%0 Journal Article
%A Selzer, Carolin
%A Werner, Anja
%A Kaskel, Stefan
%D 2018
%T Selective Adsorption of Propene over Propane on Hierarchical
Zeolite ZSM-58
%U https://acs.figshare.com/articles/journal_contribution/Selective_Adsorption_of_Propene_over_Propane_on_Hierarchical_Zeolite_ZSM-58/6223487
%R 10.1021/acs.iecr.8b00377.s001
%2 https://acs.figshare.com/ndownloader/files/11323487
%K zeolite ZSM -58
%K propene adsorption isotherms
%K synthesis gel results
%K ZSM -58 materials exhibit
%K bottom-up synthesis method
%K Resulting ZSM -58 samples
%K breakthrough experiments
%K X-ray powder diffraction
%K propane adsorption
%K gas separation processes
%K mesopore volume
%K scanning electron microscopy
%K Hierarchical Zeolite ZSM -58 Hierarchical zeolite ZSM -58
%K ZSM -58 samples
%K CNT
%X Hierarchical
zeolite ZSM-58 was synthesized via a bottom-up synthesis
method using varying amounts of carbon nanotubes (CNTs) as mesopore-generating
template. Resulting ZSM-58 samples were analyzed by X-ray powder diffraction,
scanning electron microscopy and physisorption experiments with argon,
propane and propene. The adsorption of a binary propane/propene mixture
was determined by breakthrough experiments. Furthermore, thermal response
measurements using InfraSORP technology were applied to investigate
the kinetics of propene adsorption on microporous vs hierarchical
ZSM-58 samples. The use of up to 5 wt % CNTs as secondary template
in the synthesis gel results in formation of zeolite ZSM-58 with mesopore
volumes up to 0.06 cm3 g–1, while maintaining
a high degree of crystallinity as demonstrated via X-ray powder diffraction.
A direct correlation between the relative mesopore volume (Vmeso/Vtotal) and
the mass fraction of CNTs applied during zeolite synthesis was found.
The enhanced adsorption rates of hierarchical zeolite materials are
evidenced by InfraSORP measurements with propene. Microporous and
hierarchical ZSM-58 materials exhibit comparable propene adsorption
isotherms at 298 K, demonstrating that the additional mesoporosity
does not affect their capacity for propene. However, it promotes propane
adsorption, as attributed to the higher propane capacity observed
for hierarchical ZSM-58 samples with higher mesopore volume. Nevertheless,
a total separation of propane/propene mixtures could be achieved for
all microporous and hierarchical materials due to kinetic hindrance
of propane adsorption, as confirmed by breakthrough experiments. The
highly variable synthesis method allows preparation of hierarchical
ZSM-58 with tailored adsorption properties. Therefore, these materials
are promising candidates for industrial gas separation processes.
%I ACS Publications