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

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 super...

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Published inApplied sciences Vol. 7; no. 7; p. 701
Main Authors Srinivasan, Sesha, Demirocak, Dervis, Goswami, Yogi, Stefanakos, Elias
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 07.07.2017
Subjects
Alternative energy sources
Ammonia
Ball milling
Carbon
Catalysts
complex hydrides
Desorption
Fourier analysis
Fourier transforms
Fuel cells
Hydrogen
hydrogen storage
Inert atmospheres
Infrared spectroscopy
Investigations
Kinetics
LiNH2
MgH2
nanocatalyst
Particle size
Reaction kinetics
Room temperature
Scanning electron microscopy
Thermogravimetric analysis
X-ray diffraction
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7070701