Fabrication of Pebax/SAPO mixed matrix membranes for CO₂/N₂ separation

Abstract

Mixed matrix membranes (MMMs) were prepared by solvent evaporation method using Pebax‐1074 polymer as matrix and inorganic zeolite SAPO‐23 as dopant. The morphology, surface functional groups, microstructure, thermal stability, and separation performance of MMMs were analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy, X‐ray diffraction, thermogravimetric analysis, and gas permeation, respectively. The effects of dopant loading amount, permeation temperature, and permeation pressure on the structure and properties of MMMs were investigated. The results showed that the introduction of SAPO zeolite reduced the crystallinity of the MMMs and improved the CO2/N2 selectivity. Under the conditions of 30°C and 0.15 MPa, the MMMs prepared by incorporating with 5% SAPO zeolite in content exhibited the highest CO2/N2 selectivity of 72.0 together with the CO2 permeability of 98.2 Barrer.

Mixed Matrix Membranes Based on Nanoparticle, Nanorod, and Nanosheet MFI-Type Zeolites for Gas Separation

“…The peak positions of MMMs are shown in Table . From Figure d–f, it can be seen that bands at 2923 and 1473 cm –1 are due to C–H symmetric stretching and CC symmetric stretching, which demonstrate the successful transformation of matter . The band around 1100 cm –1 shows the presence of Si–O–Si.…”

Direct evidence of time-dependent crystallization evolution of SAPO-34 and SAPO-20 zeolites directed by trimethylbenzylammonium hydroxide for microwave-assisted ethanolysis of furfuryl alcohol

“…19 Meanwhile, other SAPO zeolites, such as SAPO-20 (SOD topology), are small pore zeolites with a pore opening of 2.53 Â 2.53 Å 2 , which are useful in selective removal of nitrogen oxides from exhaust gases, and separation of hydrogen gas from gas mixtures. 20,21 Typically, SAPO-34 can be synthesized using diethylamine, 22 triethylamine, 23 tetraethylammonium hydroxide, 24 1-propylpyridinium hydroxide, 25 piperidine 26 or morpholine 27 as organic templates, whereas SAPO-20 can only be crystallized using trimethylamine. 28 These organic templates show different shapes, hydrophilicity and sizes, and thus demonstrate different crystallization kinetics and structure-directing ability for tailoring the pore structure of zeolites.…”

“…19 Meanwhile, other SAPO zeolites, such as SAPO-20 (SOD topology), are small pore zeolites with a pore opening of 2.53 × 2.53 Å 2 , which are useful in selective removal of nitrogen oxides from exhaust gases, and separation of hydrogen gas from gas mixtures. 20,21…”

Improved CO2/N2 separation performance of Pebax-1074 blend membranes containing poly(ethylene glycol)

“…Previously, our team adopted NaY zeolites and SAPO-23 as additives to modify Pebax membranes that substantially improved the CO 2 permeability and CO 2 /N 2 selectivity to 131.8 Barrer and 178.1, respectively. 7 , 26 Unfortunately, the controllability of membrane fabrication is not satisfactory enough due to the inferior compatibility and dispersivity of inorganic fillers with the membrane matrix. 9 , 17 Besides, the introduction of inorganic fillers might also greatly weaken the flexibility and applicability of ultimate membranes.…”