Phosphotungstic acid promoted zirconia-alumina mixed oxides: A stable and reusable catalysts for epoxidation of trans-stilbene

作者：Parida K M^*; Mallick Sujata

来源：Catalysis Communications, 2009, 11(1): 51-57.

DOI：10.1016/j.catcom.2009.07.002

• Zirconia-alumina
• Phosphotungstic acid
• Epoxidation
• trans-Stilbene

Zirconia-alumina mixed oxide supported phosphotungstic acid catalysts were synthesized and characterized by various techniques. The surface-and bulk properties of the catalysts were examined by Xray diffraction, BET surface area, ammonia-TPD, TPR, P-31 MAS NMR and FTIR techniques. The prepared catalysts were evaluated for liquid phase epoxidation of trans-stilbene using tert-butylhydroperoxide as an oxidant. Among all the promoted catalyst, 25 wt.% phosphotungstic acid impregnated zirconia-alumina mixed oxide showed 46% conversion and 89% of selectivity towards trans-stilbene oxide formation.

• 出版日期2009-10-10