Characterization of H and Cu mordenites with varying SiO2/Al2O3 ratios, by optical spectroscopy, MAS NMR of 29Si, 27Al and 1H, temperature programmed desorption and catalytic activity for nitrogen oxide reduction

V. Petranovskii, R. F. Marzke, G. Diaz, A. Gomez, N. Bogdanchikova, S. Fuentes, N. Katada, A. Pestryakov, V. Gurin

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

H-mordenites (HMor) with variable SiO2/Al2O3 molar ratio (MR) varying from 10 to 206 were incorporated with copper (CuMor). Maximum total acidity and maximum concentration of the strongest acid sites were found for MR=15 (HMor15). This sample has the lowest micropore and mesopore content, but also show strongly disordered Si sites in the crystalline lattice. A consistent finding has been the disappearance of the NMR line from extra- framework 27Al, whenever Cu is present. The reducibility of copper ions and stability of reduced species depend on MR. The MR also influences optical lineshapes from different reduced species of Cu. A plasmon resonance band at 580 nm, due to small Cu particles formed in the zeolite, occurs at low and high MR but not at MR=15. Catalytic tests of NO conversion reveal that the reduced Cu-mordenites with MR=15 are the most stable and active ones.

Original languageEnglish (US)
Pages (from-to)815-822
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume142 A
DOIs
StatePublished - Jan 1 2002

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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