Investigation of Catalytic Effects and Compositional Variations in Desorption Characteristics of LiNH2-nanoMgH2

Applied Sciences

Yogi Goswami¹  Dervis Emre Demirocak²  Sesha S. Srinivasan³  Elias Stefanakos⁴ 

[1] Industrial Engineering, Texas A&;Department of Mechanical &Department of Physics, Florida Polytechnic University, 4700 Research Way, Lakeland, FL 33805, USA;M University-Kingsville, Kingsville, TX 78363, USA;

关键词: hydrogen storage;    complex hydrides;    nanocatalyst;    LiNH2;    MgH2;    ball milling;   

DOI  :  10.3390/app7070701

来源: DOAJ

【 摘 要 】

LiNH2 and a pre-processed nanoMgH2 with 1:1 and 2:1 molar ratios were mechano-chemically milled in a high-energy planetary ball mill under inert atmosphere, and at room temperature and atmospheric pressure. Based on the thermogravimetric analysis (TGA) experiments, 2LiNH2-nanoMgH2 demonstrated superior desorption characteristics when compared to the LiNH2-nanoMgH2. The TGA studies also revealed that doping 2LiNH2-nanoMgH2 base material with 2 wt. % nanoNi catalyst enhances the sorption kinetics at lower temperatures. Additional investigation of different catalysts showed improved reaction kinetics (weight percentage of H2 released per minute) of the order TiF3 > nanoNi > nanoTi > nanoCo > nanoFe > multiwall carbon nanotube (MWCNT), and reduction in the on-set decomposition temperatures of the order nanoCo > TiF3 > nanoTi > nanoFe > nanoNi > MWCNT for the base material 2LiNH2-nanoMgH2. Pristine and catalyst-doped 2LiNH2-nanoMgH2 samples were further probed by X-ray diffraction, Fourier transform infrared spectroscopy, transmission and scanning electron microscopies, thermal programmed desorption and pressure-composition-temperature measurements to better understand the improved performance of the catalyst-doped samples, and the results are discussed.

【 授权许可】

Unknown