Activity study of NiO-based oxygen carriers in chemical looping steam methane reforming

Antzara, Andy; Heracleous, Eleni; Silvester, Lishil; Bukur, Dragomir B.; Lemonidou, Angeliki A.

doi:10.1016/j.cattod.2015.10.027

Cited by 70 publications

(30 citation statements)

References 55 publications

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“…A slight agglomeration phenomenon occurs on the reduced NiO surface in Fig. 5b corresponding to the reported result [10], whereas no obvious difference can be found between the fresh and reduced OCs of NiFe 2 O 4 and Fe 2 O 3 ( Fig. 5 c ~ f).…”

Section: Sem Analysissupporting

confidence: 75%

Experimental Study on Reaction Characteristic of Lignite CLC with NiFe2O4 as Oxygen Carrier

Liu¹,

Wu²

2016

Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)

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Abstract. In this work, NiFe 2 O 4 was prepared as oxygen carrier (OC) and its redox performance with lignite was systematically studied by thermogravimetric analyzer (TGA) experiments. Surface structures of the fresh and reduced NiFe 2 O 4 were characterized by SEM, BET, and XRD methods. In comparison with NiO and Fe 2 O 3 , the presence of Ni in the NiFe 2 O 4 complex increases the specific surface and pore volume, enhancing its reactivity and oxygen transfer capacity during lignite CLC. Further, multi-cycles experiments confirmed the stability of high reactivity of NiFe 2 O 4 .

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Section: Sem Analysissupporting

confidence: 75%

Experimental Study on Reaction Characteristic of Lignite CLC with NiFe2O4 as Oxygen Carrier

Liu¹,

Wu²

2016

Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)

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“…Regarding to Ni-based oxygen carriers, series of heat-resistant oxides such as Al 2 O 3 [64,65,66], SiO 2 [58,59], TiO 2 [67,68], ZrO 2 and stabilized ZrO 2 [69,70,71], as well as spinels like NiAl 2 O 4 [72,73], MgAl 2 O 4 and CaAl 2 O 4 [74,75,76] are usually considered as adequate promoter materials. Among these, NiO/Al 2 O 3 as an oxygen carrier demonstrates excellent reactivity, high thermal stability and strong resistance to carbon formation during chemical looping operation.…”

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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“…Antzara et al [6] reported the performance of different oxygen carriers including NiO/ZrO2, NiO/TiO2, NiO/SiO2 and NiO/Al2O3 in CLR process at 650 °C. The results exhibited high activity with the high composition of hydrogen about 75-80%, while the composition of carbon dioxide in the dry gaseous product was in the order of 10-12%.…”

Section: Co2 Concentration In the Reaction Mediamentioning

confidence: 99%

“…This matter has increased worldwide environmental concern [1][2][3][4]. Further improvements in the efficiency of energy production processes and the use of environmental friendly energy carriers are effective methods to overcome these problems [5,6]. Hydrogen is introduced as a good candidate to achieve this goal.…”

Section: Introductionmentioning

confidence: 99%

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Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

et al. 2017

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Abstract:In this study, the application of a calcium-based bifunctional catalyst/sorbent is investigated in modified chemical looping steam methane reforming (CLSMR) process for in situ CO 2 sorption and H 2 production. The yttrium promoted Ca-Co samples were synthesized and applied as bifunctional catalysts/sorbent. The influence of reduction temperature (500-750 • C), Ca/Co and Ca/Y ratios (1.5-∞ and 3-18, respectively) and catalyst life time are determined in CLSMR process. The physicochemical transformation of fresh, used and regenerated samples after 16 redox cycles are determined using X-ray powder diffraction (XRD), N 2 adsorption-desorption, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) techniques. The effect of yttrium promoter on the structure of catalyst and regeneration step on the reversibility of bifunctional catalyst/sorbent was two important factors. The characterization results revealed that the presence of yttrium in the structure of Ca-9Co sample could improve the morphology and textural properties of catalyst/sorbents. The suitable reversibility of bifunctional catalyst/sorbents during the repeated cycles is confirmed by characterization of calcined samples. The Ca-9Co-4.5Y as optimal catalyst illustrated superior performance and stability. It showed about 95.8% methane conversion and 82.9% hydrogen yield at 700 • C and stable activity during 16 redox cycles.

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Activity study of NiO-based oxygen carriers in chemical looping steam methane reforming

Cited by 70 publications

References 55 publications

Experimental Study on Reaction Characteristic of Lignite CLC with NiFe2O4 as Oxygen Carrier

Experimental Study on Reaction Characteristic of Lignite CLC with NiFe2O4 as Oxygen Carrier

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

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