Production of hydrogen with low COx-content for PEM fuel cells by cyclic water gas shift reactor

Hydrogen can be produced from a mixture of CH 4 and CO 2 , based on chemical looping techniques. A physical mixture of a Ni/Al 2 O 3 catalyst and Fe 2 O 3 -CeZrO 2 as oxygen storage material is used in the chemical looping. During the reduction step, CH 4 /CO 2 is converted over Ni/ Al 2 O 3 into syngas, which then reduces iron oxide, giving CO 2 and H 2 O. During re-oxidation of the oxygen storage material by steam, H 2 with ppm levels of CO x is produced.

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“…But carbon oxides can be released due to reoxidation steam gasification of carbon deposits on the samples surface see Eq. (10) [29]:…”

Section: Ch 4 and Co 2 Conversion Over A Physical Mixture Of Ni/al 2 mentioning

confidence: 99%

Hydrogen Production from Methane and Carbon Dioxide by Catalyst-Assisted Chemical Looping

2011

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“…As one of the most significant earth oxides, iron oxide can be employed in the development of active and stable catalytic materials for reforming reactions to produce syngas [ 17 , 18 , 19 , 20 , 21 ], for production of chemicals [ 22 , 23 , 24 ], such as allyl alcohol [ 25 , 26 ], as an active component for catalytic oxidation in exhaust converters [ 27 , 28 ], for hydrodeoxygenation [ 29 , 30 ] and hydrogenation [ 31 , 32 ] reactions, for hydrogen sulfide removal from sewage [ 33 ], for electrochemical reduction of CO 2 [ 34 ], in batteries [ 35 ], in chemical looping processes [ 36 , 37 , 38 , 39 , 40 ], in water gas shift reaction [ 41 , 42 , 43 , 44 ], etc. The use of iron in the proton exchange membrane (PEM) fuel cells [ 43 , 45 ] has also attracted special interest. Sebastian and co-workers [ 46 ] utilized Fe–N–C based catalyst as cathode in a direct methanol fuel cell (DMFC) in order to efficiently produce power.…”

Section: Introductionmentioning

confidence: 99%

Fe-Based Nano-Materials in Catalysis

et al. 2018

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The role of iron in view of its further utilization in chemical processes is presented, based on current knowledge of its properties. The addition of iron to a catalyst provides redox functionality, enhancing its resistance to carbon deposition. FeOx species can be formed in the presence of an oxidizing agent, such as CO2, H2O or O2, during reaction, which can further react via a redox mechanism with the carbon deposits. This can be exploited in the synthesis of active and stable catalysts for several processes, such as syngas and chemicals production, catalytic oxidation in exhaust converters, etc. Iron is considered an important promoter or co-catalyst, due to its high availability and low toxicity that can enhance the overall catalytic performance. However, its operation is more subtle and diverse than first sight reveals. Hence, iron and its oxides start to become a hot topic for more scientists and their findings are most promising. The scope of this article is to provide a review on iron/iron-oxide containing catalytic systems, including experimental and theoretical evidence, highlighting their properties mainly in view of syngas production, chemical looping, methane decomposition for carbon nanotubes production and propane dehydrogenation, over the last decade. The main focus goes to Fe-containing nano-alloys and specifically to the Fe–Ni nano-alloy, which is a very versatile material.

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“…The chosen reaction has importance for steelmaking [23,24] and also the production of pure H 2 via the steam-iron process [25][26][27][28][29]. To achieve these goals a D3Q19 model with MRT collision operator for hydrodynamn Fe 2 O 3 moles of reactive iron oxide per unit volume particle p pressure, = q/3 p out pressure at outlet r radial position within particle R external particle radius S collision matrix, = diag (s 1 , .…”

Section: Introductionmentioning

confidence: 99%

Validation of a lattice Boltzmann model for gas–solid reactions with experiments

Bohn

Scott

Dennis

et al. 2012

Journal of Computational Physics

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Production of hydrogen with low COx-content for PEM fuel cells by cyclic water gas shift reactor

Cited by 34 publications

References 19 publications

Hydrogen Production from Methane and Carbon Dioxide by Catalyst-Assisted Chemical Looping

Hydrogen Production from Methane and Carbon Dioxide by Catalyst-Assisted Chemical Looping

Fe-Based Nano-Materials in Catalysis

Validation of a lattice Boltzmann model for gas–solid reactions with experiments

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