The Catalytic Effect of Vanadium on Sorption Properties of MgH-Based Nanocomposites Obtained Using Low Milling Time.

The effects of catalysis using vanadium as an additive (2 and 5 wt.%) in a high-energy ball mill on composite desorption properties were examined. The influence of microstructure on the dehydration temperature and hydrogen desorption kinetics was monitored.

Mechanochemical Metathesis between AgNO and NaX (X = Cl, Br, I) and AgXNO Double-Salt Formation.

Here we describe real-time, monitoring of mechanochemical solid-state metathesis between silver nitrate and the entire series of sodium halides, on the basis of tandem powder X-ray diffraction and Raman spectroscopy monitoring. The mechanistic monitoring reveals that reactions of AgNO with NaX (X = Cl, Br, I) differ in reaction paths, with only the reaction with NaBr providing the NaNO and AgX products directly. The reaction with NaI revealed the presence of a novel, short-lived intermediate phase, while the reaction with NaCl progressed the slowest through the well-defined AgClNO intermediate double salt.

In-Situ and Real-time Monitoring of Mechanochemical Preparation of Li Mg(NH BH ) and Na Mg(NH BH ) and Their Thermal Dehydrogenation.

For the first time, in situ monitoring of uninterrupted mechanochemical synthesis of two bimetallic amidoboranes, M Mg(NH BH ) (M=Li, Na), by means of Raman spectroscopy, has been applied. This approach allowed real-time observation of key intermediate phases, and a straightforward follow-up of the reaction course. Detailed analysis of time-dependent spectra revealed a two-step mechanism through MNH BH ⋅NH BH adducts as key intermediate phases which further reacted with MgH , giving M Mg(NH BH ) as final products.