Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy

Li, J; Xiong, Guang; Feng, Zhaochi; Liu, Z; Xin, Qi; Li, C

doi:10.1016/s1387-1811(00)00204-3

Cited by 83 publications

(77 citation statements)

References 28 publications

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“…The two spectra clearly suggest that the fluorescence can be avoided in the Raman spectra when the Raman spectra are placed in the UV region. Similar results were obtained for zeolites [6], alumina [7], coked catalysts [8], etc. In principle the sensitivity of Raman spectroscopy can be further increased by shifting the excitation laser from the visible region to the UV region, since the Raman scattering intensity is inversely proportional to λ 4 (where λ is the wavelength of the Raman scattering).…”

Section: Uv Raman Spectroscopy Applied To Catalyst Characterizationsupporting

confidence: 85%

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

2003

Journal of Catalysis

142

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Section: Uv Raman Spectroscopy Applied To Catalyst Characterizationsupporting

confidence: 85%

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

2003

Journal of Catalysis

142

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“…Raman spectrometry have been widely applied to the study of used catalysts (for instance, see [20][21][22]). Two linked phenomena are responsible for the catalyst deactivation: the structural evolution of the active phase and the deposit of carbonaceous compounds on the catalyst surface.…”

Section: Used Catalysts Characterizationmentioning

confidence: 99%

Monitoring Hydrotreating Catalysts Synthesis and Deactivation using Raman Spectrometry

Digne¹,

Marchand²,

Bourges³

2007

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Suivi de la synthèse et de la désactivation des catalyseurs d'hydrotraitement par spectrométrie Raman -La spectrométrie Raman est devenue une technique de caractérisation populaire pour les catalyseurs d'hydrotraitement : elle fournit des informations importantes sur la structure chimique, au cours du cycle de synthèse du catalyseur. Les phénomènes physico-chimiques se déroulant sur la surface du catalyseur peuvent être suivis par cette technique. Cet article décrit quelques exemples où la spectrométrie Raman a permis d'évaluer l'impact de paramètres expérimentaux (choix de précur-seurs métalliques, présence d'impureté, influence de la température de calcination, dépôt de coke) sur la structure du catalyseur. Abstract -Monitoring Hydrotreating Catalysts Synthesis and Deactivation using Raman Spectrometry -Raman spectrometry has become a popular characterization technique for hydrotreatment catalysts: it provides important information on chemical structures along all the synthesis cycle

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“…Since 1995, we have carried out the UV Raman spectroscopic studies of catalysts 7 and studied sulfated zirconia, 8 coked catalysts, 9,10 zeolites and alumina-supported oxides 11 -13 that all have a strong fluorescence background in their visible Raman spectra, but are free of fluorescence interference in the UV Raman spectra. Hence UV Raman spectroscopy opens up the possibility of characterizing those catalysts which are difficult to study by conventional visible Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

UV Raman spectroscopic study on the phase transformation of ZrO₂, Y₂O₃–ZrO₂ and SO₄²⁻/ZrO₂

2002

J Raman Spectroscopy

178

108

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The phase evolution of zirconia (ZrO 2 ), sulfated zirconia (SO 4 2− /ZrO 2 ) and yttrium oxide incorporated zirconia (Y 2 O 3 -ZrO 2 ) from the tetrahedral phase to the monoclinic phase was studied using UV Raman spectroscopy, visible Raman spectroscopy and x-ray diffraction (XRD). It is clearly observed that there are discrepancies between the results from the UV Raman spectra, visible Raman spectra and XRD patterns. The phase change from tetragonal to monoclinic is always earlier or at lower calcination temperatures as observed by UV Raman spectroscopy than by visible Raman spectroscopy and XRD. UV Raman spectroscopy is found to be more sensitive at the surface region while visible Raman spectroscopy and XRD supply the information mainly from the bulk. The inconsistency in the results from the three techniques suggests that the phase transformation of zirconia starts from its surface region and then gradually develops into its bulk. For SO 4 2− /ZrO 2 and Y 2 O 3 -ZrO 2 , the transformation from the tetragonal to the monoclinic phase is significantly retarded owing to the presence of the sulfated groups and the yttrium oxide. Particularly, the tetragonal phase of Y 2 O 3 -ZrO 2 can be maintained up to 800 • C although its phase at the surface region changed into monoclinic at 500 • C.

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Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy

Cited by 83 publications

References 28 publications

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

Monitoring Hydrotreating Catalysts Synthesis and Deactivation using Raman Spectrometry

UV Raman spectroscopic study on the phase transformation of ZrO₂, Y₂O₃–ZrO₂ and SO₄²⁻/ZrO₂

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Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy

Cited by 83 publications

References 28 publications

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

Identifying the isolated transition metal ions/oxides in molecular sieves and on oxide supports by UV resonance Raman spectroscopy

Monitoring Hydrotreating Catalysts Synthesis and Deactivation using Raman Spectrometry

UV Raman spectroscopic study on the phase transformation of ZrO2, Y2O3–ZrO2 and SO42−/ZrO2

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UV Raman spectroscopic study on the phase transformation of ZrO₂, Y₂O₃–ZrO₂ and SO₄²⁻/ZrO₂