@article {44596,
	title = {Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts},
	journal = {Journal of Nanoscience and Nanotechnology},
	volume = {18},
	year = {2018},
	month = {APR},
	pages = {2986-2992},
	abstract = {<p>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.</p>},
	keywords = {15\% TPA/ZrO2, Cyclohexanol, Cyclohexylation, Keggin TPA, Resorcinol},
	issn = {1533-4880},
	doi = {10.1166/jnn.2018.14342},
	author = {Balasubramanian, V. V. and Devassay, B. M. and Halligudi, S. B. and Deepika, R. and Umbarakar, S. B. and Vinu, A.}
}
