In situ FTIR spectroelectrochemical investigations on Cu2+-ZSM-5 modified electrodes. Reactivity of the electrogenerated species towards NO in aqueous solution

摘要

In situ FTIR spectroelectrochemical experiments have been carried out on Cu2+-ZSM-5 with 40 and 100% ion exchange level with Nafion films coated on glassy carbon electrodes, and on the application of these electrodes to the interaction of NO with the electrogenerated species in aqueous solution. Voltammetric results revealed that the reduction of Cu2+-exchanged zeolites proceeds by two successive quasireversible one-electron steps. The first electron gain resulted in the formation of Cu+-ZSM-5. Cathodic peak potential shifts observed in NO-saturated aqueous solution indicated electrogenerated Cu+-ZSM-5-NO interactions. FTIR measurements showed that the Cu+ ions in the electroreduced Cu2+-ZSM-5 form with NO, among others products, Cu+-ZSM-5-nitrosylic complexes. [References: 41]