Hydrogen production from ammonia decomposition using Co/γ-Al2O3 catalysts – Insights into the effect of synthetic method

Bell, TE; Ménard, Hervé; Carballo, Juan María González; Tooze, RP; Torrente‐Murciano, Laura

doi:10.1016/j.ijhydene.2020.07.090

Cited by 51 publications

(19 citation statements)

References 42 publications

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“…Because of (1) the different thermal conductivity coefficients between these molecules and the He carrier and (2) a rapid increase in the number of generated molecules at the high-temperature zone (500–600 °C), a sharp peak was thereby generated in the TCD-applied NH 3 -TPD profile but not in the mass-applied profile (Figure S2b). Co is a good and common catalyst for NH 3 decomposition, which was also confirmed by additional NH 3 -pulse experiments over the 2 wt % Co 3 O 4 /SAPO-34-SPG catalyst (Figure S3). Metallic Co is obviously more active than Co oxide, while the latter could be reduced by NH 3 with the production of NO, N 2 O, N 2 , and H 2 O (Figure S3a).…”

Section: Resultssupporting

confidence: 60%

Suppressing C–C Bond Dissociation for Efficient Ethane Dehydrogenation over the Isolated Co(II) Sites in SAPO-34

Zhang

et al. 2021

ACS Catal.

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Various Co-based SAPO-34 catalysts were prepared using different methods, including ion exchange (IE), incipientwetness impregnation (IWI), and solid-phase grinding (SPG), to correlate the chemical states of Co species with the C−H and C−C bond scissions in ethane dehydrogenation. The IE-prepared Co/ SAPO-34 led to stable, unreducible, and isolated exchanged Co sites anchored on the zeolite framework with a structure of −Al F − O−Co−O− and showed the highest selectivity to ethylene of close to 98% at 600 °C, which suggests that these Co sites favors suppressing the C−C bond scission in ethane. In comparison, the IWI-and SPG-prepared Co/SAPO-34 catalysts, especially for those with a high Co loading, inevitably give Co oxide clusters that are easily reduced into metallic Co. Together with catalytic results, characterizations, and DFT calculations, it is confirmed that the reduced Co clusters, especially for those outside SAPO-34 channels without the confinement effect, favor both C−H and C−C bond scission, boosting the conversion of ethane into CH 4 or/and coke; however, the ionic-state −Co−O− species can smoothly terminate the ethane dehydrogenation for the ethylene product due to relatively high energy barriers for both C−H and C−C bond scission, avoiding a deep dehydrogenation and C−C cracking. As expected, the unreducible −Co−O− sites are very stable in the title reaction without deanchoring from the zeolite framework in a 100 h cyclic test. This study not only demonstrates the stable −M δ+ −O δ− structure favorable for suppressing C−C bond scission but also highlights a catalyst-constructing strategy for Co-based and similar metal-based catalysts for dehydrogenation of other light alkanes.

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Section: Resultssupporting

confidence: 60%

Suppressing C–C Bond Dissociation for Efficient Ethane Dehydrogenation over the Isolated Co(II) Sites in SAPO-34

Zhang

et al. 2021

ACS Catal.

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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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“…, Ce, La, Na, and K) have been broadly studied for improving ADR activity. 21,26,27 Among the myriad of existing catalysts, the bimetallic ( e.g. , NiFe and CoMo) alloys with selected support and promoters have been identified as promising candidates for the ADR as compared to the monometallic active phases.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generation via ammonia decomposition on highly efficient and stable Ru-free catalysts: approaching complete conversion at 450 °C

Tabassum

Mukherjee

Chen

et al. 2022

Energy Environ. Sci.

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Hydrogen production from ammonia decomposition using Co/γ-Al2O3 catalysts – Insights into the effect of synthetic method

Abstract: Hydrogen production from ammonia decomposition using Co/-Al 2 O 3 catalysts -Insights into the effect of synthetic method.

Cited by 51 publications

References 42 publications

Suppressing C–C Bond Dissociation for Efficient Ethane Dehydrogenation over the Isolated Co(II) Sites in SAPO-34

Suppressing C–C Bond Dissociation for Efficient Ethane Dehydrogenation over the Isolated Co(II) Sites in SAPO-34

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

Hydrogen generation via ammonia decomposition on highly efficient and stable Ru-free catalysts: approaching complete conversion at 450 °C

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