Effect of Ni and SAPO-34 co-additive on enhancing hydrogen storage performance of MgH2 |
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| Authors: | Senliang Xi Xiaojun Wang Kudzaishe Caren Tome Tonghuan Zhang Zongying Han Meng Gao Shixue Zhou Hao Yu |
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| Affiliation: | 1. College of Chemical and Biological Engineering, Shandong University of Science and Technology, 266590 Qingdao, China;2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | The hydrogen storage performances of MgH2 improved by the addition of Ni and SAPO-34 were studied in detail. The mixture of MgH2 with Ni and SAPO-34 was a physical reaction as shown by the X-ray diffraction (XRD) results. The SAPO-34 and Ni were uniformly distributed on the surface of MgH2. The thermodynamic and kinetic properties of 90MgH2/5Ni/5SAPO-34 were investigated by differential scanning calorimetry (DSC) and pressure-composition-isothermal (PCI) methods. The results showed that the dehydrogenation activation energy of 90MgH2/5Ni/5SAPO-34 decreased by 64.3 kJ/mol compared with that of MgH2. In addition, the relationship between the value of dehydrogenation heat and hydrogen content was also investigated by in-situ calorimetry. The enthalpy value of each sample in the dehydrogenation processes were calculated by in-situ calorimetry measurement. The dehydrogenation enthalpies of as-milled MgH2 and 90MgH2/5Ni/5SAPO-34 were 63.2 kJ/mol H2 and 53.6 kJ/mol H2, respectively. Thus, the co-doping of Ni and SAPO-34 contributed significantly to decrease the thermodynamic stability and improve the hydrogen sorption kinetic properties of MgH2. |
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| Keywords: | SAPO-34 Ni Ball milling Sorption kinetics In-situ calorimetry measurement |
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