Preparations and characterization of lanthana catalysts: study of their activity in CO/H2 reactions

Andriamasinoro, D.; Kieffer, R.; Kiennemann, A.; Rehspringer, Jean‐Luc; Poix, P.; Vallet, Ana; Lavalley, Jean‐Claude

doi:10.1007/bf01105702

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…In addition, it was found that polydentate carbonate could be formed when the CO 2 adsorption was performed on bulk La 2 O 3 . 64 The adsorption heat evolved from the CO 2 interaction was found to have resulted not only from the adsorption on basic surface sites but also from its reaction with bulk La 2 O 3 . 65 Since the two characteristic FTIR bands at 1490 and 1400 cm -1 , which have been attributed to the formation of polydentate carbonates, 64,66 are not observed in our study, this result further confirms that La 2 O 3 has been highly dispersed on the surface of MCM-41.…”

Section: Resultsmentioning

confidence: 97%

“…64 The adsorption heat evolved from the CO 2 interaction was found to have resulted not only from the adsorption on basic surface sites but also from its reaction with bulk La 2 O 3 . 65 Since the two characteristic FTIR bands at 1490 and 1400 cm -1 , which have been attributed to the formation of polydentate carbonates, 64,66 are not observed in our study, this result further confirms that La 2 O 3 has been highly dispersed on the surface of MCM-41. As bulk La 2 O 3 is not present on LaM materials, polydentate carbonates cannot be formed by interaction with bulk acidic materials.…”

Section: Resultsmentioning

confidence: 97%

“…The weakly adsorbed CO 2 required for the formation of bicarbonate associated with weak basic sites (which produce C−OH bending mode at 1220 cm -1 as well as symmetric and asymmetric O−C−O stretching modes at 1480 and 1650 cm -1 , respectively) is not observed on the FTIR spectra; this is because the spectra were recorded under high vacuum which might have removed the weakly adsorbed CO 2 species. In addition, it was found that polydentate carbonate could be formed when the CO 2 adsorption was performed on bulk La 2 O 3 . The adsorption heat evolved from the CO 2 interaction was found to have resulted not only from the adsorption on basic surface sites but also from its reaction with bulk La 2 O 3 .…”

Section: Resultsmentioning

confidence: 97%

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CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃

2004

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Moderate basic sites could be created onto mesoporous Si-MCM-41 materials by postsynthesis modification with highly dispersed La2O3. The La2O3-modified MCM-41 materials (designated here as LaM) have been characterized by Fourier transform infrared spectroscopy, temperature-programmed desorption, X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and N2 adsorption/desorption and have been tested as model adsorbents for CO2 adsorption. XRD and N2 adsorption results showed that all LaM materials still maintained their uniform hexagonal mesoporous structure even after postsynthesis modification with La2O3 loading up to 20 wt %. Although the surface area, pore size, and pore volume of LaM materials decreased with increasing La2O3 loading, their capacity for CO2 storage could be significantly improved when La2O3 loading was increased from 0 to 10 wt %. Unidentate and bidentate carbonates have been identified by in situ FTIR as the two types of CO2 species adsorbed on LaM surface. The LaM material also possesses good thermal stability, allowing the model adsorbent to be regenerated at high temperature and recyclable.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

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CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃

2004

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Vibrational Spectroscopy in the Study of Oxide (Excluding Zeolites) and Sulfide Catalysts

Payen

Grimblot

Lavalley³

et al. 2001

Handbook of Vibrational Spectroscopy

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The sections in this article are Introduction Infrared Spectroscopy IR Characterization of Surface Properties of Metal Oxides Information Deriving from the Activated Oxide Spectra Lattice Vibrations Surface Oxide Sites Identification of Main Impurities in Metal Oxides Electronic Transitions Hydroxyl Groups Information Deriving from Probe Adsorption Acidity Basicity Cationic and Redox Sites: Use of Methanol as Probe for Local Arrangement and Oxidation State Determination of Surface Cationic Sites IR Characterization of Oxide and Sulfide Supported Catalysts Information Deriving from the Spectrum of the Activated Catalyst Information Deriving from Probe Molecule Adsorption CUS Characterization of the Sulfided Phase B rønsted Acid Site Characterization of the Sulfided Phase Site Transformation in the Presence of H 2 Surface Characterization and Catalysis Conclusion R aman Spectroscopy General Considerations Bulk Oxide Catalysts Supports Supported Oxides Nature of the Supported Oxide Chemical Processes Involved During Catalyst Synthesis Adsorption of Probe Molecules Surface B rønsted and Lewis Acid Sites Adsorption of Molecules Acting as Reagents Active Phase: Genesis and Characterization Genesis of the Hydrodesulfurization Active Phase Sulfided Catalyst Catalyst Reactivity Conclusion Concluding Remarks and Outlook

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Infrared spectrometric studies of the surface basicity of metal oxides and zeolites using adsorbed probe molecules

1996

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Preparations and characterization of lanthana catalysts: study of their activity in CO/H2 reactions

Cited by 11 publications

References 24 publications

CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃

CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃

Vibrational Spectroscopy in the Study of Oxide (Excluding Zeolites) and Sulfide Catalysts

Infrared spectrometric studies of the surface basicity of metal oxides and zeolites using adsorbed probe molecules

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Preparations and characterization of lanthana catalysts: study of their activity in CO/H2 reactions

Cited by 11 publications

References 24 publications

CO2 Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La2O3

CO2 Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La2O3

Vibrational Spectroscopy in the Study of Oxide (Excluding Zeolites) and Sulfide Catalysts

Infrared spectrometric studies of the surface basicity of metal oxides and zeolites using adsorbed probe molecules

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Product

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About

CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃

CO₂ Adsorption over Si-MCM-41 Materials Having Basic Sites Created by Postmodification with La₂O₃