Synthesis and characterization of Ta-pillared ilerite

Abstract

A new porous material, Ta-pillared ilerite is derived by pillaring tantalum oxide into silicic acid of ilerite. The new material was characterized through solid state 29Si NMR, IR, X-ray, TGA, UV-VIS, TPD and BET measurements. Upon pillaring of tantalum oxide, the basal spacing of ilerite is expanded to 37 A, and pillared structure of the ilerite is preserved even after calcination at 700°C. The BET surface areas of the Ta-pillared ilerite after complete elimination of the surfactant are ranged between 378 m2/g and 400 m2/g. From the NH3-TPD profile of Ta-pillared ilerite, it is shown that the new material contains large number of acid sites of intermediate acidity. ？ 2000 Elsevier Science B.V. All rights reserved.