Fig. 6.Solketal yield vs. time-on-stream with catalysts of Amberlyst Wet (a),
Zeolite (b), Amberlyst Dry (c), Zirconium sulfate (d), Montmorillonite (e) and
Polymax (f)
Fig. 7.FTIR spectra of the fresh and spent Amberlyst Wet (experimental conditions:
40C, 600 psi and WHSV of 4 h
1
with acetone equivalent of 2).