01904nas a2200265   4500008004100000022001400041245012400055210006900179260007300248300001200321490000700333520090600340653001901246653005301265653002201318653001701340653003801357100002101395700002301416700001701439700002501456700001801481700001701499856012201516       2010                        eng d  a0169-131700aAcidity tuning of montmorillonite K10 by impregnation with dodecatungstophosphoric acid and hydroxyalkylation of phenol0 aAcidity tuning of montmorillonite K10 by impregnation with dodec  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a164-1700 v483 a<p>Acidity tuning of montmorillonite K10 (mont K10) was achieved by impregnating with dodecatungstophosphoric acid (DTP). The effect on the hydroxyalkylation of phenol was studied at 353 K with phenol to formaldehyde molar ratio of 5. The nature and strength of acid sites were determined by NH(3)-TPD measurement while the distribution of Brensted and Lewis acid sites expressed as B/L ratio, was determined by pyridine IR technique. Among various loadings of DTP (5-60%) studied for the hydroxyalkylation of phenol, 20% DTP/mont K10 showed the highest catalyst activity (90% selectivity to bisphenol F with 28% conversion of phenol). Both total concentration of acid sites and the distribution of acid sites in a high temperature region were required for the high bisphenol F selectivity. Our catalyst (20% DTP/Mont K10) could be recycled three times. (C) 2009 Elsevier B.V. All rights reserved.</p>10aAcidity tuning10aDodecatungstophosphoric acid/Montmorillonite K1010aHydroxyalkylation10aImpregnation10aTemperature programmed desorption1 aGarade, Ajit, C.1 aKshirsagar, V., S.1 aMane, R., B.1 aGhalwadkar, Ajay, A.1 aJoshi, U., D.1 aRode, C., V.  uhttps://library.ncl.res.in/content/acidity-tuning-montmorillonite-k10-impregnation-dodecatungstophosphoric-acid-and-0