Peculiarities in the formation of spinels with the composition Mn-Al = 1: 1 in oxidizing, inert or reducing media

Olga A. Bulavchenko, Tatyana N. Afonasenko, Pavel G. Tsyrul'nikov, Svetlana V. Cherepanova, Sergey V. Tsybulya

Research output: Contribution to journalArticlepeer-review

Abstract

The study revealed peculiarities in the formation of mixed oxides with the Mn3-xAlxO4 spinel structure that were obtained from initial simple oxides β-Mn3O4 and γ-Al2O3 by calcination in various media at 600–1200 °C. The phase composition of the samples treated in air, argon or hydrogen was investigated using ex situ and in situ X-ray diffraction. It was shown that the occurrence of phase transformations depends on the treatment conditions and is related to the charge state of manganese cations. A scheme of the structural transformations induced by temperature and medium was proposed. The formation temperature of spinel was found to decreases from 950 to 600 °C when the oxidizing medium is replaced by the reducing one. Mn3-xAlxO4 spinel (x ∼ 1.5) was produced in air at temperatures above 1050 °C or in an inert medium at 800–1200 °C.

Original languageEnglish
Pages (from-to)37-41
Number of pages5
JournalMaterials Chemistry and Physics
Volume216
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Aluminum oxide
  • In situ XRD
  • Manganese oxide
  • Phase transformation
  • Spinel
  • COMBUSTION
  • TOTAL OXIDATION CATALYSTS
  • MN-AL-O
  • CO OXIDATION
  • MANGANESE OXIDE
  • ALUMINA
  • PHASE-COMPOSITION
  • THERMAL-ACTIVATION
  • X-RAY
  • MN1.5AL1.5O4

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