Catalytic effect of halide additives ball milled with magnesium hydride

• Published in: International journal of hydrogen energy Vol. 35; no. 4; pp. 1706 - 1712
• Main Authors: Malka, I.E., Czujko, T., Bystrzycki, J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-02-2010; Elsevier
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Ball milling; Catalysis; Catalysts; Decomposition; Dehydriding properties; Differential scanning calorimetry; Energy; Exact sciences and technology; Fuels; Halides; Hydrides; Hydrogen; Hydrogen storage; Magnesium; Magnesium hydride; Periodic table; Ball milling; Hydrogen storage; Magnesium hydride; Catalysts; Halides; Dehydriding properties; Differential scanning calorimetry; Ball mill; Desorption; Additive; Oxidation; Activation energy; Catalyst
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2009.12.024

The influence of various halide additives milled with magnesium hydride (MgH
2) on its decomposition temperature was studied. The optimum amount of halide additive and milling conditions were evaluated.
The MgH
2 decomposition temperature and energy of activation reduction were measured by temperature programmed desorption (TPD) and differential scanning calorimetry (DSC). The difference in catalytic efficiency between chlorides and fluorides of the various metals studied is presented. The effects of oxidation state, valence and position in the periodic table for selected halides on MgH
2 decomposition temperature were also studied.
The best catalysts, from the halides studied, for magnesium hydride decomposition were ZrF
4, TaF
5, NbF
5, VCl
3 and TiCl
3.