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A combined Fourier transform IR (FT-IR) and electron paramagnetic resonance (EPR) study shows that copper in ‘excessively exchanged’ Cu/ZSM-5 is initially present as OH bridged Cu 2+ dimers, besides isolated Cu 2+ ions. Upon heating, the dimers lose water and become oxygen bridged [Cu-O-Cu] 2+ complexes. These are ‘EPR-silent’, presumably as a consequence of antiferromagnetic...
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