Environmental Applications of Zeolites: Preparation and Screening of Cu-Modified Zeolites as Potential CO Sensors

Jendrlin, Martin; Grand, Julien; Lakiss, Louwanda; Bazin, Philippe; Mintova, Svetlana; Zholobenko, Vladimir

Abstract

This work is focused on the application of Cu-containing zeolites as potential environmental sensors for monitoring carbon monoxide. A number of commercial zeolites with different structural properties (NaX, NaY, MOR, FER, BEA and ZSM-5) were modified using CuSO4, Cu(NO3)2 and Cu(OAc)2 solutions as copper sources to prepare Cu+-containing zeolites, since Cu+ forms stable complexes with CO at room temperature that can be monitored by infrared spectroscopy. Zeolite impregnation with Cu(NO3)2 resulted in the highest total Cu-loadings, while the Cu(OAc)2-treated samples had the highest Cu+/Cutotal ratio. Cu(NO3)2-impregnated MOR, which displayed the highest concentration of Cu+, was subjected to a number of tests to evaluate its performance as a potential CO sensor. The working temperature and concentration ranges of the sensor were determined to be from 20 to 300 °C and from 10 to 10,000 ppm, respectively. The stepwise CO desorption experiments indicated that the sensor can be regenerated at 400 °C if required. Additional analyses under realistic flow conditions demonstrated that for hydrophilic zeolites, the co-adsorption of water can compromise the sensor’s performance. Therefore, a hydrophobic Sn-BEA was utilised as a parent material for the preparation of an impregnated Cu-Sn-BEA zeolite, which exhibited superior resistance to interfering water while maintaining its sensing properties. Overall, the prepared Cu-modified zeolites showed promising potential as environmental CO sensors, displaying high sensitivity and selectivity under representative testing conditions.

Citation

Jendrlin, M., Grand, J., Lakiss, L., Bazin, P., Mintova, S., & Zholobenko, V. (in press). Environmental Applications of Zeolites: Preparation and Screening of Cu-Modified Zeolites as Potential CO Sensors. Chemistry, 5(1), 314-333. https://doi.org/10.3390/chemistry5010024

• Journal Article Type: Article
• Acceptance Date: Feb 16, 2023
• Online Publication Date: Feb 20, 2023
• Deposit Date: Aug 13, 2025
• Journal: Chemistry
• Print ISSN: 2624-8549
• Electronic ISSN: 2624-8549
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 1
• Pages: 314-333
• DOI: https://doi.org/10.3390/chemistry5010024
• Public URL: https://keele-repository.worktribe.com/output/955759
• Publisher URL: https://www.mdpi.com/2624-8549/5/1/24