| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 50096 | Catalysis Communications | 2012 | 5 Pages |
Co-doping of Li/MgO, a well-known catalyst for the oxidative coupling of methane, was investigated. It is demonstrated that Gd3+ and Fe3+ can be used as spin sensors in these solids to investigate the structure via EPR spectroscopy. These aliovalent ions occupy Mg2+ sites in the lattice; the expected coupling with charge-compensating neighboring Li+ was detected. A strong increase of the activity was observed. However, all samples suffered from deactivation. The solubility of Gd3+ in MgO turned out to be inhibited. No such restriction was observed for Fe3+.
► Li/MgO doped with Gd and Fe resulted in the ternary catalysts. ► EPR revealed charge-compensating coupling of the dopant with the Li+. ► Catalysts deactivate, indicating that instability cannot be suppressed by doping.
