Zeolites separation science

The selective intercalation of guests into solid hosts offers the potential for application in catalysis and separation science. An excellent case in point is zeolites, which exhibit shape and size selective inclusion properties and are used for an enormous variety of processes [44,45]. Additionally, a munber of layered materials have been reported to possess selective intercalation properties, including layered metal phosphonates [46,47], montmorUlonite [48], magnesium aluminum oxide [49], and layered double hydroxides [50-59]. 

In addition to mesostructured metal oxide molecular sieves prepared through supramolecular assembly pathways, clays, carbon molecular sieves, porous polymers, sol-gel and imprinted materials, as well as self-assembled organic and other zeolite-like materials, have captured the attention of materials researchers around the globe. Clays, zeolites and sol-gel materials are still very popular because of their extensive and expanding applications in catalysis and separation science. Novel carbons and polymers of ordered porous structures have been synthesized. There are almost unlimited opportunities in the synthesis of new organic materials of desired structural and surface properties via self-assembly or imprinting procedures. 

The majority of the interest in liquid clathrates has centred around their potential applications in separation science, particularly in the separation of closely related species such as benzene and toluene, or xylene isomers (cf. zeolite-based methods, Section 9.2). Separation occurs as a result of the greater ability of one organic solvent over another to stabilise the liquid clathrate phase. Hence, in a... 

The very last example here refers to the, so-called, organic zeolites. There are several structures which belong to this class of inclusion compounds and their physicochemical properties are remarkable, being of particular interest to separation science. An example of crystal structure of the compounds is given in Fig. 11.10 [9]. 

Lai ZP, Bonilla G, Diaz I, Nery JG, Sujaoti K, Amat MA, Kokkoli E, Terasaki O, Thompson RW, Tsapatsis M, and Vlachos DG. Microstructural optimization of a zeolite membrane for organic vapor separation. Science 2003 300 456-460. 

Roque-MaUierbe R., del VaUe W., Marquez F., Duconge J., and Goosen M.F.A., S3mthesis and characterization of zeolite-based porous ceramic membranes. Separation Science and Technology 41 2006... 

D.M. Ruthven, Lecture Diffusion in zeolites. 4th International S)mposium European Science and Engineering Program on Advanced Separation Science and Engineering, 4-6 October 1994, Leuven, Belgium. 

Reiss G (1989) In Weitkamp J, Karge HG (eds) Zeolites as catalysts, sorhents and detergent builders - applications and innovations. Elsevier, Amsterdam, p 607. Stud Smf Sci Catal 46 Jasra RV, Bhat SGT (1988) Separation Science Technology 26 885 Keane Jr M, Sonnichsen GC, Abrams L, Corbin DR, Gier TE, Shannon RD (1987) Appl Catal... 

Lai Z, Bonilla G, Diaz I. Nery J G, Sujaoti K, Kokkoli E,Terasaki O,Thompson R W, Tsapatsis M and Vlachos D G (2003), Microstructiual Optimization of a Zeolite Membrane for Organic Vapour Separation , Science, 300,456 60. 

Varmli, J., and Degnan, T., )r. (2007) Applications of mesoporous molecular sieves in catalysis and separations, in Introduction to Zeolite Science and Practice, 3rd Revised edn (eds ). Cejka,... 

Sherman, J.D. (1984) Ion exchange separations with molecular sieve zeolites, in Zeolites Science and Technology (eds G. Ohhlmann, F.R. Ribeiro, A.E. Rodrigues, LD. Rollmann, C. Naccache), NATO Scientific Affairs Division/Martinus Nijhoff, The Hague, pp.583-623... 

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