Intermetallic Hydrides [TiFe 0.95 Zr 0.03 Mo 0.02 ]H x (0 ≤ x ≤ 2): The Nature of the Phase Responsible for the Selective Reduction of CO 2

摘要: Based on data obtained by X-ray diffraction and Mossbauer spectroscopy, it was concluded that tetragonal distortions appeared in the structure of cubic TiFe upon doping with Zr Mo atoms intermetallide TiFe0.95Zr0.03Mo0.02 is formed, which can absorb ∼1 mol H2 per mole intermetallide. The heating hydrogen-saturated Ar to 185°C released ∼0.80–0.82 This hydrogen constituent [TiFe0.95Zr0.03Mo0.02]H1.93 orthorhombic [TiFe0.95Zr0.03Mo0.02]H, are hydride phases parent [TiFe0.95Zr0.03Mo0.02]H2 hydride. remainder (∼0.18 intermetallide), only at 700–920°C, entered γ solution nonstoichiometric TiH2 – x. EXAFS XANES indicate an increase signal intensity Ti–Ti direction a decrease electron density titanium for [TiFe0.95Zr0.03Mo0.02]H0.36. These results were interpreted terms scheme according interstitial solid arranged closer coordinated them. It found phase [TiFe0.95Zr0.03Mo0.02]H0.36, solution, responsible selective reduction CO2 CO (90–98%).