Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (12): 2323-2327.doi: 10.3866/PKU.WHXB201410081

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Hydriding/Dehydriding Properties of an MgH2+20%(w) MgTiO3 Composite

WANG Jia-Sheng1, HAN Shu-Min1,2, LI Yuan1, SHEN Na1, ZHANG Wei1   

  1. 1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China;
    2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China
  • Received:2014-07-14 Revised:2014-10-08 Published:2014-11-27
  • Contact: HAN Shu-Min
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50971112, 51001043) and Scientific Research Projects in Colleges and Universities in Hebei Province, China (ZD2014004).


With the aim of decreasing the dehydriding temperature and improving the hydriding/dehydriding kinetic properties of MgH2, we prepared MgH2+20%(w) MgTiO3 composite via ball-milling, and investigated the hydrogen storage properties of the composite. X- ray diffraction (XRD) results showed that the MgTiO3 decomposed into Mg2TiO4 and TiO2 during the ball-milling. These two resulting compounds remained stable during the hydriding/dehydriding processes, working as catalysts for the hydriding/dehydriding. Temperatureprogrammed- desorption (TPD) and hydriding/dehydriding kinetics tests showed that doping MgH2 with MgTiO3 lowered the onset dehydrogenation temperature of MgH2 from 389 to 249 ℃, as well as increasing the hydrogen absorption amount from 0.977%(w) to 2.902%(w) at 150 ℃, and increasing the desorption amount from 2.319% (w) to 3.653%(w) at 350 ℃. The MgTiO3 additive decreased the dehydriding activation energy of MgH2 from 116 to 95.7 kJ·mol-1. The thermodynamic and kinetic performance of the MgH2+20%(w) MgTiO3 composite was significantly improved compared with pristine MgH2, which was attributed to the high catalytic activity of the (insitu formed) TiO2 and Mg2TiO4 during the ball-milling and dehydriding processes.

Key words: Hydrogen storage property, MgH2, MgTiO3, Catalytic activity, Activation energy


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