Reduction and oxidation properties of Fe2O3/ZrO2 oxygen carrier for hydrogen production

Kang, Kiyoon; Kim, Chang-Hee; Bae, Ki Kwang; Cho, Won Chul; Jeong, Seong-Uk; Lee, Yunje; Park, Chu-Sik

doi:10.1016/j.cherd.2014.04.001

Cited by 32 publications

(12 citation statements)

References 39 publications

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“…Regarding Fe-based oxygen carriers, promoter materials such as Al 2 O 3 [78,79,80,81,82], MgO [83,130], TiO 2 [84,85,86], SiO 2 [87], MgAl 2 O 4 [88,89,90,91,103], CaO [92,93], ZrO 2 [94,95,96] and CeO 2 [22,97,98,99,100] have received extensive scientific attention in the past decades. However, these promoters can easily lead to solid-solid transformation with iron oxides during a continuous cycling process [127].…”

Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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Combining chemical looping with a traditional fuel conversion process yields a promising technology for low-CO2-emission energy production. Bridged by the cyclic transformation of a looping material (CO2 carrier or oxygen carrier), a chemical looping process is divided into two spatially or temporally separated half-cycles. Firstly, the oxygen carrier material is reduced by fuel, producing power or chemicals. Then, the material is regenerated by an oxidizer. In chemical looping combustion, a separation-ready CO2 stream is produced, which significantly improves the CO2 capture efficiency. In chemical looping reforming, CO2 can be used as an oxidizer, resulting in a novel approach for efficient CO2 utilization through reduction to CO. Recently, the novel process of catalyst-assisted chemical looping was proposed, aiming at maximized CO2 utilization via the achievement of deep reduction of the oxygen carrier in the first half-cycle. It makes use of a bifunctional looping material that combines both catalytic function for efficient fuel conversion and oxygen storage function for redox cycling. For all of these chemical looping technologies, the choice of looping materials is crucial for their industrial application. Therefore, current research is focused on the development of a suitable looping material, which is required to have high redox activity and stability, and good economic and environmental performance. In this review, a series of commonly used metal oxide-based materials are firstly compared as looping material from an industrial-application perspective. The recent advances in the enhancement of the activity and stability of looping materials are discussed. The focus then proceeds to new findings in the development of the bifunctional looping materials employed in the emerging catalyst-assisted chemical looping technology. Among these, the design of core-shell structured Ni-Fe bifunctional nanomaterials shows great potential for catalyst-assisted chemical looping.

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Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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“…Thermodynamic considerations indicate that three oxygen carriers can be used to produce H2 and capture CO2 within the same process [21,[33][34][35]. These three metal oxides (i.e.…”

Section: Thermodynamic Analysesmentioning

confidence: 99%

Development and techno-economic analyses of a novel hydrogen production process via chemical looping

Bahzad

Shah

Dowell

et al. 2019

International Journal of Hydrogen Energy

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In this work, a novel hydrogen production process (Integrated Chemical Looping Water Splitting "ICLWS") has been developed. The modelled process has been optimized via heat integration between the main process units. The effects of the key process variables (i.e. the oxygen carrier-to-fuel ratio, steam flow rate and discharged gas temperature) on the behaviour of the reducer and oxidiser reactors were investigated. The thermal and exergy efficiencies of the process were studied and compared against a conventional steammethane reforming (SMR) process. The process economic feasibility was finally evaluated by evaluating the corresponding CAPEX, OPEX and the first-year plant cost per kg of the hydrogen produced. The results show that the thermal efficiency of the ICLWS process is improved by 31.1% compared to the baseline (Chemical Looping Water Splitting without heat integration) process. Also, the hydrogen efficiency and the effective efficiencies were higher by 11.7% and 11.9%, respectively compared to the SMR process. The sensitivity analysis showed that the oxygen carrier-to-methane and -steam ratio can impact the discharged gas and solid conversions from both the reducer and oxidiser. Also, unlike for the oxidiser, the temperature of the discharged gas and solids from the reducer had an impact on the gas and solid conversion. The economic evaluation of the process showed hydrogen production costs of $1.41 and $1.62 per kilogram of hydrogen produced for ZrO2 and MgAl2O4 as support materials, respectively. This value was 14% and 1.2% lower for the SMR process with MgAl2O4 and ZrO2 as support material, respectively.

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“…Larger pores were found in the reduced pure sample, whereas the supported oxygen carrier possessed grain clusters with reduced porosity, which are expected to hamper the gas diffusion. Kang et al 138 performed an extensive isothermal kinetic investigation on iron oxide supported with 80 wt% ZrO 2 at temperatures of 740-900 C. The reduction with methane was separated into two steps Fe 2 O 3 / FeO and FeO / Fe, while the reduction with H 2 and CO was considered a one-stage reaction. According to the Hancock and Sharp method the phase-boundary controlled mechanism was suitable for describing all reduction and oxidation reactions except the second step of the methane reduction, which showed a linear behaviour.…”

Section: Kinetic Studiesmentioning

confidence: 99%