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Contributions of phase composition and defect structure to the long term stability of Li/MgO catalysts

  • Ulla Simon , Manuel Harth , Sebastian Arndt , Almuth Berthold , Oliver Görke , Carsten Hartmann , Reinhard Schomäcker and Helmut Schubert
Published/Copyright: May 31, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 103 Issue 12

Abstract

The phase composition and defect structure of the system Li2O–MgO was investigated in terms of the long term stability of Li/MgO catalysts. The Li content was varied from 0 to 7 mol.%. Pure Li · MgO solid solutions were prepared via a special washing procedure. Li contents below 0.04 wt.% were stabilized within the MgO host lattice, whereas higher Li contents were found to segregate as Li2O and Li2CO3 phases. The catalytic activity in the oxidative coupling of methane was found to decay for all catalysts over a period of 19 h on stream, accompanied by a loss of Li as LiOH. Li in the Li · MgO solid solution was found to be more stable in the lattice than in the surface region of the solid. However, impedance measurements on transition metal stabilized Li/MgO catalysts indicated that even the Li ions within the Li · MgO solid solution are not sufficiently stabilized. Thus, neither the Li compounds nor the dissolved Li ions within the Li/MgO solution seem to be truly stable at 750°C under catalytic conditions.

Keywords: Li/MgO; Oxidative coupling of methane; Deactivation; Defect structure; Solid solution
* Correspondence address, Dr. Oliver Görke, Hardenbergstraße 40, 10623 Berlin, Germany. Tel.: 0049-(0)30-314-24976, Fax: 0049-(0)30-314-28534, E-mail:

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Received: 2011-7-18
Accepted: 2012-6-12
Published Online: 2013-05-31
Published in Print: 2012-12-01

© 2012, Carl Hanser Verlag, München

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  6. Isochronal annealing of a deformed Fe-7.5 mass.% Si-steel
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https://doi.org/10.3139/146.110812
Keywords for this article
Li/MgO; Oxidative coupling of methane; Deactivation; Defect structure; Solid solution

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of texture on grain growth in an interstitial-free steel sheet
  5. Nanoindentation of pseudoelastic NiTi containing Ni4Ti3 precipitates
  6. Isochronal annealing of a deformed Fe-7.5 mass.% Si-steel
  7. Modelling of three powder compaction laws for cold die pressing
  8. Surface tension and density of liquid Sn–Ag–Cu alloys
  9. Thermodynamics of liquid Au–Sb–Sn
  10. Phase relations in the ZrO2-Sm2O3-Y2O3-Al2O3 system: experimental investigation and thermodynamic modelling
  11. Contributions of phase composition and defect structure to the long term stability of Li/MgO catalysts
  12. First and second differentials of the ultrasonic parameter as an effective tool to identify phase transitions in R1-xAxMnO3 perovskites
  13. Surface oxide layer formation on Au-Pt-Pd-Si alloys for dental resin restorations
  14. On the high temperature stability of γ-Al2O3/Ti0.33Al0.67N coated WC–Co cutting inserts
  15. Optimizing composition for (Nd, Pr)–Nb–Fe–B hard magnetic nanocomposites
  16. Simple ionic-liquid assisted method for preparation of Cd1-xZnxS nanoparticles with improved photocatalytic activity
  17. A low-cost route for synthesizing tungsten disulfide film composites from abundant sprayed oxides: Technique and characterization
  18. Anodic behavior of Al–Zn–In sacrificial anodes at different concentration of zinc and indium
  19. Short Communications
  20. Effect of molybdenum addition on fracture toughness and hardness of Fe2B in Fe–B–C cast alloy
  21. DGM News
  22. DGM News
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