Intermetallic Hydrides [TiFe0.95Zr0.03Mo0.02]Hx (0 ≤ x ≤ 2): The Nature of the Phase Responsible for the Selective Reduction of CO2 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2003-03

AUTHORS

D. I. Kochubei, V. V. Kriventsov, Yu. V. Maksimov, M. V. Tsodikov, F. A. Yandieva, V. P. Mordvin, J. A. Navio, I. I. Moiseev

ABSTRACT

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

PAGES

165-174

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1023392126234

DOI

http://dx.doi.org/10.1023/a:1023392126234

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1030620106


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