Adsorption of ethanoic acid on zeolites NaY and HY
The enthalpy and entropy of adsorption of ethanoic acid by the zeolite HY do not appear to be strongly influenced by the geometric constraints of the pore system. These results, which were predicted previously, contrast with those on H-ZSM-5. A companion examination of adsorption by NaY was complicated by chemical reactions which produced small amounts of ethanoate ions, water, ethanoic anhydride and methane. These products were not observed on HY. The intensity of FTIR absorption bands in the frequency range 1850–1250 cm–1, which resulted from adsorption of ethanoic acid on NaY, depended strongly on adsorbed molecule concentration and were time dependent. Spectra were simpler, and less intense at the same surface concentration on HY.