Titration of Cu(I) Sites in Cu-ZSM-5 by Volumetric CO Adsorption.

ABSTRACT: Cu-exchanged zeolites are widely studied materials because of their importance in industrial energetic and environmental processes. Cu redox speciation lies at the center of many of these processes but is experimentally difficult to investigate in a quantitative manner with regular laboratory equipment. This work presents a novel technique for this purpose that exploits the selective adsorption of CO over accessible Cu(I) sites to quantify them. In particular, isothermal volumetric adsorption measurements are performed at 50 °C on a series of opportunely pre-reduced Cu-ZSM-5 to assess the relative fraction of Cu(I); the setup is fairly simple and only requires a regular volumetric adsorption apparatus to perform the actual measurement. Repeatability tests are carried out on the measurement

SUBMITTER: Deplano G 

PROVIDER: S-EPMC9100488 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature