Surface adsorption in strontium chloride ammines

Ammitzbøll, Andreas L.; Lysgaard, Steen; Klukowska, Agata; Vegge, Tejs; Quaade, Ulrich

doi:10.1063/1.4800754

Cited by 16 publications

(23 citation statements)

References 25 publications

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“…By this effect, the activation barrier to expand the material volume decreases after Mg(NH 3 ) 6 Cl 2 desorbs NH 3 . The kinetics of the ammine complex formation in other chloride also have been reported, suggesting that strontium chloride has the surface absorption state before the bulk absorption state . As mentioned above, the kinetic modification is important to control the NH 3 sorption properties of MgCl 2 .…”

Section: Introductionmentioning

confidence: 83%

“…The kinetics of the ammine complex formation in other chloride also have been reported, suggesting that strontium chloride has the surface absorption state before the bulk absorption state. 14 As mentioned above, the kinetic modification is important to control the NH 3 sorption properties of MgCl 2 . In this work, the NH 3 absorption and desorption properties of pristine and activated MgCl 2 were investigated in further detail at different temperatures to discuss the kinetic properties of the ammine complex formation of MgCl 2 .…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Activation on Ammonia Absorbing Reaction for Magnesium Chloride

Aoki¹,

Miyaoka²,

Inokawa³

et al. 2015

J. Phys. Chem. C

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Hexa-ammine complex (Mg(NH3)6Cl2) is directly formed at room temperature by the reaction between magnesium chloride (MgCl2) and ammonia (NH3) without formation of mono- and diammine complexes (Mg(NH3)Cl2 and Mg(NH3)2Cl2) even though these are more stable phases. The high kinetic barrier exists for the formation of low coordinated ammine complexes. The activation by using heat treatment and ball milling is carried out, and then the NH3 absorption properties are investigated to understand kinetic properties of the ammine complexes formation of MgCl2. At 373 K, the formation of Mg(NH3)2Cl2 is realized. Furthermore, it is found that a higher temperature than 573 K is required to form Mg(NH3)Cl2. Interestingly, the ball milled MgCl2 can transform into low coordinated ammine complexes even at room temperature, indicating that the structural disorder state generated by the ball milling induces the formation of the above phases with low activation energy. Therefore, it is expected that the kinetic barrier to form ammine complexes of MgCl2 is strongly related to the process on the structural change.

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Section: Introductionmentioning

confidence: 83%

Section: ■ Introductionmentioning

confidence: 99%

Activation on Ammonia Absorbing Reaction for Magnesium Chloride

Aoki¹,

Miyaoka²,

Inokawa³

et al. 2015

J. Phys. Chem. C

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show abstract

“…Chemisorption is one of attractive chemical processes, which can be widely used in different areas such as heat pump, energy storage, adsorption refrigeration, and combined power and cooling systems [1][2][3][4][5][6] . Inorganic salts adsorbing ammonia by solid-gas reaction has obtained ever-increasing attentions because of the high flexibility in the application of different temperature heat sources, especially low-grade thermal energy [7][8][9] . However, during adsorption and desorption process, the salts tend to swelling and caking due to the chemical reaction which hinder mass and heat transfer, leading to low system working efficiency.…”

Section: Introduction mentioning

confidence: 99%

Fabrication and thermal conductivity improvement of novel composite adsorbents adding with nanoparticles

Zhang

et al. 2016

Chin. J. Mech. Eng.

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Thermal conductivity is one of key parameters of adsorbents, which will affect the overall system performance of adsorption chiller. To improve adsorbent's thermal conductivity is always one of research focuses in chemisorption field. A new chemical composite adsorbent is fabricated by adding carbon coated metal(Aluminum and Nickel) nanoparticles with three different addition amounts into the mixture of chloride salts and natural expanded graphite aiming to improve the thermal conductivity. The preparation processes and its thermal conductivity of this novel composite adsorbent are reported and summarized. Experimental results indicate that the nanoparticles are homogenously dispersed in the composite adsorbent by applying the reported preparation processes. The thermal conductivity of the composite adsorbent can averagely enlarge by 20% when the weight ratio of the added nanoparticles is 10 wt%. Moreover, carbon coated aluminum nanoparticles exhibit more effective enlargement in thermal conductivity than nickel nanoparticles. As for the composite adsorbent of CaCl 2-NEG, there is a big reinforcement from 30% to 50% for Al@C nanoparticles, however only 10% in maximum caused by Ni@C nanoparticles. The proposed research provides a methodology to design and prepare thermal conductive chemical composite adsorbent.

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“…Complex hydrogen storage materials in the form of metal halide ammines are promising candidates for indirect hydrogen storage [167], due to high hydrogen densities [168], good cyclability and H-sorption kinetics [169,170]. Strontium chloride is one of the most studied metal halide ammines, allowing the storage of eight ammonia molecules coordinated to each metal atom giving 8.2% hydrogen by weight in Sr(NH 3 ) 8 Cl 2 [170e172].…”

Section: Effects Of Doping and Elemental Substitution In 3d Materialsmentioning

confidence: 99%