1[4]Sommer J., Tost R.. Carbenium and Carbonium ions in liquid and solid- suptr acid catalyzed activation of small alkanes. por. Appl Chem., 2000,72(12): 2309~ 2318
2[5]Reddy J.S., Sayari A.. Nanoporous zirlonium oxide prepored using the supra molecular templating ap proach catal. hett. 1996(38):219~ 223