COx free hydrogen production over cobalt incorporated silicate structured mesoporous catalysts

Varışlı, Dilek; Kaykac, Nalan Gulcin

doi:10.1016/j.apcatb.2012.08.042

Cited by 45 publications

(20 citation statements)

References 53 publications

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“…The addition of alkali metals as promoters have been reported to be effective at preventing sintering of Fe nanoparticles [55]. As an example, the addition of K 2 O on iron fused with Al 2 O 3 and CaO resulted in a six fold increase in ammonia decomposition rate (400°C, 30 % NH 3 ) compared to the same catalysts without K 2 O [49].…”

Section: Effect Of Promoters On Iron-based Systemsmentioning

confidence: 97%

“…Co-impregnation of unsupported cobalt with calcium, aluminium and potassium oxides promoters was found to enhance the catalytic activity [59,60]. Specifically, the promoter effect of potassium on Co/silicate catalysts increased as the quantities of KOH increased, which may be due to an increase in surface area and reduced pore diameter [55]. On the other hand, the presence of chromium and manganese on Co/mixed oxide catalyst resulted in lower activity with respect to the cobalt-only catalyst, yet no explanations were provided following this reporting [59].…”

Section: Effect Of Promoters On Cobalt-based Systemsmentioning

confidence: 99%

“…The current literature shows a range of techniques used to stabilise cobalt nanoparticles, including core-shell structures [45], incorporation within silica [55,57] or alumina [44] matrices and ceramic [56] or carbon [20,61,62] supports. Carbon materials are the most studied supports due to their mechanical stability and in most cases, a good metal-support interaction with cobalt, resulting in an improved electron transfer and consequently a reduction in the nitrogen desorption energy [20].…”

Section: Effect Of the Support On Cobalt-based Catalystsmentioning

confidence: 99%

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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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Section: Effect Of Promoters On Iron-based Systemsmentioning

confidence: 97%

Section: Effect Of Promoters On Cobalt-based Systemsmentioning

confidence: 99%

Section: Effect Of the Support On Cobalt-based Catalystsmentioning

confidence: 99%

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

2016

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“…A recent kinetic study by Lendzion-Bielun et al [21] showed a lower ammonia decomposition activation energy on cobalt than on iron-based catalysts. Previous studies suggest that the catalytic activity of cobalt-based catalysts can be related to i. the level of dispersion and crystallite size [22] and ii. the cobalt-support interaction [17].…”

Section: Introductionmentioning

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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“…basicity and electron conductivity) as well as by the presence of promoters. [12][13][14][15][16][17][18] Likewise, the preparation method and pre-treatment conditions, are critical parameters altering activity and stability. 19 The use of high surface area supports, especially with basic properties by the addition of alkali or alkaline earth promoters, resulted in the higher metal dispersions; the most active cobalt particle size has been reported within the range 10-20 nm.…”

Section: Introductionmentioning

confidence: 99%

Development of a Ba–CoCe catalyst for the efficient and stable decomposition of ammonia

Morlanés

Sayas

Shterk

et al. 2021

Catal. Sci. Technol.

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COx free hydrogen production over cobalt incorporated silicate structured mesoporous catalysts

Cited by 45 publications

References 53 publications

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

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

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

Development of a Ba–CoCe catalyst for the efficient and stable decomposition of ammonia

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