Publication costs assisted by the Petroleum Research Fund Optical absorption and emission spectra have been used to study the reduction of Cu(II) and Cu(I) exchanged zeolites by hydrogen. The emission of Cu(I) was identified as a spin-forbidden transition *Ai (JS0) -3E (3D3). Additional intermediates were found spectroscopically, possibly involving copper hydride and isolated copper atoms. The final product is metallic copper in various states of agglomeration, characterized by an absorption edge at 17 000 cm"1.

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