Hydrogen production by ammonia decomposition using Co catalyst supported on Mg mixed oxide systems

Podila, Seetharamulu; Alhamed, Yahia A.; Al-Zahrani, Abdulrahim A.; Petrov, L.

doi:10.1016/j.ijhydene.2015.09.057

“…basicity and electron conductivity) [56] as well as the presence of promoters have been explored in order to understand their role and facilitate the development of active cobalt-based catalysts. Based on the current literature, the active cobalt phase for ammonia decomposition has not been clearly identified, although some reports suggest that it is metallic cobalt [27].…”

Section: Cobalt-based Catalystsmentioning

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%

“…Podila and co-workers [56] incorporated Mg oxide supports with Al, Ce and La oxides with a Mg:M ratio of 2:1 for use as a support of cobalt catalysts. Out of the three, the addition of LaO provided the highest activity enhancement with a rate of reaction of 385 mol H 2 mol…”

Section: Effect Of Promoters On Cobalt-based Systemsmentioning

confidence: 99%

“…Due to the limited number of studies of cobalt catalysts for ammonia decomposition, it is difficult to draw concrete conclusions about the most active cobalt particle size, although in general the highest rates of conversion (at 500°C) have been reported within the size range 10-20 nm [44,56].…”

mentioning

confidence: 99%

“…Co h À1 due to calcination of the support in air [56] and nitrogen [58] respectively. However, it is worth noting that the ratio of Mg:La is 2 in the former [56] and 3 in the latter [58] which may also contribute to the improvement in activity.…”

mentioning

confidence: 99%

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

Bell

¹

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Torrente‐Murciano

²

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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Single‐Atom Barium Promoter Enormously Enhanced Non‐Noble Metal Catalyst for Ammonia Decomposition

Xu,

Zhang,

Wang

et al. 2024

Angewandte Chemie

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As a well‐established topic, single‐atom catalyst has drawn growing interest for its high utilization of metal. However, researchers prefer to develop various active metals with single‐atom form, the intrinsic roles of single‐atom promoters are usually underrated, which are significant in boosting reaction activity. In this work, Ba single atoms were in situ prepared in the Co‐Ba/Y2O3 catalyst with crystallized BaCO3 as the precursor under the ammonia decomposition reaction condition. The optimized Co‐Ba/Y2O3 catalyst achieves extremely high H2 production rate of 138.3 mmolH2·gcat−1·min−1 at very low temperature (500 °C, GHSV = 840,000 mL·g−1·h−1) and Co‐Ba/Y2O3 exhibits excellent durability during the 350 h test, which realizes the highest activity among all non‐noble catalysts, and reaches or even exceeds numerous reported Ru‐based catalysts. Both Y2O3 and Co demonstrate positive interactions with Ba, which significantly facilitates the dispersion of Ba species at high temperatures (≥ 600 °C). Ba single atoms significantly enhance the charge density of Co and form additionally active Co‐O‐Ba‐Y2O3 interfacial sites, which alleviates hydrogen poisoning and decreases the reaction barrier of the N‐H bond activation of *NH. The exploration of atomically dispersed promoters is groundbreaking in heterogeneous catalysis, which opens up a whole new domain of catalytic material.

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Single‐Atom Barium Promoter Enormously Enhanced Non‐Noble Metal Catalyst for Ammonia Decomposition

Xu,

Zhang,

Wang

et al. 2024

Angew Chem Int Ed

1

0

View full text Add to dashboard Cite

As a well‐established topic, single‐atom catalyst has drawn growing interest for its high utilization of metal. However, researchers prefer to develop various active metals with single‐atom form, the intrinsic roles of single‐atom promoters are usually underrated, which are significant in boosting reaction activity. In this work, Ba single atoms were in situ prepared in the Co‐Ba/Y2O3 catalyst with crystallized BaCO3 as the precursor under the ammonia decomposition reaction condition. The optimized Co‐Ba/Y2O3 catalyst achieves extremely high H2 production rate of 138.3 mmolH2·gcat−1·min−1 at very low temperature (500 °C, GHSV = 840,000 mL·g−1·h−1) and Co‐Ba/Y2O3 exhibits excellent durability during the 350 h test, which realizes the highest activity among all non‐noble catalysts, and reaches or even exceeds numerous reported Ru‐based catalysts. Both Y2O3 and Co demonstrate positive interactions with Ba, which significantly facilitates the dispersion of Ba species at high temperatures (≥ 600 °C). Ba single atoms significantly enhance the charge density of Co and form additionally active Co‐O‐Ba‐Y2O3 interfacial sites, which alleviates hydrogen poisoning and decreases the reaction barrier of the N‐H bond activation of *NH. The exploration of atomically dispersed promoters is groundbreaking in heterogeneous catalysis, which opens up a whole new domain of catalytic material.

show abstract

Hydrogen production by ammonia decomposition using Co catalyst supported on Mg mixed oxide systems

Cited by 70 publications

References 38 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

Single‐Atom Barium Promoter Enormously Enhanced Non‐Noble Metal Catalyst for Ammonia Decomposition

Single‐Atom Barium Promoter Enormously Enhanced Non‐Noble Metal Catalyst for Ammonia Decomposition

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