FTIR study of low-temperature CO adsorption on Cu-ZSM-5: Evidence of the formation of Cu{sup 2+}(CO){sub 2} species
CO adsorption at ambient temperature leads to formation of the well-known Cu{sup +}-CO species (2,158 cm{sup {minus}1}) and Cu{sup +}(CO){sub 2} dicarbonyls (2,177 and 2,150 cm{sup {minus}1}). In addition, Cu{sup 2+}-CO complexes (2,179 cm{sup {minus}1}) appear under equilibrium CO pressure and are very easily destroyed by evacuation. The CO stretching frequency almost coincides in position with {nu}{sub s} of the Cu{sup +}(CO){sub 2} species. Lowering the temperature in the presence of gas-phase CO leads to formation of Cu{sup 2+}(CO){sub 2} geminal dicarbonyls (2,170 cm{sup {minus}1}) and a small amount of Cu{sup +}(CO){sub 3} tricarbonyls (evidenced by a band at 2,191 cm{sup {minus}1}). The results demonstrate the high coordinative unsaturation of both Cu{sup +} and Cu{sup 2+} ions in Cu-ZSM-5.
- Research Organization:
- Bulgarian Academy of Sciences, Inst. of General and Inorganic Chemistry, Sofia (BG)
- OSTI ID:
- 20030529
- Journal Information:
- Journal of Catalysis, Vol. 191, Issue 2; Other Information: PBD: 25 Apr 2000; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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