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Reduction specifics of rare-earth orthovanadates (REE = La, Nd, Sm, Dy, Ho, Er, Tm, Yb, and Lu)

  • Physical Methods of Investigation
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Abstract

The reduction specifics of REE orthovanadates LnVO4 (Ln = La, Nd, Sm, Dy, Ho, Er, Tm, Yb, and Lu) have been studied using the temperature-programmed reduction (TPR) method. Hydrogen and carbon monoxide were chosen as reducing agents. The reduction temperature is found to depend both on the REE and the reducing agent. REE orthovanadates are reduced in the range 1033–1153 K not forming phases that contain vanadium in intermediate oxidation states. In CO, the reduction temperature is found to be higher than in H2 for all orthovanadates. TPR data have been used to calculate the activation energies of reduction of REE orthovanadates using the Kissinger equation. The effective activation energies of reduction depend on the REE and the reducing agent and are in the range 41–147 kJ/mol.

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Authors and Affiliations

  1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia

    A. S. Lyadov

  2. Russian University of Peoples’ Friendship, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia

    V. V. Kurilkin

Authors
  1. A. S. Lyadov
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  2. V. V. Kurilkin
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Correspondence to A. S. Lyadov.

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Original Russian Text © A.S. Lyadov, V.V. Kurilkin, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 1, pp. 92–98.

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Lyadov, A.S., Kurilkin, V.V. Reduction specifics of rare-earth orthovanadates (REE = La, Nd, Sm, Dy, Ho, Er, Tm, Yb, and Lu). Russ. J. Inorg. Chem. 61, 86–92 (2016). https://doi.org/10.1134/S0036023616010150

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  • DOI: https://doi.org/10.1134/S0036023616010150

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