An investigation of the physical structure of MCM-41 novel mesoporous materials using a corrugated pore structure model

Salmas, CE; Stathopoulos, VN; Pomonis, PJ; Rahiala, H; Rosenholm, JB; Androutsopoulos, GP

dc.contributor.author	Salmas, CE	en
dc.contributor.author	Stathopoulos, VN	en
dc.contributor.author	Pomonis, PJ	en
dc.contributor.author	Rahiala, H	en
dc.contributor.author	Rosenholm, JB	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:16:09Z
dc.date.available	2014-03-01T01:16:09Z
dc.date.issued	2001	en
dc.identifier.issn	0926-860X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13942
dc.subject	CPSM model	en
dc.subject	MCM-41	en
dc.subject	Nitrogen sorption	en
dc.subject	Pore structure	en
dc.subject	Tortuosity	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Acidity	en
dc.subject.other	Addition reactions	en
dc.subject.other	Aluminum	en
dc.subject.other	Catalysis	en
dc.subject.other	Mesoporous materials	en
dc.subject.other	Pore size	en
dc.subject.other	Synthesis (chemical)	en
dc.subject.other	Thermodynamic stability	en
dc.subject.other	Titanium	en
dc.subject.other	Corrugated pore structures	en
dc.subject.other	Catalysts	en
dc.title	An investigation of the physical structure of MCM-41 novel mesoporous materials using a corrugated pore structure model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0926-860X(01)00520-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0926-860X(01)00520-8	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The preparation and pore structure characterization of MCM-41 materials with or without Al or Ti addition during synthesis are presented in this work. Such solids are intended for use as catalysts supports possessing advantageous pore structure, total acidity and thermal stability characteristics. BET surface areas up to 1483 m(2)/g were determined and compared with cumulative surface areas obtained by methods like the conventional Roberts' and the newly reported corrugated pore structure model-nitrogen (CPSM-nitrogen) [Ind. Eng. Chem. Res. I 39(2000) 3747; Ind. Eng. Chem. Res. II 39 (2000) 3764]. CPSM predictions are in perfect agreement with estimates obtained by the BET monolayer adsorption variant. Pore size distributions (PSDs) were deduced by using both the Roberts' and the CPSM methods. The superiority of the latter method was confirmed, since apart from the prediction of intrinsic PSDs, enabled the determination of tortuosity factors ranging ca. tau (CPSM) = 1-2.35, for the studied materials [Ind. Eng. Chem. Res. 40 (2000) 721]. These values are lower than those for traditional catalysts ca. tau = 3-10 [Mass Transfer in Heterogeneous Catalysis, 1970, p. 37] and reflect the ordered pore structure of MCM-41 solids. Addition of Al (i.e. Si/Al = 5) caused a PSD shift towards the micropore region (i.e. D-mean shift from 3.28 to 2.10 nm) in contrast to Ti addition (i.e. Si/Ti = 5) that caused a PSD shift farther to the mesopore region (i.e. D-mean shift from 3.28 to 23.74 nm). Lower additions of Al or Ti (i.e. Si/Al = 20 and Si/Ti = 10) caused a pore volume and surface area reduction but not a substantial shift of the intrinsic PSDs. (C) 2001 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Applied Catalysis A: General	en
dc.identifier.doi	10.1016/S0926-860X(01)00520-8	en
dc.identifier.isi	ISI:000169790100004	en
dc.identifier.volume	216	en
dc.identifier.issue	1-2	en
dc.identifier.spage	23	en
dc.identifier.epage	40	en