@article { ISI:000241320000002,
	title = {Nature and mode of addition of phosphate precursor in the synthesis of aluminum phosphate and its influence on methanol dehydration to dimethyl ether},
	journal = {Catalysis Communications},
	volume = {7},
	number = {10},
	year = {2006},
	month = {OCT},
	pages = {745-751},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Four aluminum phosphate catalysts with Al/P = 1 were prepared by precipitation of mixture of aluminum nitrate and phosphate precursor (either phosphoric acid or diammonium hydrogen phosphate) with NH3 and precipitation of aluminum nitrate with NH3 followed by impregnation of phosphate precursor (either phosphoric acid or diammonium hydrogen phosphate). The catalysts were characterized, using different physico-chemical methods viz., BET-S.A., XRD, FT-IR, and NH3-TPD. Al-27 and P-31 MAS NMR spectroscopy was used to characterize selected catalysts in order to find out the presence of Al and P environments. The catalytic conversion of methanol to dimethyl ether was conducted over these catalysts in a temperature range of 448-548 K at atmospheric pressure. AIPO(4) prepared by precipitating the mixture of aluminum nitrate and (NH4)(2)HPO4 with aq. NH3 generated more number of moderate acid sites and showed higher methanol dehydration activity with 100\% selectivity to DME at 548 K. (c) 2006 Elsevier B.V. All rights reserved.</p>},
	keywords = {Al-27 and P-31 MAS NMR, aluminum phosphate, dehydration, dimethyl ether, Methanol, NH3-TPD},
	issn = {1566-7367},
	doi = {10.1016/j.catcom.2006.02.025},
	author = {Kumar, V. Siva and Padmasri, A. H. and Satyanarayana, C. V. V. and Reddy, I. Ajit Kumar and Raju, B. David and Rao, K. S. Rama}
}
@article { ISI:000317945100020,
	title = {Metal cation-exchanged montmorillonite clay as catalysts for hydroxyalkylation reaction},
	journal = {Applied Clay Science},
	volume = {74},
	number = {SI},
	year = {2013},
	month = {APR},
	pages = {141-146},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Several solid acid catalysts were prepared by exchanging metal cations such as Zn2+, Fe3+ and Al3+ with montmorillonite clay. Among these, Al-montmorillonite showed the highest acidity determined by the pyridine-IR as well as NH3-TPD methods. A systematic comparison of the performance of these catalysts along with parent montmorillonite was carried out for the hydroxyalkylation of p-cresol with formaldehyde to give 2, 2{\textquoteright}-methylenebis (4-methyl phenol) (DAM). It was found that the activity of these catalysts was in accordance with the increase in acidity of parent montmorillonite after the exchange of cations in the order of Zn2+, Fe3+ and Al3+. The selectivity pattern was also influenced by the exchanged cations. Since Al-montmorillonite showed the highest conversion of 51\% with 98\% selectivity to DAM, the effects of various reaction parameters, namely, mole ratio, catalyst concentration, temperature, reaction time on conversion and selectivity pattern were also studied using the same catalyst This catalyst also showed an excellent stability as evidenced by its eight times reuse. (C) 2012 Published by Elsevier B.V.</p>},
	keywords = {Cations-exchanged clay, Montmorillonite, NH3-TPD, Pyridine-IR},
	issn = {0169-1317},
	doi = {10.1016/j.clay.2012.10.005},
	author = {Jha, Ajay and Garade, Ajit C. and Shirai, M. and Rode, C. V.}
}
