Cost reduction possibilities of vanadium-based solid solutions – Microstructural, thermodynamic, cyclic and environmental effects of ferrovanadium substitution
2015; Elsevier BV; Volume: 648; Linguagem: Inglês
10.1016/j.jallcom.2015.07.110
ISSN1873-4669
AutoresUlrich Ulmer, Kohta Asano, Andreas Patyk, Hirotoshi Enoki, Yumiko Nakamura, Alexander Pohl, Roland Dittmeyer, Maximilian Fichtner,
Tópico(s)Catalysis and Hydrodesulfurization Studies
ResumoMicrostructural changes, thermodynamic and cyclic properties, total material cost and the cumulative energy demand of V(40−40·x)Fe(8−8·x)Ti26Cr26(FeV)(48·x) with 0 ≤ x ≤ 0.9 using commercial ferrovanadium (FeV) are investigated. The substitution of V + Fe by FeV (x = 0.9) raises the equilibrium hydrogen pressure at 298 K from pa = 1 MPa to pa = 6 MPa during absorption of H2 and pd = 0.2 MPa and pd = 1 MPa during desorption. The reversible hydrogen storage capacity is determined after 50 pressure-swing cycles and is reduced from 2.2 mass% to 1.7 mass% for the unsubstituted alloy (x = 0) compared to 1.7 mass% to 1.3 mass% for the FeV substituted alloy (x = 0.9). This corresponds to a loss of capacity of approx. 23% for both samples. After taking into account the capacity loss caused by FeV substitution, the raw material cost per 100 kg of stored H is reduced to 1/3 of the original price of the unsubstituted alloy. The cumulative energy demand of pure V depends on the number of purification steps. Ferrovanadium shows a cumulative energy demand which is reduced at least by a factor of 1.4 as compared to high-purity vanadium.
Referência(s)