The characterization results of acidity measurement and IR and UV-Vis spectroscopy indicate that the deactivation is probably due to the leaching of sulfonic group from the surface of the catalyst.

• 详细考察了反应温度和溶剂对催化剂稳定性的影响，结果表明，该固体酸在低温的水相或非极性溶剂中较为稳定。