Unambiguous evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion in CuZSM-5 zeolite

Atsushi Itadani, Yasushige Kuroda, Masashi Tanaka, Mahiko Nagao

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15 Citations (Scopus)

Abstract

By combining the methods of calorimetry and spectroscopy using CO as a probe molecule, we obtained the evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion (Cu+) species in CuZSM-5 zeolite. These Cu+ species showed the characteristic emission bands at 21,000 and 18,500 cm-1 and, respectively, gave the CO adsorption heats of 122 and 110 kJ mol-1. Taking account of our previous EXAFS data, it was found that the former species take the two-coordinated structure involving lattice oxygen atoms, while the latter ones the three-coordinated structure. In this paper, we also emphasized the validity of our original assignment of active sites on CuZSM-5 for N2 adsorption at room temperature; three-coordinated Cu+ species adsorb N2 molecules.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume86
Issue number1-3
DOIs
Publication statusPublished - Nov 28 2005

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Keywords

  • CO adsorption
  • CuZSM-5
  • Monovalent copper-ion
  • N adsorption
  • NO decomposition

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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