Nanocomposite MFI-alumina membranes via pore-plugging synthesis: Specific transport and separation properties

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO2Capture

“…Although the methodology here proposed is far from being optimized, this new nanocomposite FAU membrane offers a good compromise between permeance and selectivity in the separation of CO 2 /N 2 equimolar mixtures. The reproducibility of this FAU membrane synthesis has not been studied in this work, but is probably better than in the preparation of film-like membranes, as already reported for MFI membranes [15][16][17][18][19][20][21][22]. Further development in the near future will focus on the reduction of useless zeolite in larger pores by impregnating and wrapping the tubes during the synthesis, and on the minimization of intercrystalline defects by optimizing the growth conditions.…”

“…In addition to film-like zeolite membranes, nanocomposite MFI-alumina architectures (prepared either as tubes or hollow fibres) have shown high potential to improve membrane reproducibility and the gas permeation and separation performance [15][16][17][18][19][20][21][22]. In this architecture, in contrast to a film, the active phase is embedded into the host ceramic alumina porous network via pore-plugging in situ hydrothermal synthesis (without seeding).…”

“…This property makes nanocomposite membranes the materials of choice when large surface areas are involved. Another consequence is that mass transfer within these membranes at high temperature (> 400 K) is kept governed by zeolite pores instead of intercrystalline openings that may appear in film-like configurations, allowing selectivity by molecular-sieving at high temperatures [15,[22][23][24].…”

Inorganic microporous membranes for H2 and CO2 separation—Review of experimental and modeling progress

“…Nevertheless, the studies on nanocomposite MFI-alumina membranes reveal a monotonic decrease of flux with the increase of temperature, which can be explained by pure surface diffusion without an additional "activated diffusion" mechanism (Miachon et al, 2007;Ciavarella et al, 2000). The authors attribute the flux increase in film-like zeolite membranes to the reversible opening of intercrystalline pathways upon heating, based on their investigation through a simple geometric model.…”

Modelling and sensitivity analysis of a nanocomposite MFI-alumina based extractor-type zeolite catalytic membrane reactor for m-Xylene isomerization over Pt-HZSM-5 catalyst

“…The membrane used in this study was prepared by poreplugging synthesis technique [17][18][19]. The cross-sectional layers of the support have dimensions: outer layer, 12 m; intermediate layer, 0.8 m; inner layer, 0.2 m. The nanocomposite nature of the membranes was inspected by SEM (JSM-5800LV, 20 kV) coupled with EDX analysis (Edax Phoenix, 1-m microprobe).…”