Synthesis and Granulation of a 5A Zeolite-Based Molecular Sieve and
Adsorption Equilibrium of the Oxidative Coupling of Methane Gases
Posted on 2017-03-30 - 15:21
This work presents
a detailed description of the synthesis of a 5A zeolite and its further
granulation into molecular sieve beads. The XRD spectrum of synthesized
crystals showed the characteristic peaks of a type A sodium zeolite,
and XRF results of the ion-exchanged material with a calcium chloride
solution allowed us to verify the formation of a 5A zeolite structure.
The analysis of SEM images indicated that the granulated process generated
a core–shell structure with suitable mechanical properties
for industrial use. The granulated material exhibited similar properties
(roundness, 96%; crush strength, 57 N; packing density, 607 kg/m3; and Langmuir surface area, 410.5 m2/g) to most
commercial molecular sieves. However, its lower water sorption capacity
(0.142 kg/kg) reveals that zeolite adsorption is affected by the cementing
material. Adsorption equilibrium studies at different temperatures
with oxidative coupling of methane (OCM) effluent gases indicated
that the material showed a higher affinity for CO2, followed
by ethylene, ethane, and methane, whereas nitrogen was barely retained.
The affinity trend was in agreement with the observed heats of adsorption,
which were in the range of 13–30 kJ/mol for tested gases. Isotherms
were fitted with a Langmuir model, and adsorption parameters were
obtained. Regressed equilibrium equations can be used for further
modeling of a swing adsorption separation for OCM effluent gases.
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Garcı́a, Leonel; Poveda, Yuly A.; Khadivi, Mohammadali; Rodríguez, Gerardo; Görke, Oliver; Esche, Erik; et al. (2017). Synthesis and Granulation of a 5A Zeolite-Based Molecular Sieve and
Adsorption Equilibrium of the Oxidative Coupling of Methane Gases. ACS Publications. Collection. https://doi.org/10.1021/acs.jced.7b00061
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AUTHORS (9)
LG
Leonel Garcı́a
YP
Yuly A. Poveda
MK
Mohammadali Khadivi
GR
Gerardo Rodríguez
OG
Oliver Görke
EE
Erik Esche
HG
Hamid Reza Godini
GW
Günter Wozny
AO
Alvaro Orjuela
KEYWORDS
Adsorption equilibrium studiesXRF resultsLangmuir modelZeolite-Based Molecular SieveLangmuir surface areaSEM imagescalcium chloride solutionXRD spectrumion-exchanged materialzeolite structuregranulated materialMethane Gaseszeolite adsorptionCO 2adsorption parameters57 NRegressed equilibrium equationseffluent gasesswing adsorption separationsodium zeoliteOCM effluent gasesgranulated processaffinity trendkgAdsorption Equilibriumsieve beads