7775-19-1Relevant articles and documents
Sound Velocities, Elasticity, and Mechanical Properties of Stoichiometric Submicron Polycrystalline δ-MoN at High Pressure
Zou, Yongtao,Liu, Ke,Wang, Pei,Wang, Daowei,Li, Mu,Li, Ying,Fang, Leiming,Zhuo, Hongbin,Ruan, Shuangchen,Zhou, Cangtao,Zhao, Yusheng
, p. 11897 - 11906 (2021)
Acoustic velocities and elasticity of stoichiometric submicron polycrystalline δ-MoN have been reported at high pressure using ultrasonic measurements and first-principles calculations. Using the finite-strain equation-of-state approach, the bulk modulus
Study of vaporization of sodium metaborate by transpiration thermogravimetry and knudsen effusion mass spectrometry
Lakshmi Narasimhan,Viswanathan,Nalini
, p. 13261 - 13270 (2011)
The vaporization of solid sodium metaborate NaBO2(s) was studied by transpiration thermogravimetry (TTG) and Knudsen effusion mass spectrometry (KEMS). The transpiration measurements, performed for the first time on NaBO2(s), involved use of argon as the carrier gas for vapor transport and derivation of vapor pressure of NaBO2(g) (by assuming it as the sole vapor species) through many flow-dependence runs and temperature-dependence runs in the temperature range 1075-1218 K. The KEMS measurements performed in the temperature range 1060-1185 K confirmed NaBO 2(g) as the principal vapor species over NaBO2(s), in accord with the previously reported KEMS studies. The values of p(NaBO 2) obtained by both TTG and KEMS are consistent within the uncertainties associated with each method and so are the second-and third-law values of enthalpy of sublimation, the latter aspect consistently missing in all previous vaporization studies. The results of both TTG and KEMS were combined to recommend the following thermodynamic parameters pertinent to the sublimation reaction, NaBO2(s) = NaBO2(g): Log{p(NaBO 2)/Pa} = -(17056 ?± 441)/(T/K) + (14.73 ?± 0.35) for the temperature range 1060-1218 K; ??rHo m(298.15 K) = (346.3 ?± 9.4) kJa?￠mol-1; and ??rSom(298.15 K) = (210.2 ?± 6.8) Ja?￠mol-1a?￠K-1. ? 2011 American Chemical Society.
Hierarchical porous ZIF-8 for hydrogen production: Via the hydrolysis of sodium borohydride
Abdelhamid, Hani Nasser
, p. 4416 - 4424 (2020/04/20)
Hydrides show good performance for hydrogen gas storage/release. However, hydrogen gas release from hydrides via hydrolysis is a slow process and thus requires a catalyst. Herein, terephthalic acid (TPA) is used for the synthesis of a hierarchical porous zeolitic imidazolate framework (HPZIF-8). A mechanistic study of materials synthesis involved an in situ synthesis of zinc hydroxide nitrate nanosheets with an interplanar distance of 0.97 nm. Terephthalic acid modulates the pH value of the synthesis solution leading to the formation of HPZIF-8 with the Brunauer-Emmett-Teller (BET) surface area, Langmuir surface area, and total pore size of 1442 m2 g-1, 1900 m2 g-1, and 0.69 cm3 g-1, respectively. The formed phases during the synthesis undergo fast conversion to HPZIFs at room temperature. The application of the prepared materials in the hydrolysis of NaBH4 is reported. Acidity plays an important role in the catalytic performance of the materials. ZIF-8 prepared using terephthalic acid shows high catalytic activity with a hydrogen rate of 2333 mLH2 min-1 gcat-1 (8046 mLH2 min-1 gZn-1). The material exhibits high catalytic activity without any deterioration of its performance for several uses during continuous NaBH4 feeding. There are no changes in the material's structure after catalysis indicating the high recyclability of the materials.
UiO-66 as a catalyst for hydrogen production: Via the hydrolysis of sodium borohydride
Abdelhamid, Hani Nasser
, p. 10851 - 10857 (2020/09/02)
The exploration of a highly efficient catalyst for the hydrolysis of sodium borohydride (NaBH4) is a valuable step toward a hydrogen economy. UiO-66 (Universitetet i Oslo) was synthesized via a solvothermal method using acetic acid as a modulator. The material was characterized using X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), temperature-programmed desorption (TPD), and transmission electron microscopy (TEM). Data analysis reveals the formation of a pure and highly crystalline phase of UiO-66 with the Brunauer-Emmett-Teller (BET) and Langmuir specific surface areas of 1125 m2 g-1, and 1250 m2 g-1, respectively. UiO-66 was analysed as a catalyst for hydrogen generation via the hydrolysis of NaBH4. The effect of the NaBH4 amount and catalyst loading was investigated. The reaction time decreased with an increase of the amount of NaBH4 or UiO-66. UiO-66 exhibited an average hydrogen generation rate of 6200 mL min-1 g-1. The high catalytic performance of UiO-66 could be due to its large surface area and acidic sites. The results suggested that UiO-66 showed high potential to catalyze the hydrogen production via the hydrolysis of hydrides. This journal is
