Catalysis Today, Vol.100, No.3-4, 407-412, 2005
The interaction of butenes with Cu+ ions in CuMCM-41 studied by IR spectroscopy
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 C=C bond, what resulted in a frequency shift of C=C stretching band by about 100 cm(-1). Moreover, the vibration of C-H bonds in =CH2 and =C-H groups neighbouring to the double bonds was also perturbed. We suppose that the activation of C=C bond is a result of pi-back donation of d electrons of Cu+ to pi* 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 Bronsted 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. (c) 2004 Elsevier B.V. All rights reserved.