PREPARASI ALLOY Fe/Al DENGAN VARIASI KOMPOSISI DAN APLIKASINYA SEBAGAI PENYIMPAN HIDROGEN DALAM SISTEM METAL HIDRIDA

RAMADHANA, AGATHIS and Rohendi, Dedi and Rachmat, Addy (2020) PREPARASI ALLOY Fe/Al DENGAN VARIASI KOMPOSISI DAN APLIKASINYA SEBAGAI PENYIMPAN HIDROGEN DALAM SISTEM METAL HIDRIDA. Undergraduate thesis, Sriwijaya University.

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Abstract

Fe3Al, FeAl3 and Fe2Al5 alloys for hydrogen storage were successfully synthesized using Mechanical Alloying method with a combination of Fe and Al metals. Alloy Fe/Al made in the composition of Al by 13.87% w/w; 59.18% w/w and 54.71% w/w in a milling time for 5 and 15 hours. Alloys were characterized using XRD and their adsorption desorption performance were tested. Alloys with the largest adsorption and desorption capacities were characterized using SEM-EDX. The XRD characterization for Fe3Al alloys shows typical peaks at 44,798 (5 hours milling), 47.9 and 60.26 (15 hours milling). Alloy Fe2Al5 shows typical peaks at 44, 65 and 78 (5 hour milling), 44 and 64 (15 hour milling). Meanwhile, FeAl3 alloy has typical peaks at 38, 44 and 64 (5 hour milling), 38 and 44 (15 hour milling). The alloy which was successfully synthesized and according to JCPDS with a large crystallinity size was applied as a hydrogen storage material in the form of metal hydride. The results showed that the capacity of hydrogen adsorption increases with increasing pressure, but the adsorption capacity decreases with increasing temperature. Alloy with the highest adsorption and desorption capacities were produced from Fe3Al alloy with adsorption capacity of 31.82% w/w at 3 bar pressure and 30C temperature. Meanwhile, its desorption capacity is 31.65% w/w at a temperature of 30C. SEM-EDX characterization was carried out on Fe3Al alloys which were milled for 5 hours and produced granules sizes and different compositions between before and after hydrogen adsorption. The granular size of the alloy before adsorption is smaller than the alloy after adsorption. Meanwhile, the composition in the alloy before adsorption is less than in the alloy after adsorption. Thermodynamic analysis of hydrogen adsorption at temperature variations for each alloy occur spontaneously because Gibbs free energy is negative and H is smaller than TS. Enthalpy (H) and entropy (S) adsorption are positive which indicates that the adsorption occur endothermic and increases the chance of the adsorption reaction occur spontaneously. The results showed the lowest Gibbs free energy at 323 K with a value of -0.3301 kJ/mol for Fe3Al alloys. Values of G < 0 and H > 0 indicate that the reaction is spontaneous and endothermic.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Metal Hidrida, Adsorpsi hidrogen, Fe3Al, FeAl3, Fe2Al5
Subjects: T Technology > TP Chemical technology > TP1-1185 Chemical technology > TP159.C3.A348 Catalysts. TECHNOLOGY & ENGINEERING / Material Science
Divisions: Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User: Agathis Ramadhana
Date Deposited: 03 Aug 2020 07:12
Last Modified: 03 Aug 2020 07:12
URI: http://repository.unsri.ac.id/id/eprint/32001

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