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Li/MgO with spin sensors as catalyst for the oxidative coupling of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
50096 46779 2012 5 PDF Available
Title
Li/MgO with spin sensors as catalyst for the oxidative coupling of methane
Abstract

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.

Keywords
Oxidative coupling of methane; Li/MgO; Transition metal oxides; Cation substitution; Spin sensor; EPR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 18, 10 February 2012, Pages 132–136
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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