An acid-functionalized ionic liquid was entrapped within a silica gel to yield a recyclable liquid phase catalyst for the dehydration of rac-1-phenyl ethanol. Hot filtration tests showed that the activity was within the gel. Comparison with an analogous SILP system revealed fundamental differences in the properties and behavior of the materials.
Wang, Y., Ulrich, V., Donnelly, G. F., Lorenzini, F., Marr, A. C., & Marr, P. C. (2015). A Recyclable Acidic Ionic Liquid Gel Catalyst for Dehydration: Comparison with an Analogous SILP Catalyst. ACS Sustainable Chemistry & Engineering, 3(5), 792-796. https://doi.org/10.1021/sc5008303