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@PHDTHESIS{Maaz:788066,
author = {Maaz, Swaantje},
othercontributors = {Palkovits, Regina and Rose, Marcus},
title = {{S}ystematische {U}ntersuchung des {E}influsses von
{A}luminiumdichte und {S}truktureigenschaften auf das
{W}assersorptionsverhalten von {Z}eolithen},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
reportid = {RWTH-2020-04415},
pages = {1 Online-Ressource (IV, 85 Seiten) : Illustrationen,
Diagramme},
year = {2020},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 2020},
abstract = {Thermally operated heat pumps may play an important role in
the usage of waste heat. Their efficiency can be influenced
among other things by modifying the structural and chemical
properties of the adsorbent. The focus of this thesis is the
influence of Aluminum density and other structural
properties, e.g. specific surface area, pore volume and
proportion of micro-/mesopores, on the behavior of zeolites
in water vapor sorption. A holistic approach is necessary to
put the correlations in perspective, to be able to establish
a structure-property-correlation and to use that knowledge
to tailor adsorbents for any application. Commercially
available zeolites of different framework types were
thoroughly analyzed using nitrogen physisorption and water
physisorption. The influence of the counterion in the
framework was discussed in a type FAU zeolite (Li+, Na+,
NH4+, H+). Furthermore, several hierarchical zeolites of
type LTA and MFI were used to investigate the influence of
meso- and macropores on the water sorption behavior. The
water sorption isotherms were also qualitatively evaluated
concerning the course of the isotherm. In addition, the pore
filling degree at low and high relative pressure was
calculated which showed a deviating water sorption behavior
for different framework types with the same Aluminum
density. Across all investigated areas the influence of the
structural properties was significant. All in all, it was
obvious that the adsorption of water on zeolite is complex
and highly influenced by the material properties. Hence, a
simple consideration of the sorption capacity (loading at
high relative pressure), as often seen in literature, is not
enough to determine the qualification of a zeolite as an
adsorbent in an adsorption heat pump.},
cin = {155310 / 150000},
ddc = {540},
cid = {$I:(DE-82)155310_20140620$ / $I:(DE-82)150000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2020-04415},
url = {https://publications.rwth-aachen.de/record/788066},
}
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