Fe-Ca interactions in Fe-based/CaO catalyst/sorbent for CO2 sorption and hydrogen production from toluene steam reforming

Zamboni, Ingrid; Courson, Claire; Kiennemann, A.

doi:10.1016/j.apcatb.2016.10.024

Cited by 104 publications

(36 citation statements)

References 43 publications

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“…This reaction route involved dehydrogenation, demethylation, benzene ring opening, and aggregation of benzene ring fragments to form 1H‐indene,1‐ethylidese. Different from the conclusion of a previous investigation, reaction route 2 indicated that Ca 2 Fe 2 O 5 could not only catalyze toluene though dealkylation reaction but also had considerable catalysis ability for CC bond breaking of benzene ring. 3) Reaction routes 3 played important role in Case 8 and revealed formation mechanism of biphenyl, where demethylation of toluene was suggested.…”

Section: Resultscontrasting

confidence: 81%

“…Ca 2 Fe 2 O 5 was observed as iron catalysis component in Ca–Fe and Ca–Al–Fe, verifying that sol–gel method was favorable to form Ca 2 Fe 2 O 5 . This compound would be favorable for tar reduction, coke elimination, and WGS reaction . Chemical components obtained by XRD analyses were also adopted to evaluate CaO contents in different absorbents.…”

Section: Resultsmentioning

confidence: 81%

“…Di Felice et al confirmed that Ca 2 Fe 2 O 5 obviously enhanced toluene conversion and reduced coke deposition . Zamboni et al suggested that Ca 2 Fe 2 O 5 catalyzed toluene mainly though dealkylation reaction but it had weak ability of catalytic breaking for CC bonds of benzene ring . However, Huang et al synthesized an absorbent involving Ca 2 Fe 2 O 5 , which showed reactivity to promote polycyclic aromatic hydrocarbons (PAHs) decomposition and reduced reactivity loss of CaO .…”

Section: Introductionmentioning

confidence: 99%

“…However, Huang et al synthesized an absorbent involving Ca 2 Fe 2 O 5 , which showed reactivity to promote polycyclic aromatic hydrocarbons (PAHs) decomposition and reduced reactivity loss of CaO . In addition, Ca 2 Fe 2 O 5 could also transfer oxygen of H 2 O through its oxygen vacancy which oxidized CO to CO 2 and deoxidized H 2 O to H 2 with unchanged valence state of Fe …”

Section: Introductionmentioning

confidence: 99%

“…Little literature has focused on cyclic carbonation reactivity and mechanical strength of hybrid absorbent containing iron catalysis component. Zamboni et al found that the cyclic carbonation conversion of CaO in Fe–Ca synthetic absorbent decreased from over 60% to below 45% after seven cycles. There is a need to verify if Ca 12 Al 14 O 33 is still efficient to promote cyclic CO 2 capture performance and mechanical strength for Fe–Ca synthetic absorbent .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Han

Liu

Yuan³

et al. 2020

Energy Tech

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A two‐step sol–gel method is adopted to prepare an iron–calcium hybrid absorbent (Ca–Al–Fe) integrating iron catalysis component and inert support with CaO for calcium looping gasification. Effects of Ca–Al–Fe on cyclic CO2 capture reactivity, mechanical strength, and enhanced reforming of biomass tar model component (toluene) are investigated by comparing with three reference absorbents. Results show that main components of Ca–Al–Fe are CaO, mayenite (Ca12Al14O33), and brownmillerite (Ca2Fe2O5). Ca12Al14O33 plays key roles in keeping stable cyclic carbonation reactivity and significantly promotes mechanical strength of the novel absorbent. In comparison with other absorbents without coupling Ca12Al14O33 or Ca2Fe2O5, Ca–Al–Fe approaches the highest toluene conversion (around 60%) and has the lowest coke deposition (12.2 mg g−1), due to the synergetic influences of Ca2Fe2O5 and Ca12Al14O33, which significantly promotes hydrogen production while reducing CO2 yield in reforming syngas. In addition, influences of reaction conditions such as iron loading, reaction temperature, molar ratio of H2O to carbon in toluene, and absorbent particle size on toluene reforming are examined in the presence of Ca–Al–Fe. Potential reaction routes of toluene reforming are also analyzed and discussed.

