Experimental investigation of the grain size dependence of the hydrolysis of LiH powder

• Published in: Powder technology Vol. 208; no. 2; pp. 318 - 323
• Main Authors: Maupoix, C., Houzelot, J.L., Sciora, E., Gaillard, G., Charton, S., Saviot, L., Bernard, F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 25.03.2011; Elsevier
• Subjects: Applied sciences; Chemical engineering; Condensed Matter; Exact sciences and technology; Grain size; Gravimetric analysis; Hydrolysis; Hydroxides; Lithium; Lithium hydride; Materials Science; Mathematical models; Miscellaneous; Partial pressure; Particle size; Physics; Raman spectroscopy; reaction mechanisms; Reactors; Shrinking core model; Solid-solid systems; water; X-ray diffraction; Hydrolysis; Shrinking core model; Particle size; Lithium hydride; Grain size; Gravimetric analysis; Conversion rate; X ray diffraction; Modeling; Powder; Partial pressure; Chemical reaction; Size effect
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2010.08.023

The hydrolysis reaction of LiH powder has been investigated in order to determine the products, rates and mechanisms of this reaction and the influence of the experimental parameters. Raman spectroscopy, X-ray diffraction and gravimetric analysis were used. It was shown that the product of hydrolysis was the hydroxide of lithium (LiOH) for low partial pressure of water (≈50 Pa) and LiOH·H 2O for a higher partial pressure of water (>2000 Pa). Moreover, data obtained using gravimetric analysis inside a glove box containing a controlled partial pressure of water (500 ppmv/50 Pa at 25 °C) were used to determine the rate of the reaction versus particle size. The experimental results were consistent with the shrinking core model showing that initially, the conversion rate is controlled by the chemical reaction. The hydrolysis reaction of LiH powder has been investigated in order to determine the products, rates and mechanisms of this reaction and the influence of the experimental parameters. It was shown that the product of hydrolysis was the hydroxide of lithium (LiOH) for low partial pressure of water (≈50 Pa) and LiOH·H 2O for a higher partial pressure of water (>2000 Pa). The experimental results obtained by gravimetric analysis were consistent with the shrinking core model. ▪