TY - JOUR
T1 - An Inelastic Neutron Scattering and NIR-FT Raman Spectroscopy Study of Chloroform and Trichloroethylene in Faujasites
AU - Davidson, Anne M.
AU - Mellot, Caroline F.
AU - Eckert, Juergen
AU - Cheetham, Anthony K.
PY - 2000/1/27
Y1 - 2000/1/27
N2 - Molecular information about the nature and the strength of the interactions between chloroform and trichloroethylene (TCE) sorbates and siliceous FAU, NaY, and NaX zeolites was obtained by inelastic neutron scattering (INS) and Raman spectroscopies. The spectral features of the two sorbates differ in terms of their frequencies, splittings, and line widths from the ones of chloroform and TCE molecules in the gas phase. In conjunction with our simulation results, these differences are rationalized by assuming that, in siliceous FAU, the two sorbates undergo a nondissociative adsorption involving the formation of an Hsorbate⋯Oframework hydrogen bond and Clsorbate⋯Oframework van der Waals interactions, whereas in NaY and NaX, additional Clsorbate⋯Na+ electrostatic interactions are involved. Interestingly, no π/Na+ interaction takes place for TCE. These findings, which are in agreement with previous calorimetric and simulation results, confirm that the strength of the sorbate/zeolite interactions is correlated to the basicity of the zeolite and therefore increases in the sequence siliceous FAU < NaY < NaX, following the sequence of the heats of adsorption.
AB - Molecular information about the nature and the strength of the interactions between chloroform and trichloroethylene (TCE) sorbates and siliceous FAU, NaY, and NaX zeolites was obtained by inelastic neutron scattering (INS) and Raman spectroscopies. The spectral features of the two sorbates differ in terms of their frequencies, splittings, and line widths from the ones of chloroform and TCE molecules in the gas phase. In conjunction with our simulation results, these differences are rationalized by assuming that, in siliceous FAU, the two sorbates undergo a nondissociative adsorption involving the formation of an Hsorbate⋯Oframework hydrogen bond and Clsorbate⋯Oframework van der Waals interactions, whereas in NaY and NaX, additional Clsorbate⋯Na+ electrostatic interactions are involved. Interestingly, no π/Na+ interaction takes place for TCE. These findings, which are in agreement with previous calorimetric and simulation results, confirm that the strength of the sorbate/zeolite interactions is correlated to the basicity of the zeolite and therefore increases in the sequence siliceous FAU < NaY < NaX, following the sequence of the heats of adsorption.
UR - http://www.scopus.com/inward/record.url?scp=0002544049&partnerID=8YFLogxK
U2 - 10.1021/jp991515j
DO - 10.1021/jp991515j
M3 - Article
AN - SCOPUS:0002544049
SN - 1520-6106
VL - 104
SP - 432
EP - 438
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 3
ER -