Fresh and calcined supported 12-tungstosilicicacid: Synthesis, characterization and application to some acid catalyzed reactions

A series of catalyst containing 20–70% of 12-tungstosilicicacid (TSA) supported onto neutral alumina (A) has been synthesized, characterized and evaluated for esterification of 1° and 2° alcohols. The best catalyst, TSA3/A (30% loading of 12-tungstosilicicacid onto neutral alumina) has been compared with TSA3/Z (30% loading of 12-tungstosilicicacid onto hydrous zirconia) in order to see the effect of nature of support. The catalytic activity of TSA3/A and TSA3/Z has also been explored for tert-butylation of phenol by varying different parameters. Both the catalysts were calcined in the temperature range of 300–500 °C and characterized by FT-IR, DRS and XRD to see the structural change in the calcined materials. Their catalytic activity was also evaluated for the esterification as well as tert-butylation of phenol under optimized conditions. An attempt has also been made to regenerate and to reuse the present catalysts, especially for tert-butylation of phenol.

12-Tungstosilicicacid (TSA) supported onto neutral alumina has been synthesized and characterized by various physicochemical techniques and used as solid acid catalyst for carrying out acid catalyzed reactions. The results were compared with 12-tungstosilicicacid supported onto hydrous zirconia in order to see the effect of nature of support.Figure optionsDownload as PowerPoint slide