Calorimetric process monitoring of thermal decomposition of B–N–H compounds

Wolf, G.; Baumann, J.; Baitalow, Felix; Hoffmann, Frank

doi:10.1016/s0040-6031(99)00365-2

Cited by 454 publications

(394 citation statements)

References 8 publications

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“…EGA-MS indicates that the system enters the 1 st decomposition step with a significant amount of cyclic species, that react mutually and with remaining DADB, in accordance with evidences from ab initio calculations 4 and experiments. 6,7,11,40 A similar behaviour is observed in the case of ν(BN) mode at 782 cm −1 , accompanied by ν( 10 BN) at 797 cm −1 . The band completely disappears during the induction phase, as evident from Fig.…”

Section: Induction Phasesupporting

confidence: 76%

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High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†

et al. 2016

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The present work presents a thorough experimental investigation of mechanistic pathways of thermal decomposition of ammonia borane (AB) and its mixture with KBr. A comparative detection and temperature-dependent in-situ monitoring of the decomposition products was done by use of temperature dependent infrared (IR) spectroscopy of both solid (in transmission through KBr pellets and ATR mode) and gaseous products, thermogravimetry (TG) and evolved gas analysis mass spectroscopy (EGA-MS).This enables discrimination of the processes occuring in the bulk from those in the near-surface level. For the first time, a high influence of the KBr matrix on AB decomposition was found and thoroughly investigated. Although KBr does not change the chemical and physical identity of AB at ambient conditions, it dramatically affects its thermal decomposition pathway. It is found that the presence of KBr not only favours the production of diammoniate of diborane in the induction phase, but also enables an efficient catalysis of AB decomposition by NH + 4 ions, present at the KBr − AB interface, which leads to suppression of emission of unwanted gaseous side products other than NH 3 . IR spectroscopy was also used to shed a light on the molecular background of the frequently observed, but never investigated increase of the mass of decomposition products.

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Section: Induction Phasesupporting

confidence: 76%

“…6,40,48 This implies that under the present experimental conditions the formation of PAB ends in this temperature region. However, a large difference in intensity of the 1450 cm −1 band (i.e.…”

Section: Nd Decomposition Stepsupporting

confidence: 51%

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†

et al. 2016

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“…It has been shown that hydrogen can be released from AB via catalytic hydrolysis [1][2][3][4][5][6][7][8][9][10] or thermal decomposition. [11][12][13][14] The rate of hydrolysis of AB (Eq. 1) is appreciable in the presence of a suitable catalyst NH 3 BH 3 + 2 H 2 O = BO 2 -+ NH 4 + + 3H 2 1…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Nagle

Rohan

2011

J. Electrochem. Soc.

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Nanoporous gold (NPG) electrodes were fabricated in film and wire array formats by selectively dealloying Ag from Au0.18Ag0.82. The ammonia borane (AB) oxidation reaction was studied by cyclic voltammetry at the NPG electrodes. The onset potential for the oxidation at NPG in a wire array format shifted to more negative potentials than that observed at a Au disc and higher currents were realised. An onset potential of −1.30 V vs. SCE was recorded which is 0.28 V lower than that at a Au disc. The oxidation current for 20 mM AB in 1 M NaOH increased from 2.65 mA cm−2 at a Au disc to 13.1 mA cm−2 at a NPG wire array. NPG is a viable candidate as an anode catalyst for a direct ammonia borane fuel cell.

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“…Among them, NH 3 BH 3 [1,2] and NaBH 4 [3,4] have attracted the most attention. Through pyrolysis, NH 3 BH 3 gives off 12 wt % hydrogen at 150 °C, but it suffers from low rates of H 2 release and the formation of the volatile impurity-borazine [5,6].…”

Section: Introductionmentioning

confidence: 99%

High-capacity hydrogen release through hydrolysis of NaB3H8

Huang

Chen

Yisgedu

et al. 2011

International Journal of Hydrogen Energy

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NaB3H8 has advantages over NaBH4 and NH3BH3, two most widely studied chemical hydrides for hydrogen storage via hydrolysis. NaB3H8 has an extraordinary high solubility in water and thus possesses a high theoretical capacity of 10.5 wt% H via hydrolysis, in contrast to 7.5 wt% for NaBH4 and 5.1 wt% for NH3BH3. NaB3H8 is reasonably stable in water which makes it unnecessary to add corrosive NaOH as a stabilizer as the case for NaBH4. Furthermore, hydrolysis of NaB3H8 can be catalyzed by a Co-based catalyst with fast kinetics that is comparable to Ru-based catalysts. Therefore, cost-effective hydrolysis of NaB3H8 is possible for practical applications. A high capacity of 7.4 wt% H was achieved when water was included in the materials weight. AbstractNaB 3 H 8 has advantages over NaBH 4 and NH 3 BH 3 , two most widely studied chemical hydrides for hydrogen storage via hydrolysis. NaB 3 H 8 has an extraordinary high solubility in water and thus possesses a high theoretical capacity of 10.5 wt % H via hydrolysis, in contrast to 7.5 wt % for NaBH 4 and 5.1 wt % for NH 3 BH 3 . NaB 3 H 8 is reasonably stable in water which makes it unnecessary to add corrosive NaOH as a stabilizer as the case for NaBH 4 . Furthermore, hydrolysis of NaB 3 H 8 can be catalyzed by a Co-based catalyst with fast kinetics that is comparable to Ru-based catalysts.Therefore, cost-effective hydrolysis of NaB 3 H 8 is possible for practical applications. A high capacity of 7.4 wt % H was achieved when water was included in the materials weight.

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Calorimetric process monitoring of thermal decomposition of B–N–H compounds

Cited by 454 publications

References 8 publications

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

High-capacity hydrogen release through hydrolysis of NaB3H8

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Calorimetric process monitoring of thermal decomposition of B–N–H compounds

Cited by 454 publications

References 8 publications

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane†

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane†

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

High-capacity hydrogen release through hydrolysis of NaB3H8

Contact Info

Product

Resources

About

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†

High Influence of Potassium Bromide on Thermal Decomposition of Ammonia Borane^†