Enhanced hydrogen production by in situ CO2 removal on CaCeZrOx nanocrystals

Sultana, Kazi Saima; Chen, De

doi:10.1016/j.cattod.2011.04.019

Cited by 43 publications

(14 citation statements)

References 46 publications

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“…The typical profiles of molar fractions (dry basis) of various species at the outlet of the reactor are given in Supporting Information Figure S4. Three distinct regions, prebreakthrough, breakthrough, and postbreakthrough, are observed as usual . The molar fractions of H 2 , CH 4 , CO, and CO 2 during the prebreakthrough period are measured to be 95.0, 0.6, 2.3, and 2.1%, respectively, which agree well with the corresponding equilibrium molar fractions (by thermodynamic calculation under the same experimental condition), being 94.5, 0.6, 2.4, and 2.5%, respectively.…”

Section: Resultssupporting

confidence: 81%

“…Most investigations on the SESMR process are conducted using individual catalyst and sorbent particles, that is, catalyst and sorbent (two different particles) are physically mixed and then loaded into a reactor . CaO is the most commonly employed sorbent due to its low cost, wide availability, high CO 2 capture capacity, and high carbonation rate .…”

Section: Introductionmentioning

confidence: 99%

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Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming

Zhou

Zhao

et al. 2014

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com)Ni/CaO-Al 2 O 3 bifunctional catalysts with different CaO/Al 2 O 3 mass ratios were prepared by a sol-gel method and applied to the sorption-enhanced steam methane reforming (SESMR) process. The catalysts consisted mainly of Ni, CaO and Ca 5 Al 6 O 14 . The catalyst structure depended strongly on the CaO/Al 2 O 3 mass ratio, which in turn affected the CO 2 capture capacity and the catalytic performance. The catalyst with a CaO/Al 2 O 3 mass ratio of 6 or 8 possessed the highest surface area, the smallest Ni particle size, and the most uniform distribution of Ni, CaO, and Ca 5 Al 6 O 14 . During 50 consecutive SESMR cycles at a steam/methane molar ratio of 2, the thermodynamic equilibrium was achieved using the catalyst with a CaO/Al 2 O 3 mass ratio of 6, and H 2 concentration profiles for all the 50 cycles almost overlapped, indicating excellent activity and stability of the catalyst. Moreover, a high CO 2 capture capacity of 0.44 g CO 2 =g cat was maintained after 50 carbonation-calcination cycles, being almost equal to its initial capacity (0.45 g CO 2 =g cat ).Carbonation: 923 K, 30 min, 15% CO 2 in N 2 ; calcination: 1073 K, 10 min, pure N 2 ; temperature ramp rate of 10 K/min.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming

Zhou

Zhao

et al. 2014

AIChE Journal

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“…On the other hand, new synthetic nanomaterials have been developed to improve hydrothermal stability of CO 2 acceptors, such as synthetic mesoporous CaO44 and CaO‐based materials doped with inert but stable oxides (e.g. CeO, ZrO 2 , Al 2 O 3 or TiO 2 ) 45, 46. The synthetic CaO‐based acceptors with large pores, small CaO crystals and surface dopants, such as CaOAl 2 O 3 and CaOCeZrO x mixed oxides, are found to have good kinetics and cyclic stability in ex situ CO 2 capture,46, 47 as well as in situ CO 2 capture during SESR of methane 46, 48…”

Section: Methodsmentioning

confidence: 99%

Sorption enhanced steam reforming (SESR): a direct route towards efficient hydrogen production from biomass‐derived compounds

Fermoso

Chen

2012

J of Chemical Tech & Biotech

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OVERVIEW: Efficient conversion of biomass to hydrogen is imperative in order to realize sustainable hydrogen production. Sorption enhanced steam reforming (SESR) is an emerging technology to produce high purity hydrogen directly from biomass‐derived oxygenates, by integrating steam reforming, water‐gas shift and CO2 separation in one‐stage. Factors such as simplicity of the hydrogen production process, flexibility in feedstock, high hydrogen yield and low cost, make the SESR process attractive for biomass conversion to fuels. IMPACT: Recent work has demonstrated that SESR of biomass‐derived oxygenates has greater potential than conventional steam reforming for hydrogen production. The flexibility of SESR processes resides in the diversity of feedstocks, which can be gases (e.g. biogas, syngas from biomass gasification), liquids (e.g. bioethanol, glycerol, sugars or liquid wastes from biomass processing) and solids (e.g. lignocellulosic biomass). SESR can be developed to realize a simple biomass conversion process but with high energy efficiency. APPLICATIONS: Hydrogen production by SESR of biomass‐derived compounds can be integrated into existing oil refineries and bio‐refineries for hydrotreating processing, making the production of gasoline and diesel greener. Moreover, hydrogen from SESR can be directly fed to fuel cells for power generation. Copyright © 2012 Society of Chemical Industry

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“…Al 2 O 3 [13][14][15], MgO [16], KMnO 4 [17], CaTiO 3 [18], Ca 12 Al 14 O 33 [19][20][21], Ca 9 Al 6 O 18 [22,23]. Despite good performance in CO 2 sorption, these sorbents are not always applicable to SE-SR due to the presence of steam which would accelerate their deactivation [24]. In [23] the sorbent Ca 9 Al 6 O 18 [22] was tested in SE-SR, obtaining good results in terms of hydrogen purity and sorption capacity.…”

Section: Introductionmentioning

confidence: 92%

SE-SR with sorbents based on calcium aluminates: Process optimization

2015

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Enhanced hydrogen production by in situ CO2 removal on CaCeZrOx nanocrystals

Cited by 43 publications

References 46 publications

Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming

Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming

Sorption enhanced steam reforming (SESR): a direct route towards efficient hydrogen production from biomass‐derived compounds

SE-SR with sorbents based on calcium aluminates: Process optimization

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Enhanced hydrogen production by in situ CO2 removal on CaCeZrOx nanocrystals

Cited by 43 publications

References 46 publications

Ni/CaO‐Al2O3 bifunctional catalysts for sorption‐enhanced steam methane reforming

Ni/CaO‐Al2O3 bifunctional catalysts for sorption‐enhanced steam methane reforming

Sorption enhanced steam reforming (SESR): a direct route towards efficient hydrogen production from biomass‐derived compounds

SE-SR with sorbents based on calcium aluminates: Process optimization

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Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming

Ni/CaO‐Al₂O₃ bifunctional catalysts for sorption‐enhanced steam methane reforming