N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites

Bryan Bromley, Chiara Pischetola, Linda Nikoshvili, Fernando Cardenas-Lizana, Lioubov Kiwi-Minsker

Research output: Contribution to journalArticle

Abstract

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 the feed irreversibly reduced the amount of active sites.

Original languageEnglish
Article number3867
JournalMolecules
Volume25
Issue number17
DOIs
Publication statusPublished - 25 Aug 2020

Keywords

  • FeZSM-5 activation
  • N2O decomposition
  • NO and O2 temperature programmed desorption
  • transient response
  • α-sites formation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Fingerprint Dive into the research topics of 'N<sub>2</sub>O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites'. Together they form a unique fingerprint.

  • Cite this