Title
Demonstrating the benefits and pitfalls of various acidity characterisation techniques by a case study on bimodal aluminosilicates
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Washington, D.C. ,
Subject
Physics
Chemistry
Source (journal)
Langmuir: the ACS journal of surfaces and colloids. - Washington, D.C.
Volume/pages
30(2014) :7 , p. 1880-1887
ISSN
0743-7463
ISI
000332059500019
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A new combination of a volumetric with a dynamic method to investigate the acidity properties of aluminosilicates is introduced. In a first step, the total acidity is determined volumetrically by the measurement of two-cycle adsorption (TCA) isotherms with ammonia as probe, directly followed by a dynamic temperature programmed desorption (TPD) experiment to define the acid strength distribution. Furthermore, the results obtained by the new direct combination of TCA and TPD are validated by a comparison with an in-situ FT-IR (Fourier transform infrared) study with the same probe molecule on the same materials. Both acidity characterisation techniques are compared and commented on their complementarity, benefits and pitfalls. The material under investigation is a new type of bimodal micro- and mesoporous material with zeolitic characteristics, synthesised by a mesotemplate-free method. The acidic nature of the novel material is set in comparison to two reference materials, being a crystalline zeolite and a mesoporous aluminium incorporated mesocellular foam (Al-MCF) with amorphous characteristics.
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