Investigation of hydrogen generation in a three reactor chemical looping reforming process

Khan, Mohammed N.; Shamim, Tariq

doi:10.1016/j.apenergy.2015.08.033

Cited by 85 publications

(32 citation statements)

References 21 publications

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“…The results show that the endothermic reaction in the FR forms the products namely CO 2 , H 2 O, H 2 , CO, N 2 and traces of CH 4 while the highly exothermic reaction in the AR gives out argon, CO 2 In the FR, the temperature difference between the Fe-based and W-based plants is about 125 K, whereas, in the SR and the AR, the temperature differences are about 131 K and 156 K, respectively, as shown in Figure 3. Table 3 compares performance data and the emissions of unburnt CH 4 , CO and NO.…”

Section: Resultsmentioning

confidence: 95%

“…The model specifications and the assumptions used can be found in Khan and Shamim [2]. The process flow diagram of the plant with the components used are shown in Figure 1.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…For the steam cycle the property method STEAM-TA has been used. The base case model was validated with a good agreement in our previous work [2]. is supplied to ensure full conversion of fuel in the FR.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…In this regard, chemical looping reforming (CLR) offers a cost effective method of H 2 production with inherent CO 2 capture and no additional air separation unit. A three reactor chemical looping reforming (TRCLR) process is considered as the most promising CL technology for H 2 production [2]. In this process, an oxygen carrier (OC) is used to transfer oxygen from air to the fuel.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

Khan

Shamim

2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.Hydrogen production by using a three reactor chemical looping reforming (TRCLR) technology is an innovative and attractive process. Fossil fuels such as methane are the feedstocks used. This process is similar to a conventional steam-methane reforming but occurs in three steps utilizing an oxygen carrier. As the oxygen carrier plays an important role, its selection should be done carefully. In this study, two oxygen carrier materials of base metal iron (Fe) and tungsten (W) are analysed using a thermodynamic model of a three reactor chemical looping reforming plant in Aspen plus. The results indicate that iron oxide has moderate oxygen carrying capacity and is cheaper since it is abundantly available. In terms of hydrogen production efficiency, tungsten oxide gives 4% better efficiency than iron oxide. While in terms of electrical power efficiency, iron oxide gives 4.6% better results than tungsten oxide. Overall, a TRCLR system with iron oxide is 2.6% more efficient and is cost effective than the TRCLR system with tungsten oxide.

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Section: Resultsmentioning

confidence: 95%

“…The model specifications and the assumptions used can be found in Khan and Shamim [2]. The process flow diagram of the plant with the components used are shown in Figure 1.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

Khan

Shamim

2017

IOP Conf. Ser.: Earth Environ. Sci.

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“…H 2 has been considered as a potential alternative fuel that can provide the future energy. It is also a clean energy source owing to its by-product that is harmless water vapor when it is converted into useful energy [7][8][9][10]. Hydrogen could be used as an important feedstock in different chemical and petrochemical processes such as methanol, ammonia and hydrochloric acid production.…”

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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Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

Cheng

Wei

et al. 2017

Can J Chem Eng

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This work presented a comparative study on the Fe2O3‐based oxygen carriers modified by different potassium salts (i.e. KNO3, K3PO4, KOH, K2CO3) for chemical looping combustion of methane (CLC with methane). The effect of Al2O3 support on the reactivity of Fe2O3 was also investigated. The Fe2O3‐based oxygen carriers were prepared by a co‐precipitation method and the potassium salts were added via an incipient wetness impregnation method. The obtained oxygen carriers were characterized by XRD, XPS, H2‐TPR, and CH4‐TPR technologies. It was found that the presence of KNO3 could improve the reducibility of the Fe2O3‐based oxygen carrier in the surface, resulting in relatively high selectivity towards CO2 during the CLC with methane. The content of KNO3 also affected the reactivity of oxygen carriers, and 10 % KNO3/Fe2O3 sample showed the best activity. Moreover, it was also demonstrated that the addition of Al2O3 support into the 10 % KNO3/Fe2O3 oxygen carrier could improve its redox performance, and the stability of 10 % KNO3/Fe2O3/Al2O3 was proved to be favourable after twenty successive cycles for CLC with methane.

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Investigation of hydrogen generation in a three reactor chemical looping reforming process

Cited by 85 publications

References 21 publications

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

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

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

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Investigation of hydrogen generation in a three reactor chemical looping reforming process

Cited by 85 publications

References 21 publications

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

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

Modification of KNO3 on the reducibility and reactivity of Fe2O3‐based oxygen carriers for chemical‐looping combustion of methane

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Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane