Molecules, Vol. 25, Pages 3867: N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites

Molecules, Vol. 25, Pages 3867: N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites
Molecules doi: 10.3390/molecules25173867
Authors:
Bryan Bromley
Chiara Pischetola
Linda Nikoshvili
Fernando Cárdenas-Lizana
Lioubov Kiwi-Minsker

We have carried out a systematic investigation of the critical activation parameters (i.e., final temperature (673–1273 K), atmosphere (He vs. O2/He), and final isothermal hold (1 min–15 h) on the generation of “α-sites”, responsible for the direct N2O decomposition over Fe-ZSM-5 (Fe content = 1200–2300 ppm). The concentration of α-sites was determined by (ia) transient response of N2O and (ib) CO at 523 K, and (ii) temperature programmed desorption (TPD) following nitrous oxide decomposition. Transient response analysis was consistent with decomposition of N2O to generate (i) “active” α-oxygen that participates in the low-temperature CO→CO2 oxidation and (ii) “non-active” oxygen strongly adsorbed that is not released during TPD. For the first time, we were able to quantify the formation of α-sites, which requires a high temperature (>973) treatment of Fe-ZSM-5 in He over a short period of time (<1 h). In contrast, prolonged high temperature treatment (1273 K) and the presence of O2 in th...

Source: Molecules - August 24, 2020 Category: Chemistry Authors: Bryan Bromley Chiara Pischetola Linda Nikoshvili Fernando C árdenas-Lizana Lioubov Kiwi-Minsker Tags: Article Source Type: research