Abstract
The deposition of a NaA zeolite layer on porous stainless steel substrates was optimized in order to obtain composite membranes for hydrogen separation. The effect of the silica source on NaA zeolite crystallinity and morphology was studied using two synthesis routes: concentrated gel and clear solution. The optimized synthesis conditions were applied for the synthesis of NaA zeolite layers on top of porous stainless steel disks or on the outer surface of tubular supports. SEM and XRD measurements confirmed that the use of rice husk allowed obtaining defect free and pure phase NaA zeolite membranes. Selectivity values similar to those published for NaA zeolite membranes based on ceramic substrates were obtained using zeolite layers deposited on porous stainless steel tubes. From the curve fitting of the experimental data, the contribution of zeolitic and non-zeolitic flux was estimated. For the membranes synthesized from a concentrated gel, H2 showed a predominated contribution of the zeolitic flux.
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Abbreviations
- \(A\) :
-
Model parameter (mol m2 s)
- \(A_{t}\) :
-
Total area of the membrane (m2)
- \(A_{z}\) :
-
Zeolite open pore area (m2)
- \(B\) :
-
Model parameter [(mol K J−1)0.5]
- \(b_{i}\) :
-
Langmuir adsorption constant of component i (Pa−1)
- \(b_{i,0}\) :
-
Langmuir adsorption constant of component i at reference temperature (Pa−1)
- \(C\) :
-
Model parameter (mol K m J−1)
- \(D_{i,0}\) :
-
Diffusivity of component i at zero loading (m2 s−1)
- \(E_{i}^{D}\) :
-
Activation energy of component i (J mol−1)
- \(M\) :
-
Molecular weight (g mol−1)
- \(N_{i,k}\) :
-
Knudsen flux (mol m−2 s−1)
- \(N_{i,t}\) :
-
Total flux through the membrane (mol m−2 s−1)
- \(N_{i,v}\) :
-
Viscous flux (mol m−2 s−1)
- \(N_{i,z}\) :
-
Molar flux of component i through zeolite pores (mol m−2 s−1)
- \(P\) :
-
Pressure (Pa)
- \(P_{i}\) :
-
Partial pressure of component i (Pa)
- \(P_{m}\) :
-
Mean pressure (Pa)
- \(q_{s}\) :
-
Saturation adsorption capacity (mol kg−1)
- \(R\) :
-
Ideal gas constant (J mol−1 K−1)
- \(r_{i}\) :
-
Defect size (m)
- \(T\) :
-
Temperature (K)
- \(T_{0}\) :
-
Reference temperature (K)
- \(\alpha_{i/j}\) :
-
Ideal separation factor
- \(\Delta H_{i}\) :
-
Enthalpy of adsorption of component (J mol−1)
- \(\Delta X\) :
-
Thickness of zeolite film (m)
- \(\nu\) :
-
Viscosity (Pa s)
- \(\varPi_{i}\) :
-
Permeance of component i (mol m−2 s−1 Pa−1)
- \(\varPi_{j}\) :
-
Permeance of component j (mol m−2 s−1 a−1)
- \(\rho\) :
-
Zeolite density (kg m−3)
- \(\tau\) :
-
Membrane tortuosity
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Acknowledgements
The authors wish to acknowledge the financial support received from Universidad Nacional del Litoral, CONICET and ANPCyT. Thanks are also given to Betina Faroldi and Luis Salazar Hoyos for providing the silica obtained from rice husk.
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Martinez Galeano, Y., Tarditi, A.M. & Cornaglia, L.M. NaA zeolite membranes on modified porous stainless steel supports: a comparative study of different SiO2 sources. Braz. J. Chem. Eng. 37, 383–397 (2020). https://doi.org/10.1007/s43153-020-00024-y
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DOI: https://doi.org/10.1007/s43153-020-00024-y