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Kinetics of multi-step redox processes by time-resolved In situ X-ray diffraction

Lukas Buelens (UGent) , Vladimir Galvita (UGent) , Hilde Poelman (UGent) , Christophe Detavernier (UGent) and Guy Marin (UGent)
(2016) CHEMIE INGENIEUR TECHNIK. 88(11). p.1684-1692
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Abstract
The kinetics of redox reactions of iron oxide in oxygen carrier 50Fe(2)O(3)/MgAl2O4 are examined using different time-resolved techniques. Reduction kinetics are studied by H-2 temperature-programmed reduction (H-2-TPR) monitored by time-resolved in situ XRD. In contrast to conventional TPR, in situ XRD distinguishes the three-stage reduction of Fe2O3 -> Fe3O4 -> FeO -> Fe. It also shows that the oxidation of Fe -> Fe3O4 by CO2 has no intermediate crystalline phases, explaining why its kinetics can easily be investigated by conventional CO2 temperature-programmed oxidation (CO2-TPO). A shrinking core model which takes into account solid state diffusion allows describing the experimental data.
Keywords
LOW-TEMPERATURE REDUCTION, IRON-OXIDES, TPR DATA, MECHANISM, HYDROGEN, INTERCALATION, OXIDATION, H-2, CUO-CEO2/AL2O3, CATALYST, Chemical looping, CO2 conversion, Iron oxide, Kinetics, Oxidation, Reduction, Time-resolved in situ XRD

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Chicago
Buelens, Lukas, Vladimir Galvita, Hilde Poelman, Christophe Detavernier, and Guy Marin. 2016. “Kinetics of Multi-step Redox Processes by Time-resolved In Situ X-ray Diffraction.” Chemie Ingenieur Technik 88 (11): 1684–1692.
APA
Buelens, Lukas, Galvita, V., Poelman, H., Detavernier, C., & Marin, G. (2016). Kinetics of multi-step redox processes by time-resolved In situ X-ray diffraction. CHEMIE INGENIEUR TECHNIK, 88(11), 1684–1692.
Vancouver
1.
Buelens L, Galvita V, Poelman H, Detavernier C, Marin G. Kinetics of multi-step redox processes by time-resolved In situ X-ray diffraction. CHEMIE INGENIEUR TECHNIK. 2016;88(11):1684–92.
MLA
Buelens, Lukas, Vladimir Galvita, Hilde Poelman, et al. “Kinetics of Multi-step Redox Processes by Time-resolved In Situ X-ray Diffraction.” CHEMIE INGENIEUR TECHNIK 88.11 (2016): 1684–1692. Print.
@article{8510073,
  abstract     = {The kinetics of redox reactions of iron oxide in oxygen carrier 50Fe(2)O(3)/MgAl2O4 are examined using different time-resolved techniques. Reduction kinetics are studied by H-2 temperature-programmed reduction (H-2-TPR) monitored by time-resolved in situ XRD. In contrast to conventional TPR, in situ XRD distinguishes the three-stage reduction of Fe2O3 -{\textrangle} Fe3O4 -{\textrangle} FeO -{\textrangle} Fe. It also shows that the oxidation of Fe -{\textrangle} Fe3O4 by CO2 has no intermediate crystalline phases, explaining why its kinetics can easily be investigated by conventional CO2 temperature-programmed oxidation (CO2-TPO). A shrinking core model which takes into account solid state diffusion allows describing the experimental data.},
  author       = {Buelens, Lukas and Galvita, Vladimir and Poelman, Hilde and Detavernier, Christophe and Marin, Guy},
  issn         = {0009-286X},
  journal      = {CHEMIE INGENIEUR TECHNIK},
  keyword      = {LOW-TEMPERATURE REDUCTION,IRON-OXIDES,TPR DATA,MECHANISM,HYDROGEN,INTERCALATION,OXIDATION,H-2,CUO-CEO2/AL2O3,CATALYST,Chemical looping,CO2 conversion,Iron oxide,Kinetics,Oxidation,Reduction,Time-resolved in situ XRD},
  language     = {eng},
  number       = {11},
  pages        = {1684--1692},
  title        = {Kinetics of multi-step redox processes by time-resolved In situ X-ray diffraction},
  url          = {http://dx.doi.org/10.1002/cite.201600057},
  volume       = {88},
  year         = {2016},
}

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