A high-density ammonia storage/delivery system based on Mg(NH3)6Cl2 for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si27.gif" display="inline" overflow="scroll"><mml:mi>SCR</mml:mi></mml:math>–<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si28.gif" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>DeNO</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>in vehicles

Elmøe, Tobias Dokkedal; Sørensen, Rasmus Zink; Quaade, Ulrich; Christensen, Claus H.; Nørskov, Jens K.; Johannessen, Tue

doi:10.1016/j.ces.2005.11.038

Cited by 87 publications

(48 citation statements)

References 11 publications

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“…[1][2][3][4][5] Alternatively, hydrogen can be stored indirectly as NH 3 and catalytically split to H 2 and N 2 ,f or example, by NaNH 2 or mixed Li 2 NH-Fe 2 N. [6][7][8] This makes ammonia storage attractive, which is possible in series of amminea lkaline earth metal chlorides, that is, Mg(NH 3 ) n Cl 2 (n = 1, 2, and 6), Ca(NH 3 ) n Cl 2 (n = 1, 2, and 8), and Sr(NH 3 ) n Cl 2 (n = 1, 2, and 8). [9][10][11] Mg(NH 3 ) 6 Cl 2 is among the most studied as ar esult of the high volumetric and gravimetric hydrogen capacity (114 kg H 2 m À3 ,9 .2 wt %H 2 )a sw ell as good absorptiona nd desorption kinetics. [12,13] However, undesirable high temperatures around 180 8Ca re still neededt or elease the first four NH 3 molecules (6.1 wt %H 2 ), and the last two NH 3 molecules are released at even higher temperatures in two steps at 260 and3 30 8C.…”

Section: Introductionmentioning

confidence: 99%

Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties

et al. 2015

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A new series of solvent- and halide-free ammine strontium metal borohydrides Sr(NH3 )n (BH4 )2 (n=1, 2, and 4) and further investigations of Ca(NH3 )n (BH4 )2 (n=1, 2, 4, and 6) are presented. Crystal structures have been determined by powder XRD and optimized by DFT calculations to evaluate the strength of the dihydrogen bonds. Sr(NH3 )(BH4 )2 (Pbcn) and Sr(NH3 )2 (BH4 )2 (Pnc2) are layered structures, whereas M(NH3 )4 (BH4 )2 (M=Ca and Sr; P21 /c) are molecular structures connected by dihydrogen bonds. Both series of compounds release NH3 gas upon thermal treatment if the partial pressure of ammonia is low. Therefore, the strength of the dihydrogen bonds, the structure of the compounds, and the NH3 /BH4 (-) ratio for M(NH3 )n (BH4 )m have little influence on the composition of the released gasses. The composition of the released gas depends mainly on the thermal stability of the ammine metal borohydride and the corresponding metal borohydride.

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Section: Introductionmentioning

confidence: 99%

Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties

et al. 2015

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“…Furthermore, they are found to exhibit facile ammonia release kinetics [6]. In addition, recently, these compounds have also been proposed as an ideal ammonia storage in connection with selective catalytic reduction (SCR) of NO x systems [7] in both diesel and lean-burn gasoline-driven automobiles.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of polycrystalline [Ni(NH3)6](NO3)2

Mikuli

Migdał-Mikuli

Majda

2012

J Therm Anal Calorim

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“…Applications of the materials include thermochemical heat pumps, 1 ammonia separation, 2 and ammonia storage and delivery 3,4 for fuel cells 5 or selective catalytic reduction of NO x gasses. 6 Salts that form complexes with ammonia are very common and show a wide spectrum in binding energies and ammonia capacities. 1 For reasons of ammonia storage capacity and availability, alkaline Earth halides are very attractive, and for practical reasons of operating temperature and pressure, CaCl 2 and SrCl 2 are often preferred.…”

Section: Introductionmentioning

confidence: 99%

Surface adsorption in strontium chloride ammines

Ammitzbøll¹,

Lysgaard

Klukowska³

et al. 2013

The Journal of Chemical Physics

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An adsorbed state and its implications on the ab-and desorption kinetics of ammonia in strontium chloride ammine is identified using a combination of ammonia absorption measurements, thermogravimetric analysis, and density functional theory calculations. During thermogravimetric analysis, ammonia desorption originating from the adsorbed state is directly observed below the bulk desorption temperature, as confirmed by density functional theory calculations. The desorption enthalpy of the adsorbed state of strontium chloride octa-ammine is determined with both techniques to be around 37-39 kJ/mol. A simple kinetic model is proposed that accounts for the absorption of ammonia through the adsorbed state. © 2013 AIP Publishing LLC. [http://dx

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A high-density ammonia storage/delivery system based on Mg(NH3)6Cl2 forSCR–DeNOxin vehicles

Cited by 87 publications

References 11 publications

Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties

Ammine Calcium and Strontium Borohydrides: Syntheses, Structures, and Properties

Thermal decomposition of polycrystalline [Ni(NH3)6](NO3)2

Surface adsorption in strontium chloride ammines

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