Journal
APPLIED SURFACE SCIENCE
Volume 420, Issue -, Pages 740-745Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.05.182
Keywords
Hydrogen storage; Dehydrogenation; Nanocatalysis; Activation energy; Crystal structure; Reaction mechanism
Categories
Funding
- FCT (Portugal) [SFRH/BPD/88756/2012]
- FCT
- FEDER
- COMPETE [EXPL/EMS-ENE/1497/2013, IF/01344/2014/CP1222/CT0001]
- FCT [SFRH/BPD/76184/2011]
- Fundação para a Ciência e a Tecnologia [EXPL/EMS-ENE/1497/2013] Funding Source: FCT
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The present study explores how the additive titania chemically reacts with magnesium hydride and influences the dehydrogenation of MgH2. Quantitative X - ray diffraction study of ball milled MgH2 + xTiO(2) (x = 0.25, 0.33, 0.5 and 1) suggests that Ti substituted MgO is the main reaction product in all the product powders. Convincing evidence is obtained to conclude that Ti dissolution in MgO makes a dramatic behavioral change to MgO; passive MgO turns as an active in-built catalyst. The analysis correlating the dehydrogenation kinetics, composition of in-situ catalyst and sample durability suggests that effectiveness of Ti substituted MgO (MgxTiyOx+y) as a catalyst for MgH2 depends on the concentration of Ti in MgxTiyOx+y rock salt. These observations are immensely helpful for understanding the hydrogen desorption mechanism of metal oxide additives loaded MgH2 system. (C) 2017 Elsevier B.V. All rights reserved.
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