Transmission Infrared Spectroscopy of Ammonia Borane

Jash, Panchatapa; Meux, K.; Trenary, Michael

doi:10.5210/jur.v5i1.7509

Cited by 5 publications

(4 citation statements)

References 11 publications

(13 reference statements)

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“…As explained in the Experimental Section, h-BN layers on clean Ni(111) were obtained by dehydrogenation of the borane-ammonia complex. Recently, it has been demonstrated that this molecule can be fully dehydrogenated to h-BN at high temperature . Our data are comparable to the literature, , where the borazine precursor was used.…”

Section: Resultssupporting

confidence: 89%

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

et al. 2015

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Tungsten disulfide (WS2) monolayers have been synthesized under ultra high vacuum (UHV) conditions on quasi-free-standing hexagonal boron nitride (h-BN) and gold deposited on Ni(111). We find that the synthesis temperature control can be used to tune the WS2 structure. As documented by in situ core level and valence band photoemission and by ex situ Raman spectroscopy, the partially disordered WS2 layer obtained at room temperature transforms to the 2H-WS2 phase at about 400°C. Low energy electron diffraction confirms the existence of van der Waals epitaxy between WS2 and h-BN and gold substrates. The measured band structure indicates that the WS2 electronic structure is not affected by the interaction with the h-BN and gold substrates

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Section: Resultssupporting

confidence: 89%

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

et al. 2015

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“…The band at 3142 cm −1 was assigned to the stretching vibration of the hydroxyl (O-H) group of water molecules and amines (N-H) present in the pores of the zeolites [22]; bands at 1639 cm −1 were attributed to the O-H bending vibration of water molecules [23]. The band at 1400 cm −1 in untreated zeolite may be affected by characteristics peak of NH 4 + and a similar band has been observed for treated zeolites after the ion exchange process [24]. Bands at 1227 and within the range of 1070 to 1150 cm −1 were referred to the external asymmetric stretch and the internal asymmetric stretch of T-O-T, respectively.…”

Section: Zeolite Catalyst Characterizationsmentioning

confidence: 89%

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

et al. 2019

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This work highlights how the treatment of ZSM-5 (parent Zeolite Socony Mobil–5, Si/Al = 23) with different surfactant templates and alkaline solution, improved the catalytic performance in the Friedel-Crafts acylation of anisole with a propionic anhydride to obtain p-methoxypropiophenone. The modified microporous to mesoporous zeolite catalysts were characterized using different analytical techniques, including X-ray diffraction (XRD), nitrogen porosimetry, Fourier-transform infrared spectroscopy (FT-IR), temperature-programmed desorption (ammonia-TPD) and field emission scanning electron microscopy (FE-SEM) to analyze the crystallographic structure, surface acidity, surface area, porosity, morphology, and particle size. The results showed that the formed mesoporous zeolite by NaOH solution had smaller mesopores (ca. 3.7 nm) as compared to the mesoporous zeolites obtained by surfactant templates, such as, CTAB (ca. 14.9 nm), TPAOH (ca. 11.1 nm) and mixture of CTAB/TPAOH (ca. 15.2 nm). The catalytic acylation reaction was conducted in a batch glass reactor at various temperatures and the products were analyzed using off-line gas chromatography–mass spectrometry (GC-MS). It was found that the activity of treated ZSM-5 with mixed surfactant templates (CTAB/TPAOH) exhibited enhanced selectivity towards the main product (p-methoxypropiophenone) by a factor 1.7 or higher than unmodified ZSM-5 due to its increased surface area by 1.5 times and enhanced acid sites.

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“…Strictly speaking, before accepting an IR spectrum, measured by transmission of IR light through KBr pellet, its validity should be ascertained by other independent methods. Among all publications which deal with IR spectroscopy of AB, some discussion on matrix-initiated spectral variations is found only in those by Taylor and Jash. , Another commonly used technique of recording IR spectra is attenuated total reflection (ATR). However, one must be aware that the spectra obtained by the two techniques are not necessary equal, since the optical setup of ATR gives an information on near-surface level of the sample under consideration, depending on the nature of the sample. , …”

Section: Introductionmentioning

confidence: 99%

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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Transmission Infrared Spectroscopy of Ammonia Borane

Cited by 5 publications

References 11 publications

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

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

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Transmission Infrared Spectroscopy of Ammonia Borane

Cited by 5 publications

References 11 publications

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

New Strategy for the Growth of Complex Heterostructures Based on Different 2D Materials

Synthesis of Uniform Mesoporous Zeolite ZSM-5 Catalyst for Friedel-Crafts Acylation

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

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