Syngas production from methane and air via a redox process using Ce–Fe mixed oxides as oxygen carriers

Li, Kongzhai; Wang, Hua; Wei, Yonggang; Yan, Deyue

doi:10.1016/j.apcatb.2010.04.018

Cited by 186 publications

(126 citation statements)

References 44 publications

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“…Moreover, Liu et al [38] described in the Raman spectra of Zr-modified CeO 2 solids, not only the presence of a band around 306 cm (Figure 3, inset) suggesting its structural modification. Li et al [27] have reported similar bands in the Raman spectra of a Ce 0.7 Fe 0.3 O 2-δ solid, which they ascribed to Fe 2 O 3 . De Faria et al in their Raman study of iron oxides and oxyhydroxides, observed changes in the relative intensity of Raman signals in natural and synthetic hematite due to changes in the crystallinity of the solids which generates changes in the sample orientation and in the band polarization behavior [35].…”

Section: Raman Spectroscopymentioning

confidence: 62%

“…We have shown in a previous work that the segregation of α-Fe 2 O 3 was detected for iron contents higher than 10 atomic% in a series of Ce-Fe mixed oxides synthesized by a pseudo solgel method through the decomposition of the cerium and iron propionates [10]. In the same sense, Li et al [27] also reported the 10 atomic% Fe as the maximum iron content able to form the Ce-Fe solid solution without segregation of iron oxides, in a series of mixed oxides prepared by co-precipitation with ammonia at pH around 8-10 [27]. Pérez-Alonso et al [14] also studied the Ce-Fe mixed system synthesized by coprecipitation with NH 4 OH.…”

Section: Xrdmentioning

confidence: 75%

“…So, and taking into account the literature data cited above, the microemulsions methodology seems to favor a more stable and homogenous contact between Ce and Fe that other more conventional preparation methods, allowing to produce Ce-Fe solid solutions with higher iron contents [10,11,14,27].…”

Section: Xrdmentioning

confidence: 99%

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Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

Laguna

Centeno

Boutonnet

et al. 2011

Applied Catalysis B: Environmental

156

126

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A series of Ce-Fe mixed oxides as well as the pure oxides were synthesized by the microemulsions method. The solid solution formation was established for all the Fedoped systems and only a hardly noticeable segregation of α-Fe 2 O 3 was appreciated for the solid with the maximum iron content (50 Fe atomic%). The oxygen exchange is improved for all the Fe-doped systems; however the 10 Fe atomic% appears as the optimal iron content for achieving the maximum oxygen vacancies concentration and the higher reducibility efficiency. The CO oxidation (TOX, PROX) is especially achieved for the solids with the lower iron contents but with a superior oxygen vacancies proportion. These Ce-Fe systems prepared from microemulsions are very attractive to be considered as supports for depositing active phases capable of enhancing oxygen exchange ability of the whole system, allowing higher CO oxidation abilities.

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Section: Raman Spectroscopymentioning

confidence: 62%

Section: Xrdmentioning

confidence: 75%

See 1 more Smart Citation

Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

Laguna

Centeno

Boutonnet

et al. 2011

Applied Catalysis B: Environmental

156

126

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“…This is due to the fact, that Zr 4+ prefers a lower coordination with oxygen (e.g. Zr [7] in monoclinic ZrO 2 ) in contrast to Ce [8].…”

Section: Splitting Performance Depending On Thementioning

confidence: 82%

“…Today, syngas is mainly produced by steam or dry (CO 2 ) reforming or partial oxidation of fossil resources, mainly natural gas, accompanied by a substantial emission of greenhouse gases [5][6][7]. For a transition away from fossil energy, several processes have been developed that produce syngas from renewable sources (CO 2 , water) employing solar energy to cover the reaction heat [8,9].…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Zirconia-Doped Ceria for Thermochemical Production of Solar Fuel

Call¹,

Roeb²,

Schmücker³

et al. 2013

AJAC

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Developing an efficient redox material is crucial for thermochemical cycles that produce solar fuels (e.g. H 2 and CO), enabling a sustainable energy supply. In this study, zirconia-doped cerium oxide (Ce 1−x Zr x O 2 ) was tested in CO 2 -splitting cycles for the production of CO. The impact of the Zr-content on the splitting performance was investigated within the range 0 ≤ x < 0.4. The materials were synthesized via a citrate nitrate auto combustion route and subjected to thermogravimetric experiments. The results indicate that there is an optimal zirconium content, x = 0.15, improving the specific CO 2 -splitting performance by 50% compared to pure ceria. Significantly enhanced performance is observed for 0.15 ≤ x ≤ 0.225. Outside this range, the performance decreases to values of pure ceria. These results agree with theoretical studies attributing the improvements to lattice modification. Introducing Zr 4+ into the fluorite structure of ceria compensates for the expansion of the crystal lattice caused by the reduction of Ce 4+ to Ce 3+ . Regarding the reaction conditions, the most efficient composition Ce 0.85 Zr 0.15 O 2 enhances the required conditions by a temperature of 60 K or one order of magnitude of the partial pressure of oxygen p(O 2 ) compared to pure ceria. The optimal composition was tested in long-term experiments of one hundred cycles, which revealed declining splitting kinetics.

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Chemical Looping Combustion and Gasification

Fan

Chung

Bayham

et al. 2015

Handbook of Clean Energy Systems

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With the emerging challenge of climate change and the continued escalation of energy demands, innovative and flexible fuel conversion technologies are necessary and gaining recognition. Chemical looping technologies have the potential to not only reduce energy costs, but also to mitigate carbon emissions. Historically, the general concept of this reduction–oxidation mechanism has been suggested, but the process was never commercialized. Recent interests in carbon capture techniques have revitalized the adaptive chemical looping system. Chemical looping technologies can utilize both gaseous and solid fuels such as natural gas and coal, respectively, for power, hydrogen, or chemical generation. However, the success of technological adoption requires a thorough understanding of the types of chemical looping techniques, the design considerations, and the reactor modes of configurations. Current large‐scale testing units are examined with the hope for near‐term advancement and future commercial application.

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Syngas production from methane and air via a redox process using Ce–Fe mixed oxides as oxygen carriers

Cited by 186 publications

References 44 publications

Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

Fe-doped ceria solids synthesized by the microemulsion method for CO oxidation reactions

Thermogravimetric Analysis of Zirconia-Doped Ceria for Thermochemical Production of Solar Fuel

Chemical Looping Combustion and Gasification

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