High purity hydrogen production via sorption enhanced chemical looping reforming: Application of 22Fe2O3/MgAl2O4 and 22Fe2O3/Al2O3 as oxygen carriers and cerium promoted CaO as CO2 sorbent

Hafizi, Ali; Rahimpour, Mohammad Reza; Hassanajili, Shadi

doi:10.1016/j.apenergy.2016.02.068

Cited by 86 publications

(34 citation statements)

References 54 publications

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“…The active metal oxide should be supported on an appropriate material that can effectively increase the surface area and availability of active metal oxides, improves the OC's structural properties, and subsequently increases its reactivity [18]. Al 2 O 3 is known as one of the best catalysts and oxygen carrier supports owing to its high stability (chemical and mechanical) and considerably higher melting temperature [18].…”

Section: Introductionmentioning

confidence: 99%

Inhibiting Fe–Al Spinel Formation on a Narrowed Mesopore-Sized MgAl2O4 Support as a Novel Catalyst for H2 Production in Chemical Looping Technology

Hafizi

Rahimpour

2018

Catalysts

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Abstract:In this paper, the structure of Al 2 O 3 is modified with magnesium to synthesize MgAl 2 O 4 as an oxygen carrier (OC) support. The surface properties and structural stability of the modified support are improved by the incorporation of magnesium in the structure of the support and additionally by narrowing the pore size distribution (about 2.3 nm). Then, iron oxide is impregnated on both an

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Section: Introductionmentioning

confidence: 99%

Inhibiting Fe–Al Spinel Formation on a Narrowed Mesopore-Sized MgAl2O4 Support as a Novel Catalyst for H2 Production in Chemical Looping Technology

Hafizi

Rahimpour

2018

Catalysts

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“…As an alternative method, chemical looping steam methane reforming (CL-SMR) process was proposed in order to overcome these drawbacks [20,21]. In this process the necessity of the gas separation is eliminated since the produced gas is not diluted with N 2 [22,23]. A typical CL-SMR scheme consists of two interconnected reactors where there is no direct mixing of fuel and air as indicated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…The OC needs to possess adequate stability over multiple reduction-oxidation (redox) cycles. It also should have high methane conversion and selectivity to syngas, negligible coke deposition, high oxygen transfer rate and considerable strength to agglomeration, attrition, fragmentation and other chemical and mechanical degeneration types [2,19,22,24]. Among the various oxygen carriers, nickel-based OCs are the most promising and attractive candidate as active phase for CL-SMR process because of their high activity and selectivity toward H2 production.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

et al. 2017

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Abstract:In this work, the modification of Ni/SBA-16 oxygen carrier (OC) with yttrium promoter is investigated. The yttrium promoted Ni-based oxygen carrier was synthesized via co-impregnation method and applied in chemical looping steam methane reforming (CL-SMR) process, which is used for the production of clean energy carrier. The reaction temperature (500-750 • C), Y loading (2.5-7.4 wt. %), steam/carbon molar ratio (1-5), Ni loading (10-30 wt. %) and life time of OCs over 16 cycles at 650 • C were studied to investigate and optimize the structure of OC and process temperature with maximizing average methane conversion and hydrogen production yield. The synthesized OCs were characterized by multiples techniques. The results of X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) of reacted OCs showed that the presence of Y particles on the surface of OCs reduces the coke formation. The smaller NiO species were found for the yttrium promoted OC and therefore the distribution of Ni particles was improved. The reduction-oxidation (redox) results revealed that 25Ni-2.5Y/SBA-16 OC has the highest catalytic activity of about 99.83% average CH 4 conversion and 85.34% H 2 production yield at reduction temperature of 650 • C with the steam to carbon molar ratio of 2.

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“…In addition, it is a suitable fuel for fuel cells, turbines and internal combustion engines [7,[11][12][13][14][15]. In recent years, production of hydrogen could be performed by various processes such as electrolysis, biomass gasification and reforming [5,[16][17][18][19][20]. However, reforming of natural gas is a common industrial technology for large scale of hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, Hafizi and his co-workers [12,18] synthesized 15Fe-5Ca/Al 2 O 3 and 22Fe 2 O 3 /MgAl 2 O 4 oxygen carriers and cerium promoted CaO sorbent. In their studies, OCs and sorbents were mixed and used in SECLR process to produce hydrogen with high purity.…”

Section: Introductionmentioning

confidence: 99%

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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High purity hydrogen production via sorption enhanced chemical looping reforming: Application of 22Fe2O3/MgAl2O4 and 22Fe2O3/Al2O3 as oxygen carriers and cerium promoted CaO as CO2 sorbent

Cited by 86 publications

References 54 publications

Inhibiting Fe–Al Spinel Formation on a Narrowed Mesopore-Sized MgAl2O4 Support as a Novel Catalyst for H2 Production in Chemical Looping Technology

Inhibiting Fe–Al Spinel Formation on a Narrowed Mesopore-Sized MgAl2O4 Support as a Novel Catalyst for H2 Production in Chemical Looping Technology

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

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

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