) of CO species to be made has allowed the determination of the standard enthalpy and entropy of formation of each species, so obtaining a fairly thorough thermodynamic characterization of the CO/Sr-Y system. C-and O-bonded carbonyl species were found to be in a temperature-dependent isomerization equilibrium, which was also studied by means of variable-temperature IR spectroscopy.

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Cited by 65 publications

References 29 publications

FT-IR study of the adsorption of carbon monoxide and of some nitriles on Na-faujasites: Additional insight on the formation of complex interactions

FT-IR study of the adsorption of carbon monoxide and of some nitriles on Na-faujasites: Additional insight on the formation of complex interactions

Structural and Morphological Consequences of High-Temperature Treatments of Hydroxyapatite in the Absence or Presence of HCl Vapor

Spectroscopic and Thermodynamic Characterization of Strontium Carbonyls Formed upon Carbon Monoxide Adsorption on the Zeolite Sr−Y

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