AFFECTS OF MECHANICAL MILLING AND METAL OXIDE ADDITIVES ON SORPTION KINETICS OF 1:1 LiNH2/MgH2 MIXTURE

The destabilized complex hydride system composed of LiNH{sub 2}:MgH{sub 2} (1:1 molar ratio) is one of the leading candidates of hydrogen storage with a reversible hydrogen storage capacity of 8.1 wt%. A low sorption enthalpy of {approx}32 kJ/mole H{sub 2} was first predicted by Alapati et al. utilizing first principle density function theory (DFT) calculations and has been subsequently confirmed empirically by Lu et al. through differential thermal analysis (DTA). This enthalpy suggests that favorable sorption kinetics should be obtainable at temperatures in the range of 160 C to 200 C. Preliminary experiments reported in the literature indicate that sorption kinetics are substantially lower than expected in this temperature range despite favorable thermodynamics. Systematic isothermal and isobaric sorption experiments were performed using a Sievert's apparatus to form a baseline data set by which to compare kinetic results over the pressure and temperature range anticipated for use of this material as a hydrogen storage media. Various material preparation methods and compositional modifications were performed in attempts to increase the kinetics while lowering the sorption temperatures. This paper outlines the results of these systematic tests and describes a number of beneficial additions which influence kinetics as well as NH{sub 3} formation

Special Issue 2024

Zinātniskā žurnāla “Linguistica Lettica” speciālizlaidums veltīts Latvijas Universitātes Latviešu valodas institūta vadošās pētnieces Laimutes Balodes jubilejai. Veltījumkrājumā apkopoti gan zinātniskie raksti par pētījumiem onomastikā, sociolingvistikā, stilistikā, valodu kontaktos, gan apsveikumraksti izcilajai valodniecei. / The special issue of the scientific journal “Linguistica Lettica” is dedicated to the anniversary of Laimute Balode, the leading researcher of the Latvian Language Institute at the University of Latvia. The festschrift collection contains articles on research in onomastics, sociolinguistics, stylistics, and language contacts, along with greetings to the great linguist