COx-free hydrogen production from ammonia – mimicking the activity of Ru catalysts with unsupported Co-Re alloys

Kirste, Karsten Granlund; McAulay, Kate; Bell, Tamsin; Stoian, Dragos; Laassiri, Said; Daisley, Angela; Hargreaves, J. S. J.; Mathisen, Karina; Torrente‐Murciano, Laura

doi:10.1016/j.apcatb.2020.119405

Cited by 26 publications

(18 citation statements)

References 39 publications

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“…This difference was also observed in the unsupported CoRe material. 25,29 The results of the EXAFS analysis (Table 3 and Fig. 5, 8) of pre-treated CoRe-gel supports the MCR-analysis confirming an 80-90% reduction.…”

Section: Speciation Of Cobalt and Rhenium In Silica Aerogels During H 2 Reductionsupporting

confidence: 63%

“…By comparison, bulk CoRe 1.6 has a lower temperature (435 1C) for 50% conversion under comparable reaction conditions. 29 Co-only and Re-only supported catalysts present similar ammonia decomposition catalytic activity. However, it is important to highlight the synergetic effect achieved by the CoRe gel in agreement with the characterisation results, although it should be cautioned that the pre-reduction temperature applied is lower than that employed in the XAS experiments.…”

Section: Catalytic Activity For Ammonia Decompositionmentioning

confidence: 89%

“…We have recently demonstrated that hydrogen pre-treatment of unsupported CoRe 1.6 resulted in formation of highly active CoRe-surface pairs for the ammonia decomposition reaction. 29 Depositing CoRe on a high surface area support such as silica aerogel is desirable as it ensures high dispersion, potentially increasing the concentration of accessible active sites. In situ XAS during hydrogen pre-treatment shows that the rhenium(VII) species starts to reduce at B240 1C while the reduction of the cobalt(II) species commences at 220 1C.…”

Section: Formation Of Core Bimetallic Nanoclusters In Silica Aerogelsmentioning

confidence: 99%

“…23 In the context of bimetallic systems, notwithstanding the fact that rhenium is a scarce metal, it is interesting to note that cobalt together with rhenium has been reported to exhibit a synergistic effect with lower reduction temperatures for both metals being achieved. [24][25][26][27][28] We have observed that unsupported Co-Re possesses ammonia decomposition activities comparable to Ru/CNT 29 which, given that it possesses a very low surface area, suggests that successfully supporting the active phase might lead to further improvement in catalyst performance. Nanoparticles confined in micropores generally experience growth restriction due to pore confinement and enhanced bimetallic interaction.…”

Section: Introductionmentioning

confidence: 96%

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XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition

Kirste

Laassiri

et al. 2020

Phys. Chem. Chem. Phys.

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Section: Speciation Of Cobalt and Rhenium In Silica Aerogels During H 2 Reductionsupporting

confidence: 63%

Section: Catalytic Activity For Ammonia Decompositionmentioning

confidence: 89%

Section: Formation Of Core Bimetallic Nanoclusters In Silica Aerogelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition

Kirste

Laassiri

et al. 2020

Phys. Chem. Chem. Phys.

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“…In recent years, many materials have been utilized as catalysts for ammonia decomposition, such as metal catalysts (including metal 97,98 and alloys 99,100 ) and alkali metal amides. 101 For example, The graphene and defective graphene-supported standing triangular Pt 3 exhibited high reactivity and low activation barriers, which was attributed to the existence of Lewis acid/base pair sites accommodate the adsorption and subsequent dissociation of NH x * (Figure 7B).…”

Section: Ammonia-based Electrocatalytic Hydrogen Storagementioning

confidence: 99%

Rational design on photo(electro)catalysts for artificial nitrogen looping

Liu

Wang

et al. 2021

EcoMat

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Nitrogen, one of most important elements on the Earth, plays an essential role in shaping the modern society. The natural nitrogen looping, however, is insufficient to satisfy the high demand of the large-scale human activities. To achieve a more sustainable and efficient utilization of nitrogen, artificial nitrogen looping by photo(electro)catalytic processes has been considered as a feasible strategy. In this context, the rational design on the high-performance catalysts for nitrogen looping becomes increasingly important and urgent. On this basis, herein, we provide a timely review on the recent progress, achievements, and essential challenges for the artificial nitrogen looping process, mainly including photo(electro)catalytic transformations among dinitrogen, ammonia, gaseous nitrogen oxides, nitrate, and so on. Especially, the photo(electro)catalysts used in various reactions involved in nitrogen looping, including nitrogen reduction reaction, nitrogen oxidation reaction, ammonia oxidation reaction, ammonia decomposition reaction, etc., are systematically introduced. Finally, we hope that this review will help us deepen the understanding of nitrogen looping-related photo(electro)catalysts, and further pave a way toward the sustainable development on energy and environment. K E Y W O R D Senvironmental protection, nitrogen looping, photo(electro)catalysis, sustainable energy Mengying Li and Xiaoqing Liu contributed equally to this study.

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Thermocatalytic Ammonia Decomposition – Status and Current Research Demands for a Carbon‐Free Hydrogen Fuel Technology

2022

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Hydrogen storage materials and technologies are deemed as the cornerstone towards a world economy less reliant on, and ultimately independent of fossil resources. Ammonia is considered among the most efficient carbon‐free hydrogen carriers because of its relatively high gravimetric and volumetric hydrogen storage capacities and, equally important, ease of transport and storage. In addition, the well‐established chemical production of ammonia (preferably a green Haber‐Bosch process) would accelerate the immediate introduction of hydrogen into energy infrastructure. Thermocatalytic decomposition of ammonia yields clean, COx‐free hydrogen, but is energy intensive and currently performed with expensive Ru‐based catalysts. The development of more efficient catalysts based on more abundant and cheaper elements is indispensable for future wide‐scale industrial application. Therefore, the conceptualization of strategies and challenges for material developments, study and optimization of ammonia decomposition catalysts as well as their in situ/operando characterizations are pivotal aspects to be considered.

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COx-free hydrogen production from ammonia – mimicking the activity of Ru catalysts with unsupported Co-Re alloys

Cited by 26 publications

References 39 publications

XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition

XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition

Rational design on photo(electro)catalysts for artificial nitrogen looping

Thermocatalytic Ammonia Decomposition – Status and Current Research Demands for a Carbon‐Free Hydrogen Fuel Technology

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