Thesis - Oztek_Muzaffer_T_200508_MA

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3.5 3.0 2.5 Wt. % H absorbed 2.0 1.5 1.0 0.5 0.0 -0.5 0 1000 2000 3000 4000 5000 corrected time (s) 4.5 4.0 3.5 P (atm) 3.0 2.5 2.0 1.5 1.0 0 1000 2000 3000 4000 5000 corrected time (s) Figure 10: Composition and pressure plots for initial hydriding of Mg 2 Ni. 38
The thermogram associated with the subsequent dehydriding of the alloy exhibited an endothermic event, ascribed to the loss of hydrogen from the alloy, at an onset temperature of approximately 230 ºC. The amount of hydrogen released was limited to 0.15% at 250 ºC, which was not sufficiently hot for complete dehydriding. The sample was dehydrided again and 3% H was released at about 350 ºC. The thermogram and the percent hydrogen desorbed plots are given in Figures 11 and 12. In the thermogram, the endothermic peak is followed by two smaller exotherms. The exotherms are due to the re-absorption of the released hydrogen. This re-absorption occurs as the temperature decreases during the cooldown cycle. DSC 111 Heat Flow/mW Exo 100 Figure: Experiment:Tonguc Mg2Ni 2nd dehydriding 20040520_3 Crucible:Steel Atmosphere:H2 20/05/2004 Procedure: hydriding (Zone 1) Mass (mg): 109.5 Sample temperature/°C 350 50 300 250 0 200 -50 150 -100 100 -150 50 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 Time/s Figure 11: Thermogram for dehydriding of Mg 2 Ni. 39
Page 1 and 2: RECOVERY OF HYDROGEN AND HELIUM FRO
Page 3 and 4: ABSTRACT Waste streams of hydrogen
Page 5 and 6: I dedicate this work to my family m
Page 7 and 8: I also would like to cheer for my f
Page 9 and 10: 2.2.2.1. Hydriding and Dehydriding
Page 11 and 12: LIST OF FIGURES Figure 1. Pressure-
Page 13 and 14: Figure 34. Pressure profiles under
Page 15 and 16: 1. INTRODUCTION The focus of this s
Page 17 and 18: ecause of the difference in partial
Page 19 and 20: hydrides by dissolving large amount
Page 21 and 22: hydrogen storage alloy has a specif
Page 23 and 24: • Insensitivity to poisoning by i
Page 25 and 26: hydrogen capacity was not reproduci
Page 27 and 28: showed the lowest plateau pressure
Page 29 and 30: grain boundaries increases the tota
Page 31 and 32: These parameters are generally inte
Page 33 and 34: Figure 4. CaCu5-type P6/mmm structu
Page 35 and 36: In this study, the addition of Al t
Page 37 and 38: 2. EXPERIMENTAL 2.1.Chemicals and R
Page 39 and 40: Figure 5. The high energy Spex 8000
Page 41 and 42: 2.2.1.1. Hydriding and Dehydriding
Page 43 and 44: approximately 5 atm, and heating th
Page 45 and 46: determined by the start and end of
Page 47 and 48: 450 400 coating thickness (Å) 350
Page 49 and 50: 3. RESULTS AND DISCUSSIONS 3.1. Hyd
Page 51: DSC 111 heat flow/mW Exo 300 Figure
Page 55 and 56: total time was broken into three 30
Page 57 and 58: The VTiNi sample was subjected to d
Page 59 and 60: solid solution of hydrogen rather t
Page 61 and 62: DSC 111 Heat Flow/mW 180 Exo Figure
Page 63 and 64: 100 rpm setting, the milling vial w
Page 65 and 66: BPR, 400 rpm, 5 minutes) did not re
Page 67 and 68: Table 1: Effects of various milling
Page 69 and 70: Due to the fast kinetics observed a
Page 71 and 72: The mole % Al after milling was les
Page 73 and 74: Figure 24: Percent hydrogen capacit
Page 75 and 76: the start of the heating period, wh
Page 77 and 78: However, it was noted that the part
Page 79 and 80: percent hydrogen was decreased. The
Page 81 and 82: 3.2.2.4. AuPd and Pt Coating on LaN
Page 83 and 84: 1.0 0.8 (a) (b) Wt. % H absorbed 0.
Page 85 and 86: After dehydriding by the sample, th
Page 87 and 88: 19 18 P (atm) 17 16 15 14 0.74 %Al
Page 89 and 90: GC output, arbitrary units 0 5 10 1
Page 91 and 92: sample was LaNi 5 . This may indica
Page 93 and 94: 30 min. 15 min. Intensity (arb. uni
Page 95 and 96: After milling the percentages of Al
Page 97 and 98: 4. CONCLUSIONS This study has been
Page 99 and 100: 16. Van-Vucht, J.H.N., Kuijpers, F.
Page 101 and 102: 47. Suryanarayana, C., Progress in

Thesis - Oztek_Muzaffer_T_200508_MA

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