02031nas a2200217   4500008004100000022001400041245006700055210006400122260007300186300001000259490000800269520130600277653001301583653002001596653001901616653001301635100001501648700002201663700002801685856010001713       2005                        eng d  a1381-116900atert-Butylation of p-cresol over WOx/ZrO2 solid acid catalysts0 atertButylation of pcresol over WOxZrO2 solid acid catalysts  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL  a44-510 v2353 a<p>The tert-butylation of p-cresol with tert-butanol was carried out over WO3/ZrO2 catalysts under flow conditions, The catalysts were prepared by wet impregnation method using zirconium oxyhydroxide and ammonium metatungstate. Catalysts with different WO3 loading (5-30 wt.%) were prepared and calcined at 800 degrees C and catalyst with 15% WO,, was calcined from 600 to 900 C. The catalysts were characterized by surface area, XRD, FTIR and TEM. The catalyst 15% WO3/ZrO2 calcined at 800 degrees C found to be the most active in the reaction. The effect of temperature, space velocity and molar ratio of the reactants on the conversion of p-cresol and products selectivities were studied. Under the optimized reaction conditions of 130 degrees C, tert-butanol/p-cresol molar ratio of 3 and flow rate of 10 ml h(-1). p-cresol conversion was 69.8% with selectivity to 2-tert-butyl-p-cresol 92.4%, 2,6-di-tert-butyl-p-cresol 6.3% and p-cresol tert-butyl ether 1.3%. The catalytic activity is compared with sulfated zirconia, USY, H beta zeolites and montmorillonite K-10 under the optimized reaction conditions The activity of sulfated zirconia is lower than that of 15% WO3/ZrO2 catalyst calcined at 800 C and other catalysts showed very low activity, (c) 2005 Elsevier B.V.. All rights reserved.</p>10ap-Cresol10atert-butylation10atungsten oxide10aZirconia1 aSarish, S.1 aDevassy, Biju, M.1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/tert-butylation-p-cresol-over-woxzro2-solid-acid-catalysts-0