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Section: Resultscontrasting

confidence: 81%

Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Han

Liu

Yuan³

et al. 2020

Energy Tech

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Pt–calcium cobaltate enables sorption‐enhanced steam reforming of glycerol coupled with chemical‐looping CH₄ combustion

Dang

et al. 2021

AIChE Journal

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Sorption-enhanced steam reforming (SESR) process is usually highly energy intensive in producing high-purity hydrogen. Herein, the sorbent decarbonation was conducted in the presence of O 2 to enable the exothermic reaction between CaO and CoO x to form calcium cobaltate (CCO). By utilizing CCO as oxygen carrier (OC), the chemicallooping methane combustion was employed prior to the SESR of glycerol (SESRG), by which CCO was prereduced to Co catalysts and CaO sorbent, thereby significantly improving the H 2 yield from SESRG. With a Pt-doped CCO acting as precatalyst, CO 2 sorbent, and OC, we realized 70% CH 4 conversion and 96 vol% H 2 with 120% yield (based on glycerol) for 20 cycles, and the excess H 2 was due to steam gasification of coke. The promoting effects of Pt toward CH 4 conversion and H 2 production were rationalized by CH 4 temperature-programmed reduction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. Our results demonstrate the feasibility of process integration enabled by multifunctional materials.

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Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

Han

et al. 2021

Int J Energy Res

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Summary Promoting multicycle CO2 absorption ability and mechanical strength while enhancing heavy tar elimination performance of calcium‐based absorbents is a significant challenge for calcium looping gasification (CLG). A synthesized absorbent Fe/Ca‐Al was developed by an impregnation method consisting of two steps, during which an inert support and an iron catalytic component were integrated with calcium oxide (CaO). Fe/Ca‐Al was compared with three other candidate absorbents in terms of their basic properties and performances. Results indicated that the major components of the synthesized Fe/Ca‐Al were CaO, mayenite (Ca12Al14O33), and Ca2Fe2O5. The CO2 absorption ability of Fe/Ca‐Al gradually increased within 10 carbonation–calcination cycles and the mechanical strength was apparently promoted by the component Ca12Al14O33. Fe/Ca‐Al approached the largest conversion for the heavy tar model component 1‐methylnaphthalene (70.6%), the highest H2 yield (0.18 mol/[hr·g]), and the least coke deposition (8.18 mg/g) during reforming. The synergistic effects of Ca12Al14O33 and Ca2Fe2O5 on the performance of Fe/Ca‐Al were analyzed. The effects of the mass ratio Fe/CaO, temperature of reforming reaction, molar ratio of S/C in tar, and the absorbent particle size on the reforming performance of heavy tar were also explored. The results of this study should provide useful information and possible solutions for CLG to overcome development obstacles. Novelty Statement The present work simultaneously addresses the key challenges of CaO‐based absorbents, including not only cyclic carbonation reactivity and mechanical strength of the absorbents but also heavy tar reduction performance and the influence of different reaction conditions, which are rarely reported in the literature. A synthesized iron‐calcium absorbent is developed by a two‐step impregnation method, which is beneficial to enhance biomass heavy tar (such as PAH) reduction, cyclic CO2 capture, and mechanical strength of the absorbent for hydrogen production in calcium looping gasification.

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Fe-Ca interactions in Fe-based/CaO catalyst/sorbent for CO2 sorption and hydrogen production from toluene steam reforming

Cited by 104 publications

References 43 publications

Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Pt–calcium cobaltate enables sorption‐enhanced steam reforming of glycerol coupled with chemical‐looping CH₄ combustion

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation

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Fe-Ca interactions in Fe-based/CaO catalyst/sorbent for CO2 sorption and hydrogen production from toluene steam reforming

Cited by 104 publications

References 43 publications

Catalytic Toluene Reforming with In Situ CO2 Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Catalytic Toluene Reforming with In Situ CO2 Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Pt–calcium cobaltate enables sorption‐enhanced steam reforming of glycerol coupled with chemical‐looping CH4 combustion

Promoted calcium looping H 2 production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO 2 absorbent prepared by impregnation

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Product

Resources

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Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Catalytic Toluene Reforming with In Situ CO₂ Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production

Pt–calcium cobaltate enables sorption‐enhanced steam reforming of glycerol coupled with chemical‐looping CH₄ combustion

Promoted calcium looping H ₂ production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO ₂ absorbent prepared by impregnation