STUDY OF SORPTION KINETICS IN METAL HYDRIDE PAIRS

We present the results of studying sorption processes in metal hydride pairs. Technique and laboratory setup are developed for experimental study of kinetics and determination of the duration of interaction between hydrogen and hydrides formed upon saturation of two intermetallic compounds (IMC) of different compositions. The design of the setup and principle of operation are presented. The setup includes two steel retorts which contain the alloys capable of multicycle reversible sorption of hydrogen with formation of the high- and low-temperature hydrides. The system provides measurements of pressure in the hydrogen pipeline between the retorts and temperature of circulating or stirred heat carriers which cool the retorts during sorption and heat them during desorption. The dynamics of hydrogen pressure change in the pipeline and temperature of the heat carrier under simultaneous operation of two hydrides of alloys Mm_1–yLa_yNi₄Co and LaNi_5–xAl_x are studied. The duration of hydrogen desorption from the first hydride with simultaneous sorption by the second one is determined. The thermal balance for the low-temperature module of the setup was calculated to prove the obtained kinetic characteristics. Similar results were obtained for desorption of hydrogen from high-temperature metal hydride. The technique and results can be used for simulation of sorption processes in metal hydride pair and determination of the parameters of optimal design for efficient operation of sorption heat pumps.

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