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Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings Radostina Dragomirova and Sebastian Wohlrab Abstract: Literature on zeolite membranes in catalytic reactions is reviewed and categorized according to membrane location. From this perspective, the classification is as follows: (i) membranes spatially decoupled from the reaction zone; (ii) packed bed membrane reactors; (iii) catalytic membrane reactors and (iv) zeolite capsuled catalyst particles. Each of the resulting four chapters is subdivided by the kind of reactions performed. Over the whole sum of references, the advantage of zeolite membranes in catalytic reactions in terms of conversion, selectivity or yield is evident. Furthermore, zeolite membrane preparation, separation principles as well as basic considerations on membrane reactors are discussed. Reprinted from Catalysts. Cite as: Dragomirova, R.; Wohlrab, S. Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings. Catalysts 2015, 5, 2161–2222. 1. Introduction It is not possible to imagine industrial catalysis without zeolites. Over the years, zeolites gained that importance owing to their outstanding properties which are (i) high surface area; (ii) pore sizes in the molecular range; (iii) adsorption capacity; (iv) controllable adsorption properties; (v) inherent active sites; (vi) shape selectivity and (vii) stability [1,2]. Certainly, due to these unique features the application of zeolites is not only restricted to catalysis. Their potential to serve as highly selective sorption materials make zeolites also indispensable for industrial separation tasks [3]. Highlighting, separation and purification of gases [4], especially swing adsorption techniques [5–7], as well as water and waste water treatment [8,9] are also not imaginable without zeolitic materials. To run separation processes continuously and without recurring regeneration steps zeolite membranes have been developed and studied over the last decades [10–20]. With this development, the utilization of zeolite membranes was progressively investigated for catalytic reactions [21–32]. The special interest in membranes for catalysis science lies in the possibilities of equilibrium shifts, improved yields and selectivities as well as more compact operations compared to conventional processes. Nevertheless, no industrial commercialization of zeolite membrane reactors has been occurring until now. However, recent pioneering developments towards sub-μm membranes [33–38] or the reduction of defects [39–41] promise a revival of zeolite 4PDF Image | Zeolite Catalysis
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