Kinetic enhancement of the sorption properties of MgH2 with the additive titanium isopropoxide. (23rd February 2017)

• Record Type: Journal Article
• Authors: Alsabawi, K.; Webb, T.A.; Gray, E.MacA.; Webb, C.J.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 8(2017)
• Page Start: 5227
• Page End: 5234
• Publication Date: 2017-02-23
• Subjects: Magnesium hydride -- Hydrogen storage -- Catalyst -- Sorption kinetics; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.12.072
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The effect of titanium isopropoxide (TTIP) on the kinetics of absorption and desorption of magnesium hydride was compared to the benchmark additive niobium oxide (Nb2 O5 ). A systematic survey was performed for ball-milled MgH2 mixed with up to 2 mol% TTIP or Nb2 O5 additive for different ball-milling times. It was found that TTIP was just as effective as Nb2 O5 for the enhancement of the kinetics of absorption and desorption and that 0.5 mol% was sufficient. The TTIP composite sample had superior hydrogen capacity compared to the Nb2 O5 composite sample. As TTIP is a liquid at room temperature, 30 min ball-milling with the magnesium hydride was sufficient time for mixing. Hand mixing the TTIP with MgH2 demonstrated excellent desorption kinetics but the absorption kinetics were poorer compared to ball-milling. Highlights: Study of titanium isopropoxide added to magnesium hydride. Comparison of MgH2 sorption kinetics with niobium oxide. Kinetics of magnesium hydride desorption and absorption equal to niobium oxide. Systematic survey of the effect of ball-milling time and amount of additive.