Pore structure-chemical composition interactions of new high surface area manganese based mesoporous materials. Materials preparation, characterization, and catalytic activity

Salmas, CE; Stathopoulos, VN; Pomonis, PJ; Androutsopoulos, GP

dc.contributor.author	Salmas, CE	en
dc.contributor.author	Stathopoulos, VN	en
dc.contributor.author	Pomonis, PJ	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:18:13Z
dc.date.available	2014-03-01T01:18:13Z
dc.date.issued	2002	en
dc.identifier.issn	0743-7463	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14875
dc.subject	Catalytic Activity	en
dc.subject	Chemical Composition	en
dc.subject	mesoporous material	en
dc.subject	Pore Structure	en
dc.subject	Surface Area	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	Catalyst activity	en
dc.subject.other	Characterization	en
dc.subject.other	Complexation	en
dc.subject.other	Composition	en
dc.subject.other	Manganese	en
dc.subject.other	Pore size	en
dc.subject.other	Redox reactions	en
dc.subject.other	Pore structures	en
dc.subject.other	Mesoporous materials	en
dc.title	Pore structure-chemical composition interactions of new high surface area manganese based mesoporous materials. Materials preparation, characterization, and catalytic activity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/la010340d	en
heal.identifier.secondary	http://dx.doi.org/10.1021/la010340d	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The present article deals with pore structure-chemical composition interactions of new high surface area manganese based porous mixed oxides (MANPOs). These mixed oxidic materials were prepared by the dropwise addition of a solution containing metal nitrate into an acetonic solution containing the trinuclear complex of manganese [Mn3O(CH3COO)(6)(pyr)(3)] ClO4, which is water sensitive. The CPSM model (corrugated pore structure model) was employed in pore structure investigations of the MANPO materials containing Al, Fe, La, La + Ce, and La + Sr. Successful CPSM simulations of nitrogen sorption hysteresis loops for the MANPO solids enabled the evaluation of intrinsic pore size distributions (PSDs) and tortuosity factors. The latter vary over the approximate range tau(CPSM) approximate to 3.0-5.7 (i.e. tau(CPSM) 3 for materials containing Al or Fe and tau(CPSM) = 4.7-5.7 for those containing La, La + Ce, or La + Sr). These values are typical of porous catalysts and are higher than those reported for MCM-41 materials (ca. tau(CPSM) = 1.00-2.35) and anodic aluminum oxide films (e.g. tau(CPSM) = 2.60). The BET surface areas of the MANPO materials vary over the approximate range 180-900 m(2)/g, being higher than those reported for manganese oxide mesopore solids (MOMS), for example 59-170 m(2)/g. Intrinsic PSD predictions for the MANPO solids are of bimodal type with mean pore sizes systematically higher than the respective :mean hydraulic diameters. The addition of Fe and La + Ce caused a PSD shift toward the micropore region. Such MANPO materials are amorphous after heating to 500 C (except for the ones containing Fe) and extremely efficient catalysts for redox reactions such as lean de-NO,, applications and NO-CO conversion, probably because of the extremely high dispersion of separate nanophases into the solid.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Langmuir	en
dc.identifier.doi	10.1021/la010340d	en
dc.identifier.isi	ISI:000173423700017	en
dc.identifier.volume	18	en
dc.identifier.issue	2	en
dc.identifier.spage	423	en
dc.identifier.epage	432	en