@article { ISI:000276010700025,
	title = {Acidity tuning of montmorillonite K10 by impregnation with dodecatungstophosphoric acid and hydroxyalkylation of phenol},
	journal = {Applied Clay Science},
	volume = {48},
	number = {1-2, SI},
	year = {2010},
	month = {MAR},
	pages = {164-170},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<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>},
	keywords = {Acidity tuning, Dodecatungstophosphoric acid/Montmorillonite K10, Hydroxyalkylation, Impregnation, Temperature programmed desorption},
	issn = {0169-1317},
	doi = {10.1016/j.clay.2009.11.042},
	author = {Garade, Ajit C. and Kshirsagar, V. S. and Mane, R. B. and Ghalwadkar, Ajay A. and Joshi, U. D. and Rode, C. V.}
}
