The interaction of butenes with Cu+ ions in CuMCM-41 studied by IR spectroscopy

E. Kukulska-Zaja̧c, N. Kumar, T. Salmi, D. Yu Murzin, J. Datka*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

As CuMCM-41 was found to be active in skeletal isomerisation of n-butenes, we followed by IR spectroscopy the interaction of but-1-ene, cis-but-2-ene, and trans-but-2-ene with Cu+ sites in CuMCM-41. It has been revealed that Cu+ activated strongly CC bond, what resulted in a frequency shift of CC stretching band by about 100 cm-1. Moreover, the vibration of CH bonds in CH2 and CH groups neighbouring to the double bonds was also perturbed. We suppose that the activation of CC bond is a result of π-back donation of d electrons of Cu+ to π * antibonding orbitals of butenes. IR results evidenced also the heterogeneity of Cu+ sites in CuMCM-41 and the presence of Cu+ sites of various electron donor properties. But-1-ene molecules bonded to Cu+ ions are less prone to accept protons from Brønsted acid sites than molecules bonded by hydrogen bonding to non-acidic SiOH groups, even though they are more negative than free or physisorbed molecules. The IR studies of coadsorption of CO and but-1-ene suggest that the interaction of CO with Cu+ is much weaker if but-1-ene is present, than without butene.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalCatalysis Today
Volume100
Issue number3-4
DOIs
Publication statusPublished - 28 Feb 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • Butenes
  • Cu cations
  • IR spectroscopy

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