A hybrid zeolitic imidazolate framework membrane by mixed-linker synthesis for efficient CO₂capture

Abstract

Fuchen Chemical Reagents Factory), potassium permanganate (KMnO 4 , Beijing Yongjia Boyuan Trading Co. Ltd.), potassium carbonate (K 2 CO 3 , ≥99%, Beijing Chemical Works). Porous α-Al 2 O 3 disks, (Angtai Electronic Ceramics Co. Ltd.) 30 mm in diameter, 3 mm in thickness, were used as supports. Modification of the support surface: Porous α-Al 2 O 3 disks were selected as the supports of membranes with the most probable pore size of ca. 160 nm and about 35% porosity. One side of the support was polished using 2000 grit SiC sandpaper to obtain a smoother surface for membrane growth, ultrasonically cleaned using abundant deionized water to clean off the impurities. 1,2 Then the α-Al 2 O 3 discs were soaked in saturated NaOH solution for 24 h to get rid of the oil of support surfaces and also increase the concentration of free hydroxyl groups. 3 After that the supports were ultrasonically dealt with abundant deionized water, then dried at 100 °C for 1 h. 4 The supports were then exposed to the vinyltrimethoxysilane (CH 2 =CH Si(OCH 3) 3 for 20 h, followed by rinsing with deionized water and drying. The terminating vinyl group of the vinyltrimethoxysilane self-assembled organic monolayer (SAM) was oxidized by immersing the supports into an aqueous solution (20 ml) of 0.002 g KMnO 4 , 0.084 g NaIO 4 and 0.007 g K 2 CO 3 according to the methods in literature. 5-7 After 20 h the supports were removed from the oxidation solution, rinsed with water and dried.

Modified Metal Organic Frameworks (MOFs)/Ionic Liquid Matrices for Efficient Charge Storage

“…Metal Organic Frameworks (MOFs) 1 or coordination polymers are of extreme interest due to several unique features and their applications in the fields of gas storage, 2,3 separation, 4 catalysis 5,6 and sensors 7 have been studied extensively as ionic conductors. [8][9][10][11][12] Apart from these properties, an extraordinary feature of MOFs which makes them more interesting is that the supramolecular design of MOFs allows easy tunability depending upon the organic ligands and metal centers giving a versatile desirable properties in synthesized matrices.…”

Synthesis of Zeolitic Imidazolate Framework Membrane Using Temperature-Switching Synthesis Strategy for Gas Separation

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 8 through membrane M1 are observed to be independent of the trans-membrane pressure drops as shown in Figure 3, further indicating the absence of macroscopic defects. 28,29 Figure 3 N 2 permeance measured in different trans-membrane pressure drops at room temperature.…”

“…The ideal separation factor of H 2 with respect to CO 2 , N 2 , and CH 4 was calculated as the ratio of their permeances. 29 To confirm the reliability of results, each measurement was repeated at least five times. The permeation (P per ) was calculated as follows: (1) where, V is the total volume of gas permeated in the soap film flowmeter, t is the operating time, R is the constant of 8.314 Pa·m 3 /(mol·K), T is the testing temperature, ∆P is the pressure drop, P 0 is the atmosphere pressure, and A is the membrane area.…”

Imidazolatsysteme zur CO2‐Abscheidung und photochemischen Reduktion

“…Vork urzem berichteten Zhang et al über die Herstellung einer hybriden ZIF-Membran (ZIF-9-67) auf einem a-Al 2 O 3 -Träger zur wirksamen CO 2 -Adsorption. [57] Die Membran wies eine hohe Gasdurchlässigkeit und gute Selektivität auf.D iese Studie offenbart das Potenzial von ZIFs zur Abscheidung und Abtrennung von CO 2 .…”