Zeolite Membranes

Tavolaro, Adalgisa; Drioli, Enrico

doi:10.1002/(sici)1521-4095(199908)11:12<975::aid-adma975>3.0.co;2-0

Cited by 383 publications

(176 citation statements)

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“…It will not only cut the equipment and operation cost off, but also be operated continuously if the zeolites can be configured into a membrane form. Since 1990s, much effort has been paid in the synthesis of zeolite membrane [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Till now, different types of zeolite membranes, e.g.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and perfection evaluation of NaA zeolite membrane

Yang

Liu

et al. 2001

Separation and Purification Technology

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Section: Introductionmentioning

confidence: 99%

Synthesis and perfection evaluation of NaA zeolite membrane

Yang

Liu

et al. 2001

Separation and Purification Technology

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“…A variety of preparation and application methods of inorganic membranes have been reported. [4][5][6][7][8][9][10][11][12][13][14][15] Zeolites 4-8 and ceramics 9-14 are frequently used as sources of inorganic membranes. Zeolites are porous crystalline materials, which have a high surface area to volume ratio.…”

mentioning

confidence: 99%

Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

et al. 2006

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Separation membranes are used in many fields ranging from medical science to industry, and much effort has been devoted to the development of new membranes with high qualities. [1][2][3] Recently, inorganic membranes have attracted much attention because of their superior mechanical strength, thermal stability and resistance to organic solvents. A variety of preparation and application methods of inorganic membranes have been reported. [4][5][6][7][8][9][10][11][12][13][14][15] Zeolites 4-8 and ceramics 9-14 are frequently used as sources of inorganic membranes. Zeolites are porous crystalline materials, which have a high surface area to volume ratio. Membranes made of zeolites are used for catalysts, 5 pervaporation 6,7 and high temperature separation of hydrocarbon isomer vapors. 8 Ceramics such as alumina are hard and heat-resistant materials made with nonmetallic minerals, and ceramic membranes for gas separation 13 and catalysts 14 have been synthesized.Mesoporous silica has also been adopted as a source material in the synthesis of inorganic membranes. 9,15 Mesoporous silica is an ordered material that has three different mesophases: lamellar, cubic and hexagonal. 16,17 In particular, the hexagonal mesophase possesses highly regular arrays of uniform-sized channels whose diameters are in the approximate range of 1 to over 10 nm depending on the surfactants and reaction parameters. Because of its porosity, high surface area, ordered pore arrangement and pore size uniformity, mesoporous silica has been the subject of many theoretical and applied studies. 18 For practical applications, the morphology of mesoporous silica is very important. The film is an ideal morphology for separation membranes, sensor 19,20 and optics. 21,22 Usually, mesoporous silica films are prepared on a flat substrate by dipor spin-coating methods. [23][24][25] However, in the case of hexagonal mesoporous silica, the channels are aligned parallel to the substrate surface, and transport of molecules across the film is not possible. In order to achieve separation, straight channels should be oriented perpendicular to the surface to transport molecules across the film. To solve this problem, instead of hexagonal mesoporous silica, some researchers have used cubic mesoporous silica to synthesize the inorganic membrane. 15,19 Recently, a porous anodic alumina membrane with a perpendicularly oriented silica-surfactant nanochannel assembly membrane (NAM) was synthesized. 26 The porous anodic alumina membrane has a packed array of columnar pores ranging from tens to hundreds of nanometers in diameter, and the channel direction of the columnar pores is perpendicular to the membrane.When a precursor solution containing cetyltrimethylammonium bromide (CTAB) surfactant and tetraethyl orthosilicate (TEOS) as a silica source is introduced into the alumina pores, highly ordered hexagonally arranged silica-surfactant nanochannels with pores of 3.4 nm diameter are assembled inside the alumina pores. The channel direction of mesoporous silica is predomi...

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“…In the past few decades, zeolite membrane has gained more and more interest due to its potential utility in separation and catalysis [1][2][3][4][5]. Usually, the methods to synthesize zeolite membranes include in situ hydrothermal synthesis [6][7][8][9], vapor phase hydrothermal synthesis [10,11], and embedding zeolite crystals into a matrix [12,13].…”

Section: Introductionmentioning

confidence: 99%