{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,24]],"date-time":"2025-10-24T16:37:11Z","timestamp":1761323831078,"version":"build-2065373602"},"reference-count":39,"publisher":"Wiley","issue":"26","license":[{"start":{"date-parts":[[2012,7,31]],"date-time":"2012-07-31T00:00:00Z","timestamp":1343692800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Eur J Inorg Chem"],"published-print":{"date-parts":[[2012,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The present work was aimed at performing alkaline desilication of different severities, in order to generate a broad range of mesopore volumes within the framework of the intermediate pore size NU\u201010 zeolite and to evaluate both physicochemical and catalytic consequences. The shape\u2010selective sensitive <jats:italic>o<\/jats:italic>\u2010xylene isomerisation reaction was used as a characterisation method of zeolite pore modification. Thus, several NU\u201010 samples, with preserved crystallinity, were obtained by treatment of a microporous parent NU\u201010 sample with sodium hydroxide solutions of different concentrations (0.4\u20130.6 <jats:sc>M<\/jats:sc>), at several contact times (15, 30, 45, 60 and 120 min) and at 353 K. The characterisation by nitrogen adsorption allowed the evaluation of the micropore volumes of the samples and the mesopore volumes generated by desilication, as well as the external surface area. Toluene adsorption experiments were also performed, an important increase in the toluene adsorption capacity for increasing desilication levels being observed, except for the most severely modified samples. The sample treated at 0.6 <jats:sc>M<\/jats:sc> for 60 min revealed lower toluene retention, probably due to a higher level of extra\u2010framework aluminium and silicon species remaining in the internal porosity. In the case of aluminium species, they were detected by <jats:sup>27<\/jats:sup>Al NMR spectroscopy, which is also in agreement with the pronounced increase in the number of Lewis acid sites detected for the most severely treated samples. A slight decrease in the initial <jats:italic>o<\/jats:italic>\u2010xylene isomerisation activity, at 673 K, was generally noticed as a consequence of desilication, and this can be related to a slight decrease in the concentration of protonated sites. Nevertheless, for intermediate\u2010severity\u2010treated samples, the activity per acid site increased significantly when compared with the parent zeolite, suggesting easier reactant accessibility. Furthermore, the <jats:italic>para<\/jats:italic>\/<jats:italic>meta<\/jats:italic>\u2010xylene product molar ratio decreased and, therefore, the zeolite shape selectivity, thus reinforcing the hypothesis of an extra space generation consequence on the catalytic properties.<\/jats:p>","DOI":"10.1002\/ejic.201200386","type":"journal-article","created":{"date-parts":[[2012,7,31]],"date-time":"2012-07-31T06:39:31Z","timestamp":1343716771000},"page":"4190-4199","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Towards a Deep Desilication\/Dealumination of NU\u201010 Zeolite: Shape\u2010Selectivity Regulation"],"prefix":"10.1002","volume":"2012","author":[{"given":"Clara","family":"S\u00e1 Couto","sequence":"first","affiliation":[]},{"given":"Patr\u00edcia","family":"Matias","sequence":"additional","affiliation":[]},{"given":"Edgar T.","family":"Santos","sequence":"additional","affiliation":[]},{"given":"Auguste","family":"Fernandes","sequence":"additional","affiliation":[]},{"given":"In\u00eas","family":"Gra\u00e7a","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9 M.","family":"Lopes","sequence":"additional","affiliation":[]},{"given":"Maria F.","family":"Ribeiro","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2012,7,31]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"crossref","DOI":"10.1142\/p267","volume-title":"Zeolites for Cleaner Technologies","author":"Guisnet M.","year":"2002"},{"volume-title":"Studies in Surface Science and Catalyis","year":"2007","author":"Maesen T.","key":"e_1_2_6_2_2"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1081\/CR-120023908"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr040204o"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2009.02.039"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/cctc.201000158"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1039\/c1cy00150g"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.cattod.2010.01.059"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2009.05.055"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.micromeso.2004.01.002"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2009.03.006"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.micromeso.2011.08.002"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200903426"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2007.07.020"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.micromeso.2010.01.013"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.micromeso.2006.01.024"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/cm100886y"},{"key":"e_1_2_6_18_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.micromeso.2007.12.025"},{"key":"e_1_2_6_19_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2010.12.013"},{"key":"e_1_2_6_20_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcata.2011.03.049"},{"key":"e_1_2_6_21_2","doi-asserted-by":"publisher","DOI":"10.1039\/c0ce00966k"},{"key":"e_1_2_6_22_2","doi-asserted-by":"publisher","DOI":"10.1039\/c1cy00240f"},{"key":"e_1_2_6_23_2","doi-asserted-by":"publisher","DOI":"10.1038\/312533a0"},{"key":"e_1_2_6_24_2","doi-asserted-by":"publisher","DOI":"10.1016\/0144-2449(87)90115-1"},{"key":"e_1_2_6_25_2","doi-asserted-by":"publisher","DOI":"10.1016\/0144-2449(84)90038-1"},{"key":"e_1_2_6_26_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0166-9834(00)80271-7"},{"key":"e_1_2_6_27_2","doi-asserted-by":"publisher","DOI":"10.1016\/0144-2449(84)90039-3"},{"key":"e_1_2_6_28_2","doi-asserted-by":"publisher","DOI":"10.1021\/jp0264533"},{"key":"e_1_2_6_29_2","doi-asserted-by":"publisher","DOI":"10.1016\/0166-9834(91)80007-J"},{"key":"e_1_2_6_30_2","doi-asserted-by":"publisher","DOI":"10.1006\/jcat.1999.2673"},{"key":"e_1_2_6_31_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19951072218"},{"key":"e_1_2_6_32_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1387-1811(99)00207-3"},{"key":"e_1_2_6_33_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200700967"},{"key":"e_1_2_6_34_2","doi-asserted-by":"publisher","DOI":"10.1135\/cccc20080909"},{"key":"e_1_2_6_35_2","doi-asserted-by":"publisher","DOI":"10.1002\/cite.201000064"},{"key":"e_1_2_6_36_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcat.2006.04.026"},{"key":"e_1_2_6_37_2","doi-asserted-by":"publisher","DOI":"10.1081\/CR-120005741"},{"volume-title":"Adsorption by Powders and Porous Solids","year":"1999","author":"Rouqu\u00e9rol F.","key":"e_1_2_6_38_2"},{"key":"e_1_2_6_39_2","first-page":"1455","volume":"71","author":"Guisnet M.","year":"1997","journal-title":"Pol. 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