Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Simonsen, Søren Bredmose; Chakraborty, Debashis; Chorkendorff, Ib; Dahl, Søren

doi:10.1016/j.apcata.2012.08.045

Cited by 87 publications

(49 citation statements)

References 30 publications

(44 reference statements)

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“…Acetone was used as metal solvent in preference of water as the lower surface tension of acetone allows for greater pore filling of the support [24]. The different supports were dried in a vacuum oven at 80 • C overnight prior determination of their respective wetness volume by adding acetone dropwise until wetness saturation is reached.…”

Section: Methodsmentioning

confidence: 99%

Ammonia decomposition over cobalt/carbon catalysts—Effect of carbon support and electron donating promoter on activity

2017

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Please cite this article in press as: L. Torrente-Murciano, et al., Ammonia decomposition over cobalt/carbon catalysts-Effect of carbon support and electron donating promoter on activity, Catal. Today (2016), http://dx. a b s t r a c tThis paper sets the new design parameters for the development of low temperature ammonia decomposition catalysts based on readily available cobalt as an alternative to scarce but highly active ruthenium-based catalysts. By using a variety of carbon materials as catalytic supports, we systematically demonstrate that microporous supports capable of stabilising small cobalt crystallites (∼2 nm) lead to high catalytic activities compared to bigger nanoparticles. Additionally, the degree of graphitisation of the carbon support has a detrimental effect on the activity of the cobalt (0) active sites, likely due to their potential as an electron donator. Consequently, the addition of electron donating promoters such as cesium substantially decreases the activity of the cobalt catalysts. This relationship deviates from the trends observed for ruthenium-based catalysts with an optimum 3-5 nm size where an increase of the graphitisation degree of the support and the addition of electron donating promoters increases the ammonia decomposition activity.

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Section: Methodsmentioning

confidence: 99%

Ammonia decomposition over cobalt/carbon catalysts—Effect of carbon support and electron donating promoter on activity

2017

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“…[90]. In the synthesis of NiFe/Al 2 O 3 , interestingly, both incipient wetness impregnation and co-precipitation methods resulted in alloy formation with comparable activities [91]. In addition, the support was shown to influence the activity and stability of the resulting NiFe bimetallic nanoparticles.…”

Section: Bimetallic Systemsmentioning

confidence: 99%

H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review

2016

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The wide-spread implementation of the so-called hydrogen economy is currently partially limited by an economically feasible way of storing hydrogen. In this context, ammonia has been commonly presented as a viable option for chemical storage due its high hydrogen content (17.6 wt%). However, its use as an energy carrier requires the development of catalytic systems capable of releasing hydrogen at adequate rates and conditions. At the moment, the most active catalytic systems for the decomposition of ammonia are based on ruthenium, however its cost and scarcity inhibit the wide scale use of these catalysts. This issue has triggered research on the development of alternative catalysts based on more sustainable systems using more readily available, non-noble metals mainly iron, cobalt and nickel as well as a series of transition metal carbides and nitrides and bimetallic systems, which are reviewed herein. There have been some promising cobaltand nickel-based catalysts reported for the decomposition of ammonia but metal dispersion needs to be increased in order to become more attractive candidates. Conversely, there seems to be less scope for improvement of iron-based catalysts and metal carbides and nitrides. The area with the most potential for improvement is with bimetallic catalysts, particularly those consisting of cobalt and molybdenum.

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“…Recently, our group reported Fe-Ni alloy nanoparticles as a cheaper and abundant alternative to Ru. Fe-Ni/Al 2 O 3 catalysts showed comparable or even higher activities than Ru/Al 2 O 3 under same hydrogen rich environments, which is what one expects towards the outlet of an ammonia cracking reactor [30]. Therefore, Fe-Ni/Al 2 O 3 has real potential to replace the state of the art Ru catalyst in industrial applications.…”

Section: Introductionmentioning

confidence: 77%

Synthesis and characterization of Fe–Ni/ɣ-Al2O3 egg-shell catalyst for H2 generation by ammonia decomposition

Silva¹,

Nielsen²,

Fiordaliso³

et al. 2015

Applied Catalysis A: General

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Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Cited by 87 publications

References 30 publications

Ammonia decomposition over cobalt/carbon catalysts—Effect of carbon support and electron donating promoter on activity

Ammonia decomposition over cobalt/carbon catalysts—Effect of carbon support and electron donating promoter on activity

H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review

Synthesis and characterization of Fe–Ni/ɣ-Al2O3 egg-shell catalyst for H2 generation by ammonia decomposition

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