Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts
Title | Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts |
Publication Type | Journal Article |
Year of Publication | 2018 |
Authors | Balasubramanian, VV, Devassay, BM, Halligudi, SB, Deepika, R, Umbarakar, SB, Vinu, A |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 18 |
Issue | 4 |
Pagination | 2986-2992 |
Date Published | APR |
ISSN | 1533-4880 |
Keywords | 15% TPA/ZrO2, Cyclohexanol, Cyclohexylation, Keggin TPA, Resorcinol |
Abstract | We demonstrate a highly active and reusable heterogeneous catalyst system, tungstophosphoric acid (TPA) supported on zirconia (ZrO2), for the cyclohexylation of resorcinol by cyclohexanol to produce value added chemicals such as 2-cyclohexyl resorcinol, 4-cyclohexyl resorcinol and 3-Hydroxy cyclohexyl phenyl ether under liquid phase reaction condition. TPA/ZrO2 catalysts prepared with different TPA loadings (5-30 wt.%) by wet impregnation method and calcined in the temperature range of 650-850 degrees C were characterized by Nitrogen sorption analysis, XRD, FTIR, DTG and DTA, and P-31 MAS NMR spectroscopy. Among the catalysts studied, 15 wt.% TPA/ZrO2 catalyst calcined at 750 degrees C gave the highest conversion of resorcinol (51.2%) with the selectivities for 3-Hydroxy cyclohexyl phenyl ether (53.9%) and 2-cyclohexyl resorcinol and 4-cyclohexyl resorcinol together (46.1%) under optimum reaction conditions. However, the selectivity of the products were controlled by varying the reaction conditions. At higher conversion of resorcinol (78.9%), only C-alkylated products were formed at 200 degrees C with 15 wt.% TPA/ZrO2 catalyst calcined at 750 degrees C. The combination of TPA and ZrO2 coupled with calcination temperature offered an excellent platform for the conversion of resorcinol into O- or C-alkylated products. |
DOI | 10.1166/jnn.2018.14342 |
Type of Journal (Indian or Foreign) | Foreign |
Impact Factor (IF) | 1.483 |
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