Synthesis and characterization of MCM-48 tubular membranes

Synthesis of stable Ti-containing mesoporous tubular membrane using silicalite-1 nanoparticles as seeds

“…Table 3 compares the permeance results in previous publications and this work. As can be seen, the mesoporous membrane in this work exhibited higher permeances and H 2 /N 2 ideal selectivities compared to other mesoporous membranes [24][25][26][27].…”

“…However, the synthesis of inherently hydrothermal stable mesoporous membrane was scarcely probed [24]. On the other hand, compared to the hotly used or studied MCM-41 and MCM-48 membranes [24][25][26][27][28][29][30], mesoporous Ti-containing zeolite membrane has been received less attention despite the fact that Ti-MCM-41 was reported early in 1994 and has been extensively studied [5][6][7]31]. In addition to the separation, Ti-containing mesoporous membrane would find their niche in composite membrane reactors, catalytic membrane reactors and microreactors just like the microporous zeolite membranes with full application opportunities in the mentioned areas [32][33][34][35][36][37][38][39].…”

“…In such a case, the support properties have significant influences on the quality of the synthesized mesoporous membranes. Iglesia and co-workers [25] has investigated the effects of tubular supports with different pore sizes on mesoporous membrane and concluded that the best pore size of support for preparation of compact MCM-48 membrane was 60 nm or lower. The effect of support chemistry was also observed in microporous zeolite membrane synthesis, but pre-seeding the support could significantly reduce the effects on zeolite deposition and growth [14,40].…”

Mesoporous Si-MCM-48 membrane prepared by pore-filling method

“…The results showed that permeation of these gases through the MCM-48 membrane was governed by Knudsen diffusion mechanism. Some studies reported the MCM-48 membrane prepared on the supports with various pore sizes and concluded that the pore size of the support played an important role on membrane quality [7][8][9]. The highest quality membranes without defects and cracks were prepared on the supports with pore size ranging from 5 nm to 200 nm.…”

“…Kim et al [11], using a thermal decomposition treatment during calcination, removed the filler PVA after the silica thin film. In the process of high-temperature calcination, it not only affected the lattice structure of MCM-48 molecular sieve [8,9,14], but also caused membrane surface cracking due to the different coefficients of thermal expansion between support and film layer.…”